Isoneuromyia yorki Evenhuis

Evenhuis, Neal L., 2006, New species of Isoneuromyia Brunetti (Diptera: Keroplatidae) from the Oriental Region, Zootaxa 1140, pp. 1-29 : 22-23

Isoneuromyia yorki Evenhuis , n. sp.

( Figs. 2 , 10 , 19 , 26 , 43)

Diagnosis

Similar to the Indian species grandis but can be distinguished from it by the yellow palpi (brown in grandis) and the yellow fore coxa (brown basally in grandis).

Description

MALE. Lengths: Body: 5.0– 6.5 mm; wing; 4.2–5.5 mm.

Head ( Fig. 2 ). Vertex and occiput black, with small recumbent black hairs. Ocelli in horizontal line. Frons black, bare. Antennae brown. Face yellow with brown transverse band medially, silvery pruinose with small black hairs apically. Palpi yellow. Proboscis orange.

Thorax. Mesonotum ( Fig. 19 ) dark brown. Scutellum reddish brown to pale brown. Mesonotum with yellow tomentum dorsally, small recumbent black hairs posteriorly, patch of thick black setae above wing root, on postalar calli, and on posterior margin of scutellum. Prescutellar area tapering to scutellum. Pronotal lobes dark brown with black setae laterally. Pleura and mediotergite dark brown, bare. Halter orange with dark brown along edge of knob.

Legs. Coxae yellowish orange with black hairs. Mid and hind coxae with spot of black color apically. Fore and mid femora yellow, hind femur black basally, all femora with fairly dense recumbent black hairs. Fore tibia with brownish orange tibial pecten apically. Tibial spurs black. Fore basitarsus 1.2 x length of fore tibia. Mid and hind basitarsi subequal in length to lengths of respective tibiae. Claws minute.

Wing ( Fig. 26 ). Subhyaline; with brown infuscation subapically from costa into apex of cell r4, fading posteriorly; vein R4 slightly curved upward, ending in C slightly beyond end of R1; veins M2, CuA1, CuA2, and A1 not reaching wing margin.

Abdomen. Tergites I–II black with dense recumbent black hairs; tergite III black with yellow color basally, predominantly black tomentose; tergites IV–VIII predominantly yellowish orange with black tomentum, tomentum becoming sparser on posterior segments.

Hypopygium (Fig. 43). Gonocoxites grayish brown. Gonostyli subtriangular in shape, dark brown, with stiff black setae, apex darkly sclerotized with two black teeth fused into a single bifid tooth.

FEMALE. As in male except for generally paler brown coloration of occiput, mesonotum and abdomen. The cerci ( Fig. 10 ) are small and barely exserted from the terminal abdominal segments.

Types

Holotype ♂ (16,601) and paratype Ψ from: VIETNAM: 6 km S Dalat, 1400–1500 m, 9 Ju–n 7 Jul 1961, N.R. Spencer. Other paratypes: VIETNAM: 3♂, Fyan, 900–1000 m, 11 Jul–9 Aug 1961, N.R. Spencer. Holotype and paratypes in BPBM.

Figures

FIGURES 1 – 6. 1 – 2. Isoneuromyia heads, lateral view, showing general shapes, antennal flagellomeres and vestiture removed. 1. I. splendida, n. sp. 2. I. yorki, n. sp. 3 – 6. Isoneuromyia antennae, lateral view. 3. I. nigerrima, n. sp. 4. I. splendida, n. sp. 5. I. polybioides (Edwards). 6. I. glabra, n. sp.

FIGURES 7 – 10. 7. Isoneuromyia splendida, n. sp., thorax, lateral view, vestiture removed. 8. Isoneuromyia variabilis, n. sp., apex of fore tibia showing tibial pecten in association with tibial spur. 9 – 10. Isoneuromyia female terminal abdominal segments, showing relative lengths of cerci. 9. I brunettii, n. sp. 10. I. yorki, n. sp.

FIGURES 11 – 19. Isoneuromyia thoraces, dorsal view. 11. I. brunettii, n. sp. 12. I. flava, n. sp. 13. I. glabra, n. sp. 14. I. matilei, n. sp. 15. I. nigribasis, n. sp. 16. I. pallidopsis, n. sp. 17. I. splendida, n. sp. 18. I. xanthina (Edwards). 19. I. yorki, n. sp.

FIGURES 20 – 26. Isoneuromyia wings, showing apical patterning. 20. I. splendida, n. sp. 21. I. subapicalis, n. sp. 22. I. nigribasis, n. sp. 23. I. glabra, n. sp. 24. I. nigerrima, n. sp. 25. I. jata, n. sp. 26. I. yorki, n. sp.