Descriptions of two new genera of Maruinini (Diptera, Psychodidae, Psychodinae) from the Mitaraka range of French Guiana Author Curler, Gregory Mississippi Entomological Museum, Mississippi State University, Old Highway 12, P. O. Drawer 9775, Mississippi State, MS 39762 - 9775 (USA) Collaborator, Smithsonian Institution, National Museum of Natural History; 10 & Constitution NW, Washington, DC 20560 - 0169 (USA) gcurler @ gmail. com gcurler@gmail.com text Zoosystema 2020 2020-04-07 42 10 139 149 journal article 10.5252/zoosystema2020v42a10 60ca36d6-4c1f-4050-88e2-38e8b28f3f5c 1638-9387 3743146 urn:lsid:zoobank.org:pub:21B9187A-D055-4946-8922-53FD10A159CE Myiomystax trilineata n. gen., n. sp. ( Figs 3 ; 4 ; 5B ) urn:lsid:zoobank.org:act: 4BF6B1A7-8DED-4AFA-9184-A51145B25143 TYPE LOCALITY. — Guyane , Mitaraka. TYPE MATERIAL. — Holotype . French Guiana • ♂ ; Mitaraka , site MIT-C-RBF2; 02°14’03.4”N , 54°26’53.0”W ; 29 m a.s.l. ; lowland rainforest; 27.II-6.III.2015 ; YPT ; Marc Pollet leg. (sample code: MITARAKA/125); specimen dissected, mounted on slide; MNHN . Paratypes . French Guiana • 1 ♀ ; site MIT-C-RBF2; 02°14’03.4”N , 54°26’53.0”W ; 29 m a.s.l. ; lowland rainforest; 27.II.2015 ; Marc Pollet leg. (sample code: MITARAKA/018); SW ; LACM 340595 • 4 ♂ , 2 ♀ ; same data as holotype; YPT ; MNHN ( 2 ♂ , 1 ♀ ), LACM ( 2 ♂ LACM 340603-340604 , 1 ♀ LACM 340605 ) • 1 ♂ , 2 ♀ ; site MIT-C-RBF1; 02°14’10.8”N , 54°26’49.5”W ; 25 m a.s.l. ; lowland rainforest; 27.II-8.III.2015 ; Marc Pollet leg. (sample code: MITARAKA/133); YPT ; MNHN ( ♂ , 1 ♀ ), LACM ( 1 ♀ LACM 340606 ) • 9 ♂ , 5 ♀ ; site MIT-C-RBF2; 02°14’03.4”N , 54°26’53.0”W ; 29 m a.s.l.; lowland rainforest; 6-10. III.2015 ; Marc Pollet leg. (sample code: MITARAKA/136); YPT ; MNHN ( 4 ♂ , 3 ♀ ), LACM ( 5 ♂ LACM 340607-340611 , 2 ♀ LACM 340612-340613 ) • 1 ♀ ; site MIT-C-RBF2; 02°14’03.4”N , 54°26’53.0”W ; 29 m a.s.l. ; tropical wet forest (bas fond); 27.II-2. III.2015 ; Marc Pollet leg. (sample code: MITARAKA/184); SLAM ; MNHN • 1 ♀ ; site different sites near base camp and along trails; 14.III.2015 ; Julien Touroult & Eddy Poirier leg. (sample code: MITARAKA/191); SLAM ; MNHN . ETYMOLOGY. — The specific epithet is derived form the Latin word “linea”, meaning line, in reference to the three darkly pigmented wing veins present in this species. DIAGNOSIS. — See above, Myiomystax n. gen. DISTRIBUTION. — Currently known from multiple localities in the Mitaraka range of French Guiana . HABITAT. — Little information regarding specific habitat is available; however, all specimens were collected in lowland rainforest. DESCRIPTION Male Measurements, (N = 4) head width 0.41 mm (0.38-0.44), head height 0.47 mm (0.44-0.48), wing length 2.17 mm (2.08- 2.24), wing width 0.54 mm (0.52-0.56). Head with vertex extended slightly posteriorly, eyebridge comprised of 3 facet rows, contiguous but strongly constricted at median. Frons and clypeus distinctly divided; frontal scar patch bilobed posteriorly, contiguous medially; clypeus elongated laterally, with lateral margins overlapping medial margins of eyes. Antennae: scape cylindrical, about 2.5 times longer than wide; pedicel globular; flagellomeres 1-5 elongate, cylindrical; flagellomeres 6-11 fusiform; flagellomeres 12-14 reduced, bead-like; flagellomere 14 with apical process digitiform, setose, approximately as long as node; all flagellomeres lacking ascoids. Mouthparts extending slightly beyond base of palp segment 1; labellum about as wide as anterior margin of clypeus; palpi conspicuously elongate, with segment 1 hook-like; segment 2 clavate, inflating from base to apex; segment 3 elongate, inflated at midlength; segment 4 inflated apically, capitate; palp segments with clusters of spatulate setae inserted dorsally and ventrally; palps folded behind head at rest. Wing: strongly lanceolate; radial fork positioned slightly distal to apex of CuA; medial fork positioned at the level of apex of CuA; R 5 terminating in C posterior to wing apex; wing veins R 1 , R 5 and M 4 pigmented brown, appearing more heavily sclerotized than other wing veins ( Fig. 5B ); costal vein with light pigment between apices of R 1 and R 3 , M 1 and M 4 ; pigmented veins contrasting against other lightly colored wing veins. Male terminalia: bilaterally symmetrical; hypandrium flat, band-like, arched posteriorly, fused with gonocoxites laterally; intersegmental membrane connecting between anterior margin of hypandrium and posterior margin of abdominal segment 8, covering base of ejaculatory apodeme; ejaculatory apodeme dorsoventrally compressed anterolaterally, dome-like at center, articulating ventrally with gonocoxal apodemes, posteriorly with aedeagal sclerites; aedeagus comprised of paired, laterally compressed sclerites, spatulate in lateral view; spatulate sclerites enveloped by tubular membrane; parameres not differentiated from aedeagus; gonostyli tapered, sinuous from base to apex ( Fig. 3D ), digitiform apically, setose, with paired, elongate setae inserted medially near apex ( Figs 3D ; 4A ); gonocoxites glabrous, without setae alveoli ( Figs 3D ; 4A ), cylindrical, about two times as long as wide; gonocoxal apodemes inflated, rounded in dorsoventral view, bulbous in lateral view, linked to subepandrial sclerite anteromedially; subepandrial sclerite narrow, divided medially, with puckered seam at median, with posterolateral arms ribbon-like, linked to base of epandrial claspers; epandrium rectangular along posterior half in dorsoventral view, anterior half narrowing abruptly; epandrial claspers elongate, tapered, curved dorsally from base to apex, with single, spatulate tenaculum inserted dorsoapically. Female Measurements, (N = 4) head width 0.44 mm (0.42-0.46), head height 0.41 mm (0.40-0.42), wing length 2.16 mm (2.04-2.36), wing width 0.53 mm (0.52-0.56). Head mostly as in male. Antennae with flagellomeres 1 and 2 elongate, cylindrical, shorter than in male; apical flagellomeres missing in specimens observed. Mouthparts as in male; maxillary palpi more typical of Psychodinae , segments not elongated; palp segment proportions: 1, 1.30, 1, 2.30. Wing venation as in male. Terminalia: cerci conical in ventral view, with ventral surface covered by setulae, numerous setae inserted laterally and ventrally; posterior margin of sternum 8 trilobed, with median lobe wider than flanking lobes; oviduct with microtrichia internally on membrane.