FRUIT FLIES OF THE RYUKYU ISLAXOS 



23 



Genus Strunieta \^ alker 



Strumeta Walker, 1856, p. 33. 

 Chaelodaciis Bezzi, 1913, p. 93. 



Striinieta dorsalis okinataina (.Shiraki) 



Plate 9 (pigs. 1-16) 



C'haetodaciis ferrugineus var. okinaiiuiniis Shiraki, 1933, p. 62, 

 fig. IS; pi. 1, fig. .5. 



Male.^ — Head wliitisb yellow to yellow, nearly as 

 wide as mesonotum, about two-thirds as long as wide, 

 about 1^6 times as liigh as long. Frons (pi. 9, fig. 4) 

 light yellow to dirty yellow, moderately covered with a 

 wliite tomentum and with white erect setae at about 

 the middle, with three pairs of reddish-brown to black 

 lateral spots and a narrow vertical transverse band, 

 liardly one-third as wide as the head, very slightly 

 widened forward, surface very slightly hollowed but 

 somewhat elevated on middle portion, where there 

 occurs a somewhat triangular or ovate median sj)ot, 

 its shape variable; ocellar triangle black; lunule reddish 

 brown to black; vertical calli hardly traceable. Face 

 (l)l. 9, fig. 3) waxy yellow, with a pair of black roundish 

 lateral spots not attaining mouth-edge, a pau' of ill- 

 defined, small brownish spots just below antennal bases, 

 the median portion just below antennae distinctly elevated, 

 iioUowed above the upper mouth-edge; eye-margins 

 moderate in width. Cheek rather low, the same color 

 as face, an indistinct brownish spot below lower angle 

 of eye. Back of head (pi. 9, fig. 2) with two paii-s of 

 brown to black spots on upper half, the inner paii' very 

 small and placed just inside the occipital suture, the 

 outer large along the broad border of eye-margin, 

 these two sometimes united or forming two i)airs of 

 longitudinal stripes from occipital foramen to near 

 upper margin along occipital sutures. Anteimae (pi. 9, 

 fig. 5) rather long, yellowish; first segment jjale, a little 

 shorter tlian second, apical margin with some brown 

 setae; second segment nearly one-tliird as long as 

 third, median bristle of the dorsal margin brownish 

 and moderate in length; third segment darker than 

 preceding, especially on externo-apical [)ortion, about 

 3)2 times as long as wide, very slightly narrowed 

 toward the rounded tip; arista black with basal third 

 light yellow, approximately as long as the second and 

 third antennal segments united. Palpi (pi. 9, fig. 7) 

 rather large, about 3 times as long as wide, same width 

 throughout, moderately curved above, light j'ellow, 

 with dorso-apical margin slightly darkened, a large 

 brown patch near exterior base. All bristles blackish 

 brown; about 6 very fine bristles in occipital row; 

 fronto-orbitals 1:2, equidistant. 



Mesonotum (pi. 9, fig. 10) black, the inner margin 

 of huneral calli, anterior portion of notopleural calli, 

 sutural areas, and sometimes the ill-defined, somewhat 

 triangular ])osterior area, reddish brown, obscured by a 

 grey tomentum and a fine yellow pubescence, three 

 pau's of moie or less indistinct dark longitudinal 

 stripes on the disk, of which the median pair is quite 

 inconspicuous and is united at about the middle, tlie 

 second pair extend from middle of imier margin of 

 humeral calli to before posterior margin through the 

 inner ends of the svitures, where it is interru))ted, the 

 remaining pair occur only along the iimer margin of 

 lateral postsutm-al calli; in addition, another jiair of 

 brown longitudinal stripes along outer margins of 

 lateral postsutural calli; humeral, nolopleiu'al and 

 lateral postsutural calli dull orange yellow. Scutellum 

 bright yellow, with base black; mesophragma entirely 

 black, oljscured by a grey tomentum. Pleura (j)!. 9, 

 fig. 9) sliining black, propleuron, wing-base, and lower 

 borders of hyi)o[)leuron and metapleuron reddish brown, 

 witli two cons]ncuous yellow spots, the anterior one 

 rather l)road, extending straight from notopleural callus 

 to u])per |)ortion of sternopleuron, the posterior one 

 situated on the metapleuron, a little smaller than the 

 anterior spot. All bristles blackish or brownish; scutel- 

 lars 1 pair, nearly parallel, about as long as scutellum; 

 prescutellars barely in front of level of postalars; 

 notopleural thicker tlian any others but not longer; 

 supra-alars 1:2; scapidars distinct, sometimes an 

 additional one just behind outer pair and some small 

 bristles between outer and inner pairs. 



Abdomen (pi. 9, fig. 12) orange yellow to reddish 

 yellow, with black pattern as follows: The basal seg- 

 ment (first) entirely black; one pair of lateral spots on 

 first tergmn (second segment) extending from posterior 

 corners of basal segment to posterior corners of second 

 segment; two pairs lateral spots on second (third seg- 

 ment) tergum, one narrow-transverse ])air on anterior 

 one-tiiird, sometimes united, and the other pair along 

 lateral margins narrow and gradually narrowed behind; 

 basal band on the third tergum (fourth segment) 

 narrower than half as long as the tergum, occupying 

 broadly the entire lateral borders; a widely interrupted 

 basal band on the fourth tergum (fifth segment) hardly 

 touching lateral borders; lateral spots on the fifth ter- 

 gum (sixth segment) somewhat triangular, attaining pos- 

 terior half along lateral marguis; median strijje from the 

 basal band of the thii-d tergum to near tlie posterior 

 end of abdomen, rather narrow. Bristles of thu'd ter- 

 gum black; the so-called shining spots of fifth tergum 

 very large, pale brown to reddish brown. 



Wing (pi. 9, fig. 1) hyaline, with the veins brown or 

 yellowish brown; pterostignia and entire anal cell 



