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UAITKD STATEi> XATIOXAL MUSEUM BULLETIN 2 63 



paler thiiii tlie latter, wiiitish tuineiituse, willi disliucl 

 orbits which are same width tliroughout the entire 

 Iciisrth; aiiteimal grooves well defined and moderate in 

 depth, their intenuediale portion flat and slightly 

 concave. Back of head (pi. 13, fig. 1) moderately swollen, 

 light brownish yellow, with one \miv of blackish lai'ge 

 subtriangular lateral spots just above the occipital 

 foramen, furnished with some black pubescence on the 

 inferior half; cheeks rather low, with a very shallow 

 genal groove, one row of blackish short bristly hairs 

 along the inferior margin which extend to above vii)ris- 

 sal angle. Antenna light yellow witli dorsal margin 

 more or less brown, shorter than face; second segment 

 whitish, with a conspicuous blackish median bristle, 

 one row of blackish setae along the apical margin; third 

 segment rather broad with rounded ape.x, fully twice as 

 long as wide; arista black and short pubescent. Palpi 

 (l)l. 13, fig. 4) very luirrdw with very long bristly hairs. 

 All bristles blackish brnwn or reddish brown: fronto- 

 orbitals 2:3, the lower superior thickest and longest; 

 ocellars as long as n])])er superior, not divergent but 

 parallel; jjostverticals rather weak, parallel; iimer verti- 

 cals strong, not divergent, tlie outer strongly directed 

 outward, one bristle (inner occipital) as long as post- 

 verticals between the postverticals and the outer 

 verticals; genal bristle distinct. 



Thorax distinctly longer than wide, dirty yellow, 

 the dorsum faii'ly tomentose. Mesonotum (pi. 13, fig. 5) 

 as long as wide, covered with a black mimite oblique 

 pubescence, with three blackish broad longitudinal 

 streaks, the median one complete and extending from 

 anterior to posterior margins, broadened behind and 

 ])aler, the lateral pair interrupted at sutures and ending 

 posteriorly at inner post-alar bristle, but enth'e, with a 

 very narrow stripe at inside and more or less connected 

 witli median in the middle of the metazona; humeral 

 callus rather small, ivory yellow, this color extending to 

 wing-base along superior margin of pleura; notopleural 

 calli brownish; scutellum somewhat triangular with 

 rather flat disk and with nearly perpendicular marginal 

 borders, ivory yellow. Pleura (pi. 13, fig. 6) nearly as 

 high as long, covered with a very sparse blackish minute 

 pubescence, more or less shining. All bristles brownish 

 black, rather long: Scapulars two pairs, very weak and 

 short; humerals situated at about middle; nofopleurals 

 2; presuturals 1; dorsocentrals situated just before 

 the level of anterior supra-alars; supra-alars 1:2, 

 another short but distinct bristle just inside the wing- 

 base; i)rescutellars situated on level of inner post-alar 

 bristles, in one specimen there is one pair of long dis- 

 tinct bristles between dorsocentrals and inner post-alars; 

 scutellars two pairs, the apical pan- directed inward 



or distinctly crossed; mesopleurals 2, pteroplcural 1, 

 sternopleuial 1, all directed posteriorly. 



Abdomen as long as thorax, l)roader than the latter, 

 yellowish, whitish tomentose, blackish ])ubescent, third 

 to lii'lh terga each witii lu'ownish-black basal band 

 occupying entire lateral surface, piceous in one sjieci- 

 men (third tergum light castaneous), terga (except the 

 first) each with a very narrow yellowish posterior 

 margin; genitalia brownish yellow, dorsal appendage 

 with long hairs at apex and ventral apjiendage narrow 

 and somewhat pointed. 



Wings (pi. 13, fig. 7) comparatively large, blackish 

 brown, apical third of apex of Ri darker than elsewhere, 

 hyaline spots as shown in figure; costal spine very short, 

 nearly as long as costal bristles, one bristle on first sec- 

 tion of costa conspicuously long; pterostigma nearly 

 2/3 as long as second costal cell; R5 nearly same width 

 throughout; anal cell with a very long pointed inferior 

 prolongation; R4+5 nearly straight, bristled to a little 

 beyond middle of R5. Halteres small, dirty yellow or 

 light brownish yellow. 



Legs light brownish yellow, blackish or brownish 

 pubescent. Forelegs (pi. 13, fig. 8) shortest; femur with 

 5-7 long blackish bristles on externoventral nnirgin, 

 several short ones on apical half of externodorsal 

 surface; tibia distinctly shorter than femur; tarsi as 

 long as tibia, first segment a little shorter than following 

 four segments together, the light j-ellowish brushlike 

 bristly hairs on internoventral surface rather sparse. 

 Midlegs (pi. 13, fig. 9) longest; femur as long as tibia, 

 which has one black apical spur and a few short bristles 

 along apical margin; tarsi conspicuously shorter than 

 tibia, dorsal surface furnished with rather long pubes- 

 cence, first segment longer than the following four 

 segments together, with rather long pale brushlike 

 bristly hairs on internoventral surface. Hindlegs (pi. 13, 

 fig. 10): femur distinctly longer than tibia, one row of 

 blackish short sparse bristly hairs along externoventral 

 margin, two or three somewhat long ones on apical 

 portion of dorsal surface; tibia with one row of pale 

 colored bristly hairs along externodorsal margin; tarsi 

 as long as tibia, the first segment conspicuously longer 

 than the following four segments together as in midtarsi. 



Length: Body 3.7-3.8 mm, wing 4.2-4.4 mm. 



Material examined. — Two males collected by the 

 author in Amami-Oshima Is., May 11 and 25, 1953. 



Distribution. — Formosa; Yakushima, Japan; 

 Amami-Oshima Is. 



Re.marks. — The present specimens differ from the 

 figure of Chen's report in the hyaline spots of wings 

 and in the abdominal coloration, but this difTerentiation 

 might be usual in any species. 



