Morphological characteristics.

Head (Fig. ​(Fig.3):3): Width 1.6 mm (including eyes); ratio of head width to eye width = 3.0 : 1. Vertex raised, round; surface pitted anteriorly, with few or no setae, lacking prominent posterior fold. Distance between scapes 0.09 mm; distance between tentorial pits 0.36 mm; length of frons (midway between scapes – midway between tentorial pits) 0.33 mm. Frons relatively wide, with broad longitudinal ridge mesally; surface smooth, shiny, slightly rounded below toruli and at insertion of mouthparts; margin above clypeus straight. Clypeus tapering, with rounded sculpturing basally, indented mesally, slightly expanded distally, with distal margin straight to slightly convex; dorsal surface shiny, smooth, sculptured. Labrum about same width as clypeal margin, with small longitudinal ridge mesally; dorsal surface sculptured, shiny; distal margin bilobed, bearing numerous long setae distally. Antenna 9.7–9.8 mm long (~0.5× length of forewing); scape shorter than wide (0.23 mm long, 0.33 mm wide), lateral margin straight, mesal margin strongly convex, surface with short setae throughout; pedicel 0.17 mm long, 0.13 mm wide, with numerous short setae; flagellum with basal flagellomeres distinct, somewhat elongate (0.12–0.14 mm long, 0.07–0.08 mm wide), midantennal flagellomeres twice as long as broad (0.15 mm long, 0.07 mm wide), basal two flagellomeres with 4–5 partially indistinct whorls of thickset brown setae extending distally, third flagellomere and others distally all with five distinct whorls of thickset, brown setae extending distally, 0.3–0.5× width of flagellomere, distal whorl with one or two slender, elongate (~0.75× width of flagellomere), pale setae extending laterally.

Head coloration: Scape cream, with reddish spot on distolateral tip; pedicel, flagellum cream, unmarked; thickset setae in whorls mostly brown, elongate setae pale. Vertex cream, possibly tinged red laterally; dorsal torulus yellow to cream, apparently unmarked. Frons cream, probably with reddish tinge laterally below torulus; torulus cream, unmarked. Clypeus cream, possibly tinged red laterally; basal, distal margins straight. Genal mark dark red/brown throughout, extending to tentorial pit. Labrum probably cream. Palpomeres probably mostly cream, somewhat darkened distally.

Thorax (Fig. ​(Fig.4):4): Cervix not visible. Dorsal thoracic surface with pale longitudinal stripe mesally, probably with broad reddish or brownish stripes or coloration laterally. Prothorax broad, 0.9 mm long, 1.5 mm wide, ratio of length to width = 0.63 : 1; pronotum well sclerotized, with textured surface, transverse fold mesally, few or no setae. Legs elongate, slender, probably cream, unmarked, lacking prominent tibial spurs. Tarsus with basal three tarsomeres appearing coalesced, bearing spurs, setae intermixed along undersurface; middle three tarsomeres with expanded lateral lobes bearing spurs, setae in irregular rows; distal tarsomere narrow basally, enlarged distally, bearing numerous elongate, slender, dark setae laterally, distally, terminus bearing pair of claws laterally, large pad mesally; claw amber, with basal enlargement, acute slender hook terminally.

Wings (Figs ​(Figs1,1, ​,2,2, ​,5):5): Forewing 18.5 mm long, 6.5 mm wide (at widest point); ratio of length to maximum width = 2.9 : 1. Membrane clear, lacking markings; microtrichia present below base of every major vein, pale. Trichosors (sensu Makarkin and Archibald 2013: 140–142) absent. Costal area relatively enlarged; tallest costal cell (7^th from base of wing) 1.8 mm tall, 2.7× width of cell, 0.28× height of wing; costal crossveins simple, six before 1sc-r, twelve after 1sc-r and before stigma, one (very small) after stigma, none within stigma. Sc extending into stigma, fading but not appearing to merge with C or RA; no crossveins in stigma; first sc-r crossvein slightly distal to Rf, slightly basal to Mf; RA with one very short veinlet extending to wing margin after stigma. Radial area between RA and RP with single row of ten closed cells; tallest cell (3^rd from base of wing) 0.6× as tall as wide. Intramedian cell (im1 = mamp1) prominent, elongate, triangular, formed by MA, crossvein 1ma-mp, and two abscissae of MP, occupying approximately half the space between MA and CuA, with Mf broadly acute, long sides (MA, MP) roughly parallel for most of span; crossvein 2m-cu proximal to midpoint of im1. Three medial cells present (mcu, mcua, mpcua), second, third of these elongate, with roughly parallel sides; MP merging into Psc well beyond im1. Two series of gradate veins parallel basally, diverging slightly medially, converging distally. Approximately nine inner gradates in regular, sinuous series, continuing from Psm in zigzag pattern across center of wing; approximately ten outer gradates continuing from Psc in regular, upturned series. RP with nine marginal forks beyond Psc. Cu furcated after m-cu crossvein, with two closed, four open icu cells. CuA with three furcations before meeting MP; CuP furcated below icu2; thus cubital trace having five terminal veinlets (three from CuA, two from CuP). A1, A2, A3 simple, unforked; a1-a2 and a2-a3 crossveins present; distal part of a3 and jugal lobe with dense patch of microtrichia. Jugal lobe large, quadrate, folded beneath third anal cell, without internal vein; margin bearing long, slender setae basally.

Nothochrysaehrenbergi sp. nov. (Ñuble, Chile; Male, CAS): Wings, color slightly enhanced to emphasize pattern of vein markings (a) forewing (b) hindwing.

Hindwing: 12.4 mm long, 4.2 mm wide. Costal area not enlarged; at least 15 c-sc crossveins before stigma, none within or after stigma. Radial area containing single row of eleven closed cells between RA and RP. Gradate veins in two roughly parallel series, slightly divergent distally; approximately seven inner gradates beyond Psm; approximately 11 outer gradates beyond Psc. Psc with nine marginal forks. MA aligned with RP for approximately one-third length of im1. CuA with two furcations before meeting MP; CuP undivided; thus, wing margin having three cubital veinlets (two from CuA, one from CuP). A1, A2, A3 simple, unforked; a1-a2 and a2-a3 crossveins present. Jugal lobe without internal vein, basal margin bearing long, slender setae.

Coloration of forewing, hindwing (Fig. ​(Fig.5):5): Membrane clear, somewhat glossy. Stigma slightly opaque, without coloration. Costal, subcostal, radial veins brownish; all other longitudinal veins pale with black marks at intersections and (forewing) at bases of setae. Forewing with posterior veinlets extensively marked black; basal inner gradates pale, others becoming increasingly marked black until entirely black distally; outer gradates mostly black. Hindwing with basal inner gradates pale, marked with black at intersections; outer gradates mostly black.

Abdomen (Male, Fig. ​Fig.6;6; female unknown): Sclerites, integument of pleural region somewhat soft, flexible; tergites, sternites, pleural region covered with setae of uniformly short length; microsetae present, no microtholi. T6: length 0.78 mm, ~1.8× height; T7: length 0.80 mm, ~1.6× height; S6: length 0.67 mm, 0.72× height; S7: length 0.68 mm, ~0.70× height. Tergites roughly rectangular, edges acute or slightly rounded, ventral margins straight or slightly concave mesally. Spiracles located approximately in center of lateral membrane, roughly circular externally, not enlarged; atria slightly enlarged, rounded, with bifurcated tracheae. Coloration: body somewhat discolored; setae pale. Tergites probably green, without markings; pleuron mostly tan; sternites with green longitudinal stripe dorsally, tan ventrally; callus cerci white.

Nothochrysaehrenbergi sp. nov. (Ñuble, Chile; Male, CAS): Abdomen, cleared (a) midsection-terminus, lateral (b) T8 (distal), T9, and ectoproct, lateral (c) terminal abdominal segments, lateral (d) terminal abdominal segments, ventral. apo dorsal apodeme extending below T8 cc callus cerci ect ectoproct k distal knob extending from S8+9 sr spiracle S4, S7 fourth, seventh strenites S8, S9 partially coalesced eighth and ninth sternites T7, T8, T9 seventh, eighth, ninth tergites.

Male terminalia (Fig. ​(Fig.7):7): T8 broadly wedge shaped, with dorsal surface slightly rounded, length 0.83 mm, height 0.49 mm, considerably longer than dorsal surfaces of either T9 or ectoproct; lateral margins tapering inward ventrally, ventral margin roughly straight. T9 and ectoproct separate, not fused; callus cerci ovate, protruding basally from posterior margin of ectoproct, 0.18 mm length, 0.10 mm width, with ~30 trichobothria of various lengths. T9 rectangular, with distoventral margin rounded; elongate, lightly sclerotized ventral apodeme along ventral margin, extending proximally to midsection of A8. Ectoproct dome shaped, rounded distally, slightly convex basally, tightly curved ventrally, sloping dorsally; callus cerci situated on lower proximal margin. S8 and S9 partially fused, without internal ridge; S9 more heavily sclerotized than S8, posterior margin slightly more sclerotized than remainder of sternite. S8+9 (lateral view) with proximal margin straight ventrally, becoming broadly rounded dorsally, distal margin short, straight, ventral margin straight; terminal knob extending well beyond edge of S9, with elongate setae on ventral margin; dorsal surface of knob contiguous with heavy recurrent membrane attached to elongate gonarcal membrane. Subanal plate not found.

Gonarcus delicate, slender, broadly arcuate; lateral apodemes slender, quadrate (lateral view), rounded distally, with short, contiguous processes mesally, extending forward. Mediuncus closely attached to dorsal surface of gonarcal arch, flat, recurved into an almost fully circular hood, with two internal sclerotized “rods” extending roughly in parallel from mediuncal base to tip, converging slightly at tip; base of mediuncus quadrate (dorsal view), occupying approximately one-fourth span of gonarcal bridge; terminus of mediuncus with expanded lateral wings, rounded mesal protrusion. Gonosaccus transparent, immediately beneath gonarcal arch and mediuncus, with approximately 32 short setae on distinct setal bases uniformly distributed in two equal patches. Hypandrium internum small, located on delicate membrane extending well below gonosaccus, consisting of paired, curved lateral arms meeting mesally at narrow, rounded apex; comes lightly sclerotized, extending forward beyond apex. Gonapsis, gonocristae absent.