FRUIT FLIES OF THE RYUKYU ISLANDS 



Wing with eleven hyaline spots along entire margin 

 and two round hyaline spots at middle of disk. 



Spathulina acroleuca (Schiner) 



18. Mesonotinu black; wing with R4+5 bare or l)ristled only 



at base, with hyahne costal indentations, a few hyaline 

 spots, and rarely a bandlike pattern; abdomen shining, 

 at least apically; dorsocentrals close to level of anterior 

 supra-alars; occipital bristles thin and black, or 



yello^^^sh and thick Subfamily Aciurinae 



Pterostigma very short; anal cell .shorter than ba.sal cell, 

 inferior angle pointed but not produced; outer ver- 

 ticals very short; postverticals short, thick, yellowish 

 or black; fronto-orbitals 1:3; one pair of scutellars. 



Genus Oxyaciura Hijidel 

 Frons very spar.sely pubescent, two pairs of yellowish 

 occipital bristles, third antenna! segment elongate; 

 wing black, Ri with two large costal hyaline in- 

 dentations, posterior margin witli four hyaUne 

 indentations, two small hyaline spots at middle of 



disk Oxyaciura formosae Heudel 



Mesonotuni yellow, sometimes with black marking; 

 R)+5 bare or bristled; inferior angle of anal cell mod- 

 erately produced; wing with bandlike pattern to 

 completely hyaline, rarely with many hyaline spots, 

 no more than one distinct costal indentation; last 

 abdominal tergum of female always shorter than pre- 

 ceding Subfamily Trypetinae: 19 



19. Scutellum with four bristles 20 



Scutellum with six bristles; prothorax bristled; arista 



plumose; pterostigma very long, nearly as long as 

 second costal cell; R2+3 very slightly undulate; r-m 

 distinctly lieyond middle of 1 Mo, straight and per- 

 pendicular Genus Acanthoneura Maccnuirt 



Frons pubescent on anterior half; ocellar bristles very 

 weak; one or two pairs of fronto-orbitals; inner 

 occipital bristles present but very fine; wang with a 

 very large costal indentation immediately beyond 

 pterostigma, the posterior marginal portion broadly 

 hyaline, two small round Iiyaline spots on disk. 

 Acanthoneura amamioshimaensis, new species 



20. Prothorax without bristles 21 



Prothorax with yellowish bristles 26 



21. Wing broad with black streaks near ba.se; arista pubescent 



but not plumose; r-m just beyond middle of IM2. 

 Genus Paratrirhifhrum Shiraki 

 Shining black; frons dirty yellow with a broad brownish 

 median transverse band; fron to-orbital bristles 

 2:2; postverticals far apart; occipital bristles well 

 developed, especially the inner pair long; ocellar 

 triangle with a pair of fine bristles immediately 

 behind normal strong ocellar bristles; wing with 

 three Inroad rays from the pterostigma. 



Paratrirhithrum amamioshimaensis, new species 

 Wing without black streaks near base 22 



22. Arista plumose 23 



Arista pubescent, never plumose 24 



23. Third antennal segment rounded at apex; wing with 



radiate pattern: almost always yellowish. 



Genus Taeniostola Bezzi 

 Large, light yellow; frons parallel-sided; fronto-orbital 

 bristles 2 : 3 or more; inner occipital bristles present, 

 but con.spicuously shorter than postverticals. Meso- 

 notuni with a pair of black sublatcral st reaks and 



three black spots along posterior margin; wing with 

 a broad costal band and three tran.sverse ray.s, 

 median ray not eonnreted to costal band. 



Taeniostola tripunctata, new species 

 Third antennal segment pointed at apex; wing with banded 



pattern Genus Acrotaenioslola Kendel 



Blackish; frons yellowish or reddish brown; fronto- 

 orbital bristles 2:3; inner occipital bristles present, 

 nearly as long as postverticals; dorsal margin of 

 third antennal segment undulate; two genal bris- 

 tles . . . Acrotaenioslola antennata, new species 



24. Vein m-cu not strongly oblique, almost always perpen- 



dicular to m 25 



Vein m-cu strongly oblique, never perpendicular to m; 

 R2+3 almost straight . . Genus Phagocarpus Rondani 



a. Occipital bristles absent; only apical half of arista 



pubescent; wing with brownish black, semi- 

 circular apical streak distinctly separated from 

 basal patch. 



Phagocarpus okinawaensis, new species 



b. Inner occipital bristles present; arista pubescent 



throughout; wing with four rays from basal 

 patch, the apical arcuate one not connected to 

 basal patch. 



Phagocarpus amamioshimaensis, new species 



25. R2+3 undulate Genus Hendelina Hardy 



a. Second costal cell entirely hj'aline; subapical band 

 between wing apex and m-cu not connected to 

 apical band . . . Hendelina fossata (Fabricius) 



I). Second costal cell uniformly brown; subapical band 

 connected to apical band. 



Hendelina superflucta (Enderlein) 



c. Second costal cell l^lackish with a large h_valin{? 



quadrate spot; no subapical band between wing 



apex and m-cu. 



Hendelina nigrescens, new species 

 Ro+3 quite straight . . . Genus Chenacidiella, new genus 

 Brown; wings brown with three large hyaline costal 

 spots, a broad posterior hyaline margin, a hyaline spot 

 at posterior apex of R,>, and irregular hyaline spots 

 basally. Fronto-orbital bristles 2:2; ocellar bristles 

 rather weak, parallel; inner occipital bristles present, 

 nearly half as long as postverticles; dorsocentrals 

 slightly behind level of anterior supra-alars, sometimes 

 a pair of long bristles situated lateral of the dorso- 

 centrals and posterior to prescutellars and nearly as 

 long as latter . . . Chenacidiella purpureiseta (Chen) 



26. Head comparatively short, nearly two-thirds as long as 



high; r-m parallel with m-cu. 



Genus C'arpophlhoracidia, new genus 

 Sliining brownish; frons light or.-inge yellow; fronto- 

 orbitals 1:3; inner occipital bristles present; wing 

 with a broad blackish costal band and two radiate 

 bands . C'arpophthoracidia matsumotoi, new species 

 Head higher than long; r-ni distinctly convergent with m-cu. 



Genus Acidiella Hendcl 

 Shining light castaneous; frons reddish yellow; fronto- 

 orbital bristles 1:3; inner occipital bristles present; 

 wing brownish black, base and anal lobe entirely 

 hyaline, two large hyaline costal indentations and 

 three large ones on jiosterior margin. 



Acidiella okinawaensis, new species 



26.3-G4.- 



-6.S- 



