FRUIT FLIES OF THE RYUKYU ISLANDS 



63 



Trupanea okinawaensis, new species 



Plate 24 



A rather large Trupanea, closely related to T.fonnome 

 Hendel (1927, p. 201), but easily distiiiguished from 

 it by the comparatively long, quite hyalme pterostigma 

 and by the different wing pattern. 



Fejialp:. — Head neai'ly 1.5 times as wide as long or 

 liigh, slightly narrowed anteriorly. Frons (pi. 24, fig. 3) 

 less than twice as wide as one eye, nearly parallel-sided, 

 abruptly narrowed at anterior end, dirty orange yellow, 

 jjosterior half more or less darkened, ashy-grey tomen- 

 tose, with a broad, conspicuously whitish tomentose 

 and sparsely wliite pubescent median longitudinal 

 streak from lunule to iimuediately before blackish 

 ocellar triangle; orbits comparatively broad, distinctly 

 whitish tomentose and white pubescent; vertical calli 

 more or less elevated, fully one-third as long as frons, 

 obscured by whitish tomentum; lunule comparatively 

 large, swollen, obscured by whitish tomentum. Face 

 (pi. 24, fig. 4) a little wider than long, moderately 

 hollowed, yellowish, entu-ely obscured by \\hitish 

 tomentum; orbits rather narrow, inner nuirgins quite 

 bare; antennal grooves deep and broad, leaving very 

 narrow median and lateral carinae. Back of head 

 (pi. 24, fig. 2) moderately swollen, yellowish, upper 

 portion black, more or less dusted by whitish tomentum, 

 ventral border with l)rownish bristly hairs mtermixed 

 witli few whitish ones; cheeks rather narrow, yellowish, 

 wliitish tomentose, with narrow genal groove, vibrissal 

 edge more or less fine bristled. Fron to-orbital bristles 

 2:3; occipitals wanting. Antennae (pi. 24, fig. 5) 

 short, attaining oral margin, reddish yellow; second 

 segment comparatively large, distinctly longer than 

 half the length of third segment; third segment tlu-ee- 

 fifths as wide as long, slightly narrowed toward round 

 apex, ventral margm strongly convex. Palpi (pi. 24, 

 fig. 6) yellowish, half as wide as long, somewluit oval, 

 very sparsely bristled along ventral border. 



Thorax disthictly narrower tlian head, nearly 1.4 

 times as long as wide, slightly higher than wide, black, 

 obscured by ash-greyish tomentum and covered with 

 whitisli pubescence. Mesonotum (pi. 24, fig. 7) nearly 

 as wide as long, ])ubescence longer on i)osterior marginal 

 border; humeral and notopleural calli yellowish, former 

 with whitish short bristly hau-s, latter almost bare; 

 scutellum 1.2 tinies as wide as long, without lateral 

 carinae, disk not pubescent, marginal portion with 

 distinct whitish pubescence. Pleura (pi. 24, fig. 8) very 

 sparsely pubescent and less tomentose than on mesono- 

 tum, pteropleuron more or less reddish brown immedi- 

 ately below wing-base; jmo thorax more or less brownish 

 on lower portion, witli two or more short whitish 



bristles; sternopleuron with many long whitish hairs 

 on ventral border; mesopiiragma and postnotum quite 

 bare, distinctly whitisli tomentose. Dorsocentral 

 bristles closer to suture than to level of anterior supra- 

 alars; ])rescutellars disthictly anterior to line con- 

 necting inner jiosterior supra-alars; one basal pair of 

 scutellars; mesopleural yellowish. 



Abdomen (pi. 24, fig. 9) (without ovipositor) slightly 

 longer and wider than thorax, black, obscured by a 

 greyish tomentum, covered by a yellowish-white 

 pubescence; sixth terguni slightly longer than fifth, 

 with three pairs of browoi marguial bristles; basal 

 segment of ovipositor slightly shorter than three 

 preceding abdominal terga together, sldnuig black, 

 sparsely pubescent. 



Wing (pi. 24, fig. 1) distinctly longer than body 

 (without ovipositor), nearly 2.6 tunes as long as wide, 

 moderately narrowed apically; subcosta very slightly 

 siniiate, apical portion obsolete; Rj moderately curved, 

 ending very far before r-m; R2+3 straight, but apical 

 portion rather distinctly curved forward; R4+5 not 

 bristled, straight; m slightly sinuate apically, but 

 ending quite parallel with R446; r-m straight, per- 

 pendicular, nearer to apex of IAI2 than to its middle, 

 shorter than apical section of anterior margin of 

 IM.,; m-cu sti-aight, parallel with r-m, twice as long 

 as latter; pterostigma very slightly longer than half 

 as long as second costal cell, rather sharply pointed; 

 anal cell shorter than basal cell, apical margin slightly 

 concave. Star-shaped blackish apical patch gives off 

 five rays to posterior whig-margin, proxuiial ray 

 extending into middle of IM2, second ray along m-cu, 

 distal ray ending at end of m, and remaining two rays 

 at median third of apex of 2M2. Costal border witli 

 triangular hyaline indentation m middle of apex of 

 Ri, a round indentation hiimediately bej-ond tip of 

 R,, a larger indentation unmediatelj^ before tij) of 

 R3, quite separated from large apical spot m R5; how- 

 ever, when connected with it a black sjiot at apex of 

 R3. R5 hyaline basally, wath four hyaline spots, the 

 proximal one round and anterior to m-cu, the large 

 apical more or less triangular, the foUowuig anterior 

 connected to apical indentation of R3 and often imited 

 with apical one, and the posterior connected to apical 

 hyaline portion of 2M2; iiterostigma more or less 

 3-ell()wish, with a very small ill-defined dark s|)ot 

 at anterior base, very faint dark dot just below middle 

 of pterostigma; R with a very faint small s|)ot near 

 apex, aiiical margui more or less darkened; small 

 blackisli spot just below midtUe of the posterior margin 

 of IM2. Halteres reddisli yellow, with knob darkened; 

 squamulae light yellowish willi brown margins. 



