FRUIT FLIES OF THE RYUKYU ISLANDS 



47 



Pluigocaipiis (I iiKi iniosJihnaensis, new species 



Plate 18 



A rather large yellowish-brown species, allied to P. 

 vulgaris Shiraki, but easily distinguished by the wing- 

 pattern, the long third antennal segment, and other 

 characters. 



Male. — Head slightly narrower tlian thorax, 2/H as 

 long as wide or high. Frons (pi. IS, fig. 2) yellowish 

 brown, hardly whitish tomentose, with black very sparse 

 erect pubescence, nearly parallel-sided, approximately as 

 wide as one eye, nearly 1 .5 times as long as wide, ratlier 

 flat; vertical calli comparatively narrow, somewliat 

 shining; ocellar triangle comparatively small, black, a 

 distinct but short transverse carina between the 

 lateral ocelli and the iimer \ertical bristles; lunule dis- 

 tinct, more or less [jaler tiian frons. Face (i)l. 18, fig. 3) 

 whitish tomentose, nearly as long as wide, very slightly 

 and evenly hollowed, with distinct but rather shallow 

 antennal grooves and narrow orbits, lower portion 

 between orbits and antennal grocn'es with very short, 

 irregularly du'ected black setae. Back of head (pi. IS, 

 fig. 1) somewhat swollen, light brownish yellow, upper 

 half well hollowed, blackish rather long ])u])escence on 

 portion around occipital foramen, lower portion with 

 many blackish setae; cheeks rather short, vibrissal 

 margin with many black, comjjaratively long bristly 

 hairs, genal groove fine. All bristles black; fronto- 

 orbitals 2:3, superiors stronger than inferiors, which 

 are convergent; verticals two pairs, inners straight and 

 nearly twice as long as upper fronto-orbital, which is 

 bent backward strongly; postverticals weak but faii'ly 

 long, somewhat ])arallel; the inner occipitals well de- 

 velojied, nearly as long as postvertical, ocellars parallel, 

 weak, somewhat longer than ui)per sujjerior fronto- 

 orbital; occii)ital row extending to below middle of eye, 

 composed of rather long bristles; genal bristle long. 

 Antenna (pi. IS, fig. 4) light brownish yellow, a little 

 shorter than face, with distinct median bristle; third 

 segment nearly three times as long as wide, apex round; 

 arista blackisli, with basal portion yellow, the black 

 portion distinctly black pubescent. Palpi (pi. 18, fig. 5) 

 yellowish, with many black bristly hairs, approximately 

 twice as long as wide, nearly the same width throughout, 

 with blunt apex. 



Thorax distinctly longer than abdomen, but sliglitly 

 narrower than latter, brownish yellow. Mesonotiun 

 (pi. 18, fig. 6) somewhat longer than wide, whitish 

 tomentose and black pubescent, three narrow longi- 

 tudinal nontomentose streaks (seen from behind), of 

 Avhich median is nearly twice as wide as lateral paii- 

 and not quite attaining dorsocentrals, lateral pair 

 extending from hiside of humeral calli to near posterior 



margin tlu'ough inner ends of sutures; humeral calli 

 with black erect setae on anterior border; notopleural 

 calli almost bare, but not shining; scutellum conspicu- 

 ouslj^ wider than long, flat, with rather distinctly 

 sloi)ed marginal area, slightly paler than mesonotum; 

 mesophragma and postnotum liglit brownisii yellow, 

 the latter with indistinct narrow blackish median 

 longitudinal spot. Pleura (pi. 18, fig. 7) uniformly light 

 brownish yellow, more or less shining; mesopleuron 

 sparsely but distinctly black pubescent; sternopleuron 

 with long black, bristly hairs along ventral border; 

 l)teropleuron with one row of black short bristly hairs. 

 All bristles black, long: scapulars two ])airs, iimer 

 very short, outer longer, behind latter one short 

 bristle; noto[)leurals two, posterior distinctly shorter 

 than anterior, which is somewhat longer than humeral, 

 as long as presutural; dorsocentrals conspicuouslj- 

 behind a line connecting anterior supra-alars; pre- 

 scutellar sittuited at level of inner posterior supra- 

 alars; scutellars two pairs, ajjical nearly parallel; 

 mesoijleurals two, both as long as pteropleural or 

 sternopleural. 



Abdomen (pi. IS, fig. S) nearly round, black jjubes- 

 cent; two basal terga light castaneous, second tergum 

 with yellow posterior border; thu'd tergum castaneous, 

 posterior half j'ellowish; fourth and fifth terga shuiing 

 black their posterior margins with one row of sjjarse 

 long black bristles; genitalia small with v'ellowish 

 appendages. 



Wing (pi. IS, fig. 9) comparatively large, nearly 

 2/3 as wide as long; costal vein distinctly reaching to 

 end of m, bristles rather short, costal spine conspic'uous 

 and as long as basal bristle. Basal patch blackish, 

 yellowish at basal, two-thirds, with six hyaline spots 

 as follows: one very large indentation nearly filling 

 second costal cell, attaining rs; second costal mdenta- 

 tion triangular, situated outside the black j) teres tignui, 

 exteiuling below to anterior end of r-m, a narrow apical 

 trsmsverse band; one very small transverse dot in R, 

 another mimite one in basal cefl; two transverse bands 

 in basal half of Cu, apical situated near ajiical margin 

 and basal near base interrupted at about middle; 

 first costal cell and area below it hyaline. Two apical 

 blackish streaks not connected to eacii other, the 

 anterior, longer one arcuate from near base of R5 

 around end of R2+.3, along costa to apex of wing, ending at 

 slightly beyond end of R^+.,; the other shorter, on m-cu, 

 veiy slightly curved, anterior end connected with basal 

 I)atch at posterior end of r-m, and posterior end attain- 

 ing hind nuirgin. Pterostigma ai)pro.\imately half as 

 long as second costal cell; R4+5 distinctly but sparsely 

 bristled from base to just beyond middle of ajiical 



