FRUIT FLIES OF THE RYUKYU ISLAND^ 



57 



111-cu nearly straiglil, parallel with r-m; pterostignia 

 \ eiy short, nearly half as long as C2, often pale apically; 

 IM2 slightly widened apically, with nearly right-angled 

 antero-apical corner and acute postero-apical angle; 

 anal cell shorter than basal cell (M), but wider, its 

 posterior prolongation pointed, hardly half as long as 

 cell proper. Squamae j-ellowish white to white. Halteres 

 yellowish brown to brown, stalk pale. 



Legs short and strong, brownish yellow, with tibiae 

 and tarsi light j-ellow, apical segments of latter more 

 or less brownish. Forelegs (pi. 21, fig. 10) distinctly 

 shorter than others; fenuir nearly 3.6 times as long as 

 wide, conspicuously narrowed toward both ends, black 

 pubescent, externodorsal surface with many short 

 l)lack bristles, externoventral margm with one row 

 of 11-12 long black bi'istles intermixed with long hairs; 

 tibia nearly 2/3 as long as femur, slightly bent near 

 base, covered with sparse brown pubescence, externo- 

 ventral apex with long yello\v bristle; tarsi distinctly 

 longer than tibia, the first segment slightly longer than 

 the four apical segments together, the internoventral 

 surface with dense, light yellow, brushlike bristles. 

 remaining surface w'ith short brown pubescence, each 

 of the four following segments with two or three black 

 short bristles at internoventral apex, pubescence 

 almost all long and brown, claws rather slender, black. 

 Midleg (pi. 21, fig. 11) not longer than hindleg; femora 

 distinctly narrowed apicallj^, black pubescent, ventral 

 surface distinctly grooved nearly throughout, its outer 

 margin with approximately six long black bristly hairs, 

 its inner margin with one row of similar hah's; tibia as 

 long as femur, pubescence short and black, apical spm' 

 black and half as long as first tarsal segment, dorsal 

 surface with a row of black sparse short bristly hairs, 

 externo-apical margin with three short spm'like bristles 

 in addition to spur; tarsi 2/3 as long as tibia, first seg- 

 ment as long as four foUowmg segments together, with 

 black minute pubescence, internoventral surface with 

 yellowish, dense, brushlike bristles interniLxed with 

 short black spinelike bristles at apical thu'd or fourth, 

 second to fifth segments with two rows of black short 

 bristles on ventral surface. Hindlegs (pi. 21, fig. 12) 

 similar to midleg; femur as long as tibia, apical fourth 

 I if dorsal surface with ajiproximately five black long 

 bristly hairs, ventral surface with very sparse, moder- 

 ately long hah's, hi addition sLx black long bristh- hairs 

 on apical fourth; tibiae broadened at about middle, 

 median fourth of externodorsal nuirgin with one row 

 of black bristly hairs, internodorsal margin with one 

 row of short black ones, external apex with a short 

 yellowish spinelike bristle; tarsi distinctly shorter than 

 tibia, first segment conspicuously longer than four 

 following segments together, distinctly shorter than 



lialf the length of tibia, pul)escence and bristles as on 

 midtarsus. All coxae witli many blnck long curved 

 bristly hah-s. 



Length: Body 4-6 mm, wings 4-5.5 mm. 



Types.— Holotype, cf, USNM 6937,8; paratypes, 10 

 & (BMH and NIAS); all from Amami-Oshima Is., 

 May 1-11, 1953. 



Genus Acanthoneura Macquart 



Accinthonevra Macquart, 1843, p. 377. — Enderlein, lit! 1 (in 

 part), p. 414. — de Mcijcre, 1914, p. 202.— Hendel, 1927, 

 J). .57.— Shiraki, 1933, p. 294. 



Acanthoneura anianiioshunaensis, new species 



Plate 22 



Closely allied to A. Jormosana Enderlein, but easily 

 distinguished by the pattern of mesonotum and abdo- 

 men, and by the black basal segment of the ovipositor. 



Female. — Brownish species of medium size. Head 

 narrower than thorax, nearly half as long as wide, 

 shghtly higher than long. Frons (pi. 22, fig. 5) ochra- 

 ceous, anterior one-fourth reddish brown, obscured by 

 3'ellow tomentum black sparse erect pvibescence, as 

 wide as eye, slightly longer than wide, lateral margins 

 hardly concave, two very faint longitudinal fmrows 

 throughout nearly enthe length along mner sides of 

 vertical caUi; vertical calli comparatively long, attam- 

 ing middle of frons, bare and shining; lunule verj- 

 small, somewhat sunken, whitish; ocellar triangle 

 black, a rather broad transverse carina extending to 

 inner verticles. Face (pi. 22, fig. 6) 3/5 as high as wide, 

 nearly flat and straight, abruptly produced fonvard 

 above oral margin, tomentose; antennal grooves very 

 famt; vibrissal margins with a few* black setae on lower 

 portion; orbits very narrow', slightly widened below. 

 Back of head (pi. 22, fig. 4) light j-ellow', nuiderately 

 swollen, lateral margms of occipital foramen witli one 

 row of distinct black bristly hairs; checks rather 

 narrow, with black setae, genal groove very fauil. Eye 

 in profile oval, posterior margms moderately cur^"ed 

 outward and anterior margin strongly convex, antero- 

 superior nuirghi ahnost straight, 1.4 tunes as long as 

 wide. All bristles black: fronto-orbitals 2:1, inferior 

 nearly as long as upper superior and directed inwai'd; 

 ocellars weak, moderately di\ergent; postverticals 

 rather widely spaced, parallel, comparatively strong, 

 longer than ocellars, nearly as long as upper sui)erior 

 fronto-orbital; inner verticals longest, slightly diver- 

 gent, the outer distinctly shorter tlian low-er superior 

 fronto-orbital, a very short bristle (occipital) distuictly 

 weaker and shorter than bristles of occipital row; 

 latter comparative^ strong, composed of about 10 



