60 



UNITKD STATES NATIONAL MUSEX'M BILLETIX 268 



space liirlit l)r()wnish; third in apical third <if R, round, 

 smaller than first; fourth at base ot Cu, ahnost con- 

 nectiuir with very small one al()ii<r; antero-apical margin 

 of basal cell. S()uanudae yellowish, witli brown marginal 

 cilia; haltcres liglit yellow, stalk long and knol) small. 



Legs light yellow, black ])ul)esceiit. Foreleg (pi. 22, 

 fig. 10) shortest; fennu' nearly l.H times as long as tibia, 

 externosii|)erior surface witli two rows ot sparse black 

 bristly liairs, externoventral margin witli about seven 

 black scry long bristly liairs; tibia nearly as long as 

 tarsus; first tarsal segment distinctly longer than half 

 the length of tibia, longer tiian the four following seg- 

 ments together, bnishlike bristles on internoventral 

 surface brownish. Midleg (pi. 22, fig. 11) longer than 

 hindleg; femur .hs long as tibia, ])ubescence on the 

 e.xternoventral surface distinctly longer and stronger 

 than that on remainnig surface, especially conspicuous 

 ah)ng externoventral margin; tibia with one strong 

 black apical spur longer than 1/3 the lengtli of first 

 tarsal segment, apex with tiny black bristles; tarsi 

 slightly shorter than tibia, first segment nearly half 

 as long as tibia, distinctly longer than the four following 

 segments together, brushlike bristles on internoventral 

 surface short but dense, many black tiny spines along 

 apical portions of interno- and externoventral margins, 

 as are the sjiines on each of following segments. Hind- 

 leg (pi. 22, fig. 12): femur a little longer than tibia, 

 dorsal surface with one pair of long black bristly hah's 

 before ai)ex, externoventral margin with long bail's, 

 of which an apical few are bristly; tibia distinctly 

 longer than tarsus, ])ubescence along externoventral 

 margin and on apical fourth of dorsal surface longer 

 than that on remaining j)ortion, ventral ai)ex with one 

 distinct bristle; first tarsal segment very slightly shorter 

 than half the tibia, basal ventral surface with two long 

 hairs, brushlike bristles and spines as in midtarsi. 



Lengtli: Body 5.S mm, wing 6.2 mm. 



IIoLOTvi'E. —Female, Amami-Osliima Is., May 20 

 (NIAS). 



Subfamily Aciiirinae 



Genus Oxyaciura Hendel 



Oxyaciiira Itcndi-l, 1927, p. 111. — Shiruki, I'J'S.i, p. 3.58, — Chen, 

 1948, p, 80. 



Oxyacitirn Jomiosiie (llendel) 



Pl.\te 23 



Aciura formosae Hendel, 191."), p. 400. 



Oxyaciura formosae (Hendel). — Shiruki, 1933, p. 360. 



Shining black species of small size, the black wings 



with nine distinct hyaline spots, the legs brownisli 

 black with the tibiae and tarsi yellowish. 



Malk. — Head very slightly narrowei- tlian, or nearly 

 as long as thorax, 1.5 times as high as long, nearly 

 twice as wide as long. Frons (pi. 23, fig. 3) j-ellowisli or 

 reddish brown, eyemargins paler, posterior third 

 blackish, very sparsely covered with light yellow, blunt, 

 pubescence, nearly as wide as eye; vertical calli short, 

 shining black; ocellar triangle shining black, large; 

 lunule distinctly covei'ed with greyish tomentmii. Face 

 (pi. 23, fig. 4) as long as wide, more or less l)roadened 

 beneath, slightly hollowed, reddish bmwii to dark 

 lirown, witli a large blackish triangular sjxit imme- 

 diately above oral niargui, with many short black setae 

 on externoinferior borders; antennal grooves; not 

 distinct ; orbits very narrow. Back of head (pi. 23, fig. 2) 

 black, moderately swollen, upper portion distinctly 

 hollowed and obscured by greyish tomentum, pubes- 

 cence black; cheeks black, obscured by greyish tomen- 

 tum, genal groove rather inconspicuous. Eyes very 

 sparsely and microscopically pubescent, in profile 

 moderately ol)lique, oblong, nearly 1.7 times as long 

 as wide, with anterior margin more convex, upjier 

 angle less rounded than lower. All bristles black, 

 ocellars short, divergent; fronto-orbitals 1:3, superior 

 pair as long as ocellars and slightly divergent, inferior 

 pair slightly longer than superiors and directed mod- 

 erately inward; inner verticals strongest and longest, 

 parallel, outer verticals very short and slightly longer 

 than bristles of occipital row ; postverticals short but 

 strong, whitish, widely spaced, on the same level and 

 behind, two jiairs of similar bristles (uiner and outer 

 occipitals) ; bristles of occipital row short and black, 

 extending to a point above middle of eye; genal bristle 

 nearly as long as ocellar. Antennae (pi. 23, fig. 5) 

 inserted at middle of eye, yellowish brown to pale 

 brown, with dorsal margin and apex of third segment 

 almost always blackish, shorter than face; second seg- 

 ment half as long as third, the median bristle com- 

 paratively short; third segment tlu-ee times as long 

 as wide, very slightly narrowed toward the round 

 apex (Shiraki [1933, p. 359] described it erroneously 

 as "more or less pointed"), with dorsal margin nearly 

 straight and ventral margin moderately convex; 

 arista black, with base yellowish, microscopically 

 pubescent. Palpi (pi. 23, fig. 6) yellowish brown, more 

 or less spatulate, black bristled. 



Thorax as long as wide, very slightly longer than 

 high, shining black, more or less obscured by whitish 

 tomentum and black pubescence. Mesonotum (pi. 23, 

 fig. 7) wider than long; humeral calli sometimes paler, 

 with three or foiLr thick whitish bristly hairs; noto- 

 pleural calli large, sometimes paler, less tonientose; 



