Lutnes infucatus, Gibson, 2018

Gibson, Gary A. P., 2018, Revision of Lutnes Cameron (Hymenoptera: Eupelmidae), Zootaxa 4415 (2), pp. 330-356 : 345-347

Lutnes infucatus n. sp.

Figs 28–36

Type material. Holotype ♀ ( USNM). ECUADOR: NAPO Res. Ethnica | Waorani, 1km S. Onkone Gare | Camp , Trans.Ent . 7 Oct. 1994 | 220m 00°39'10"S 076°26'W | T.L. Erwin et al. / Insecticidal fogging of mostly bare | green leaves, some with covering | of lichenous or bryophytic plants in | terre firme forest At Trans 7, | Sta. 9 Project MAXUS Lot 898 / HOLOTYPE ♀ | Lutnes infucatus | Gibson . Holotype point-mounted; entire; uncontorted ( Figs 28, 29 ).

Etymology. From the Latin word infucatus (painted), in reference to the more uniformly infuscate fore wings of females, which uniquely lack hyaline regions with white setae behind the marginal vein.

Description. FEMALE (habitus: Figs 28, 29 ). Length about 4.4 mm. Head ( Figs 28–30 ) mostly violaceous to purple, but following green: about posterior half of vertex, occiput, gena, lower face variably extensively under different angles of light, and obscurely along lateral margins of interantennal prominence. Head in lateral view ( Fig. 29 ) low-lenticular, about 1.7× as high as long, with frontal surface almost uniformly convex; malar space about 0.47× eye height. Head in frontal view ( Fig. 30 ) without differentiated ocellocular line between posterior ocellus and inner orbit; mostly punctate-reticulate except as follows: interantennal prominence coriaceous to coriaceous-granular over about ventral half but narrowly punctate-reticulate along lateral margins and partly transversely imbricate or roughened over about dorsal half, and scrobal depression with scrobes more transversely reticulate-strigose; with whitish-translucent, lanceolate setae on interantennal prominence, lower face below toruli, clypeus, and lower parascrobal region to about level of dorsal margin of torulus, but with longer, dark brown, hairlike setae on lower face below lanceolate setae lateral of clypeus and long, white, hairlike setae on parascrobal region above lanceolate setae to about level of interocellar triangle, but vertex mostly with dark hairlike setae; scrobal depression bell-shaped, higher than wide, extending dorsally to within slightly less than one ocellar diameter from anterior ocellus, with dorsal margin below ocellus not carinately margined, and carinate lateral margin obviously recurved toward lower inner orbit lateral to torulus; interorbital distance about 0.37× head width; ratio of OOL: POL: LOL: MPOD = 15: 34: 18: 12. Labiomaxillary complex yellowish. Eye comparatively inconspicuously setose ( Fig. 30 ); about 1.32× as high as long; height about 1.5× and length subequal to interocular distance, respectively. Antenna ( Fig. 33 ) with scape broadened apically but more or less cylindrical and slightly curved, mostly yellowish but about dorsoapical half brownish, pedicel and fl1 brown, funicle mostly yellowish but fl2–fl4 brownish ventrally, and clava brown except tip paler; fl1 with dorsal (shortest) length subequal to width, but appearing somewhat longer than wide because ventral margin longer, with dorsal length 0.44× dorsal length of pedicel and 0.37× dorsal length of fl2; fl2 the longest funicular, about 2.5× as long as wide and subsequent funiculars gradually decreasing in length such that fl5 and fl6 slightly longer than wide and fl7 and fl8 subquadrate; clava about 2.4× as long as wide and about as long as combined length of fl8 + fl7 + about apical one-quarter of fl6.

Mesosoma ( Figs 28, 29 ) dark brown without evident metallic luster except for obscure bluish tinge on scutellar-axillar complex under some angles of light. Pronotum partly overlain by posterior of head, but posteriorly with line of dark hairlike setae ( Fig. 32 ); propleuron and prosternum with short white setae. Mesoscutum ( Fig. 31 ) reticulate-rugulose to somewhat longitudinally reticulate-strigose except lateral flange faintly coriaceous, with lateral lobe longitudinally carinate over about posterior half; quite densely setose with brown hairlike setae ( Figs 31, 32 ). Scutellar-axillar complex ( Fig. 31 ) similarly sculptured and setose as mesoscutum except more distinctly longitudinally reticulate-strigose. Prepectus ( Fig. 32 ) bare, subdivided by distinct vertical line slightly before midlength. Mesopleurosternum with white hairlike setae more ventrally on mesopectus and on acropleuron anteriorly, but dorsally below tegula with dark brown hairlike setae ( Fig. 32 ); acropleuron partly concealed by middle legs but extensively meshlike reticulate except more finely, longitudinally reticulate-strigose mesally. Brachypterous ( Figs 28, 29 ), with fore wing extending only to about apex of Gt3 but otherwise not conspicuously modified, the length about 2.75× maximum discal width and basal region about 0.8× length of discal region ( Fig. 34 ). Fore wing ( Fig. 34 ) with normal venation, the ratio of cc: mv: stv: pmv about 12.5: 5.3: 1.0: 2.5 (lengths approximate); costal cell dorsally with dark brown hairlike setae, the setae in two rows basally but reduced to single row over about apical half; basal cell slightly infuscate and uniformly covered with similarly long dark brown hairlike setae except setae paler and somewhat shorter behind mv apically; discal region more strongly infuscate than basal cell except for slightly paler region behind about apical half of mv, but paler region and mv with entirely dark brown setae, the setae lanceolate basally but gradually becoming more slender apically so as to be hairlike beyond about level of stv.

Legs ( Fig. 29 ) similarly dark brown as mesosoma except middle leg with knee and basal four tarsomeres and metafemur ventroapically somewhat paler, yellowish-brown; protibia only obscurely concave anteroapically and mesotibia dorsally not carinate. Propodeum ( Fig. 35 ) with medial length almost 0.25× length of scutellum; with quite deep and distinct furrows along foramen extending anteriorly on either side of midline to delineate median carina over most of length, and with anterior margin broadly v-like emarginate but not incised anteromedially; callar region meshlike coriaceous-reticulate mesal to postspiracular groove and smooth and shiny lateral of groove except along lateral margin within setose region.

Gaster ( Figs 28, 29 ) dorsally dark brown except dorsal surface of Gt1 slightly paler, yellowish-brown in part; ventrally white except apical two sternites and posterior margin of previous sternite brown; Gt1 dorsally smooth and shiny, Gt2 faintly meshlike coriaceous and subsequent tergites more distinctly meshlike reticulate except for syntergum ( Figs 28, 36 ); Gt1 and Gt2 bare, but subsequent tergites extensively covered by dark hairlike setae; syntergum slightly shorter than though similar in size to Gt6 and not distinctly transverse ( Figs 28, 36 ).

Distribution. Neotropical: Ecuador.

Remarks. The absence of distinct hyaline regions with white setae from the fore wings ( Fig. 34 ) differentiates females of L. infucatus from those of other Lutnes species. The fore wings of the other four New World species have variably developed posterior and/or hyaline regions behind the marginal vein apically as well as more distinctly white setae apically in the basal cell that are continuous with pale setae posterobasally on the disc beyond the basal fold behind the medial fold.

Figures

FIGURES 28–36. Lutnes infucatus n. sp., ♀ (HT): 28, dorsal habitus; 29, lateral habitus; 30, head, frontal; 31, mesosoma, dorsolateral; 32, vertex and anterior of mesosoma, lateral; 33, antenna; 34, fore wing; 35, propodeum; 36, gastral apex, dorsolateral.