FRUIT FLIES OF THE RYUKYU ISLANDS 



9 



along the yellow niediiiii postsutural callus; humeral 

 calli, one rather narrow longitudinal sjiot just behind 

 the humeral callus, the strongly curved narrow lateral 

 postsutural calli and the lanceolate median postsntural 

 callus, yellow, without the yellow presutural calli; 

 notopleural areas and just above the wingbases, waxy 

 brownish; nearly the entire surface covered with short 

 somewhat dense yellow i)ubescence. Scutellum compara- 

 tively small, yellowish. Pleura (pi. 3, fig. 1) slightly ]!aler 

 and less pubescent than the noliim, yellow, with large 

 mesopleural, sternopleural, and metapleural spots. 

 All the bristles black, rather weak: scapulars distinct, 

 the median ])air rather close together, the outer stronger, 

 in the specimen examined there is another one just 

 behind the normal bristles; only one anterior snpra-alar 

 (two ill Japanese specimens, but many examples from 

 Kyushu poss&ss only one), posteriors two; noldplcurals 

 1:1; dorsocentrals and ]3rescutellars not developed; 

 scutellars only one pan'; mesopleural and pteropleural 

 bristles distinct, but the latter smaller, no sternopleural. 



Abdomen (pi. .3, fig. 4) yellow pubescent, relatively 

 narrow, not broader than the thorax, oblong, somewhat 

 paler than the latter, witli one distinct nari'ow black 

 median longituilinal streak which extends from the 

 base of second tergum to just before the ai)ex, the 

 first to fifth terga each with an ill-defined shallow de- 

 pression near the latero-apical corners, also broadly 

 carinated at the lateral margins excepting the last 

 tergum; second tergum a liltle longer than the following 

 one, with a pair of submedian oblique brown spots; 

 third tergum with a blackish luirrow basal transverse 

 band l)roadly interrupted in the middle, bristles of (he 

 ciliation rather weak and comparatively fewer than any 

 other Ryukyu Dachiae; fifth tergum with a longitudinal 

 furrow between the so-called shining spots, which are 

 brown and less pubescent than the remaining portion; 

 venter more reddish than the dorsum, the jjleural 

 membranes longitudinally rugiilose; genitalia small, 

 blackish. 



Wings (1)1. 2, hg. 1) more or less gi-cyi^h A\ith M 

 glass-hyaline, normal in shape, R,+:, nearly straight and 

 bristled on the basal two-thirds, m-cu moderately 

 sinuate, r-m slightly ciu'ved, the ])rolongation of anal 

 cell a^ long as the apical section of anal vein, without 

 the supermunerary lobe; pterostigma and ill-dehned 

 apical spot dark brown, this color connecting with a 

 very mirrow dark brown stripe along the costal margui 

 of R,; (', R, and R3 yellow, the anal streak and large 

 border of C'u yellowish grey, R below the radial sector 

 greyish. 



Legs brow nish yellow , with tJu-ee or four apical tarsal 

 segments brown. Front legs (pi. 2, fig. 3) conspicuously 

 shorter than the midleg; femoi'a almost evenly |)ul)es- 



cenl, but externo-ai)icoventi'al margin furnished with 

 very few fine bristles; tibia slightly shorter than fennn-, 

 covered with a biownisli [jubescence; tarsi slightly 

 shorter than tibia, the fii'st segment longer than the 

 four apical segments together, half as long as the tibia, 

 yellowish pubescent, ventral surface furnished with 

 yellowish bristly hairs, renniining segments furnished 

 with a few black bristles about the apex of each segment. 

 Midlegs (pi. 2, fig. 4) longest, |)ubescent, bristling simi- 

 lar to that of foreleg; tibiae very slightly .shorter than 

 femur, with two black apical spurs, one nearly half as 

 long as the other; tarsi conspicuously shorter than the 

 tibia, the first segment distinctly shorter than half as 

 long as the tibia or nearly as long as the four apical 

 segments together. Hindlegs (pi. 2, fig. 2) distinctly 

 shorter than midleg, but pubescence similar to latter; 

 tibiae conspicuously shorter than femur, at the ventral 

 apex there Jire two minute black bristles, one nearly 

 half as long as other, no brush-patch on the interno- 

 apic.il portion, but there are five distinct transverse 

 sulci ([)1. 2, fig. 5), furnished with the usual hairs. 



Fem.\le. — Quite similar to male (pi. 3, fig. 3) ; palpi 

 more curved, relatively larger than in male; transverse 

 sulci of hind tibiae less distinct; median longitudinal 

 streak extending from the fifst througli entii-e fifth terga, 

 lateral i)attern of abdomen as in the figure. Ovipositor 

 light castaneous brown; the first segment bottle- 

 shaped and yellowish pubescent, with the mirrowed 

 apical portion somewhat transversely rugulose, nearly 

 as long as the fourth and fifth abdominal terga together; 

 second segment with a pan- of distinct longitudinal 

 sulci. 



Length: Body 12 nmi (male) to 12.5 mm (female 

 with ovipositor), wing (male and fennile) K) nun. 



Materi,\l EXAiiixED. — The i)resent descrijition is 

 l)ased on only two specimens from Amami-Oshima 

 Island, collected by Mr. S. Sato, July 1952. 



Remarks. — The author has found a difference on 

 the important character of this genus (anterior supra- 

 alar bristles (wo), that the specimens from Amanii ■ 

 Oshima Island and many ones from Kyuslui have oidy 

 one anterior supra-alar bristle, w hile the examples from 

 Kyushu po.ssessing two anterior snpra-alar l)ristles are 

 rather rare. 



Genus Cytnnoduciis >Iunro 



(li/mnodaciix Muiiro, liUiSI), p. 117. 



(i\iitii<Kl<n-us kiiniyoshii, new species 



Pl.vte 4 



Male.- Head longer than half the width, IM times 

 as wide as high. Frons (pi. 4, fig. 3) narrow, parallel- 



