FRUIT FLIES OF THE RYUKYU ISLANDS 



29 



pule yellowish, sparse hairs; tibia slightly longer than 

 tarsus, with black, rather long, hairs longer and yellowish 

 on the ventral surface, especially on apical portion; 

 first tarsal segment half as long as tibia and shorter than 

 the four apical segments together, ventral surface with 

 yellowisli bristles and lacking black ones, except 

 apically. 



Length: Bod}' 5.8-6 mm, wing 5-5.2 mm. 



Types.— Holotype, 9, USNM 69374, Rjiikyu Is., 

 Apr. 23, 1953 (USNM); paratypes, 6 9 (2 USNIM) 

 (4 NIAS). 



Remarks. — This species was first found by Mr. 

 K. Asato, the Director of the Rj'ukyu Plant Quarantme 

 Station, Naha, Okinawa. It is closel}' allied to Strumeta 

 hyalina Shiraki (1933, p. 62), but it might be distin- 

 guished from the latter by the smaller size, the linear 

 costal band, the cubital vein hardly developed beyond 

 the corner of IM2 (in hyalina it is conspicuous), the 

 face slightlj' hollowed just below the middle (in hyalina 

 conspicuously grooved transversely), the lateral spots 

 of frons subequidistant (in hyalina equidistant), and 

 other characters. 



Subfamily Trypetinae 



Genus AcidieUa Hendel 



Acididln Hendel, 1914, p. 83. 



AcidieUa okinawaensis, new species 



Plate 11 



Allied to AcidieUa mushaeitsis Shiraki, but easily 

 distinguished by the entu'ely castaneous black abdomen, 

 the shape of the thii'd antenna! segment, the distinctly 

 but shortly produced upper mouth-edge, and others. 



Male. — Head as wide as thorax, 1.8 times as wide 

 as long, 1.2 times as high as long. Frons (pi. 11, fig. 3) 

 reddish yellow, that color obscured by yellowish-grey 

 tomentum, with black, very sparse, erect pubescence, 

 nearly flat, very slightlj' elevated above eyes, as wide 

 as one eye, hardly widened anteriorly, with straight 

 lateral niargms; vertical calli comparatively short, 1/3 

 as long as frons, more or less elevated and shining; 

 oceUar triangle comparatively large, black only between 

 ocelli, just vertex with a rather shar]) straight trans- 

 verse carina extending to bases of inner verticals, lunule 

 nearly half as wide as frons, more or less shining, with 

 a distinct median longitudinal sulcus, the upper margin 

 distinctly brown, this color hardly extending to cheeks 

 along inner margins of orbits. Face (pi. 11, fig. 4) 

 light A'ellow, this color more or less obscured by a 



whitish tomentum, rather broad, conspicuously wider 

 than high, nearly straight but bent abruptly- forward; 

 slightly above upper mouth-edge, a distinct short 

 transverse furrow; orbits distinct, more or less elevated, 

 very slightly widened below; anlennal groove shallow 

 and broad, distinctly attahiing mouth-edge, with a 

 distinct yibrissal ridge with minute brown setae. Back 

 of head (pi. 11, fig. 2) swollen, upper portion slightly 

 hollowed, along one row of five or six distinct black 

 short bristles outer portions of lateral margins of 

 occiput, lower half with many fine black hairs becoming 

 longer and more bristly on ventral surface; cheek 

 narrow, with a distinct but shallow genal groove, with 

 black long pubescence on lower portion. Ej'e in profile 

 wider than half its length, with posterior margin nearly 

 straight and anterior margin evenly convex, then- upper 

 and lower angles subequally rounded. AU bristles black, 

 comparatively short; Fronto-orbitals 1:3, the superior 

 du'ected externo-posteriorty, nearly as long as upper 

 inferior, latter du-ected interno-inferiorly, the lowest 

 one shortest; ocellars distinctly divergent, a little 

 shorter than superior fronto-orbital; inner and outer 

 verticals subequal m length, the former parallel; 

 postverticals very slightly divergent, a little shorter 

 than ocellar, a small inwardly directed occipital behind 

 inner vertical. Antenna (pi. 11, fig. 5) inserted just 

 below middle of eye, light yellow, shorter than face; 

 second segment nearly half as long as thu-d, with a 

 distinct median bristle, one row of short bristles along 

 apical margin; third segment nearly twice as long as 

 wide, dorsal margin slightly undulate, more or less 

 brown and microscopically pubescent, with round apex; 

 arista pubescent. 



Thorax approxmuitel}' 1.2 times as long as wide, 

 1.15 times as long as high. Mesonotum (pi. 11, fig. 8) 

 nearly as long as wide, shining reddish yellow, with 

 l)Iack pubescence; humeral calli with some black erect 

 hah's, the lower half ivory yellow; notopleural caUi 

 well elevated, comparatively large; scutellum 1.6 tunes 

 as wide as long, basal half flat, apical half rounded, 

 without distinct lateral carinae, colored, and pubescent 

 as in the mesonotum, but apex more or less yellowish. 

 Pleura (pi. 11, fig. 7) paler than notum, an iyorj- yellow 

 longitudinal streak from the posterior end of humeral 

 callus to the wing-base, covered with a very sparse 

 erect blackish pubescence along the upper margin of 

 pleura; pro thorax with 5 or 6 black setae; sternopleuron 

 with many black long hau's along ventral margin. All 

 bristles black: scapular weak, inner pair being almost 

 parallel and a little shorter than outer humeral as long 

 as anterior notopleural, the latter longer than posterior; 

 dorsocentral a little behind level of anterior supra- 



