88 



UxMTlCD STATES NATIONAL MUSEUM BULLETIN 263 



the 1\v() near base yellowisli while uiul coiispiciuiusly 

 Ions::. Midleg (j)!. :52, fig. 12) disliiutly lunger than 

 liindleg: fennir distinctlj- sliorler llian tibia, pubescence 

 on ventral surface long and conspicuous near dorsal 

 surface; tibia longer than tarsus, with one black apical 

 spur, black short bristles in addition; first tarsal seg- 

 ment nearly one-third as long as tibia, shorter tluin the 

 four following segments together, e.xternoventral nuir- 

 gin with one row of short black bristles, the brushlike 

 bristl&s on the internoventral surface rather sparse. 

 Hindleg (pi. 82, fig. 13): femur as long as tibia, one 

 pair of black long bristly haii's near dorsal apex; tibia 

 as long as tarsus, with one short brownish or black 

 apical bristle; first tarsal segment shorter than the 

 three following segments together, brushlike bristles 

 on ventral surface yellowish and rather dense, externo- 

 ventral nuirgin ahnost always with two long bristles. 



Length: Body 2-3 mm, wing 2.9-3.2 nnu. 



Female. — Quite similar to male (])1. 32. fig. S). 

 Second to sbcth abdominal terga each with a i)air of 

 brown spots; last tergum as long as or very slightly 

 longer than preceding, with a transverse triangularly 

 curved sulcus, its posterior portion yellowish and bare 

 and its anterior portion pubescent as on preceding terga, 

 with three pairs of black long marginal bristles; fifth 

 tergum with two pairs of black long marginal bristles. 

 Ovipositor comparatively long and depressed; basal 

 segment longer than the two ])receding abdominal 

 terga together, with distinct lateral carinae, shining 

 dark castaneous to black, very sparselj' black pubescent; 

 second segment almost always castaneous; ovipositor 

 yellowish, sharply |)ointed. 



Length: Body (without ovipositor) l.S-3.2 nun, 

 wing 2.1-3.5 mm. 



Material examined. — Numerous males and females 

 from Iriomote Is., Jan. 10-21, Ishigaki Is., Jan. 23- 

 Feb. 27, IVIiyako Is., Mar. 4-7, Okinawa Is., Mar. 18- 

 Apr. 23, and Amami-Oshima Is., May 1-21 ; all in 

 NIAS, collected on the Bidens i)ilosa var. rediata 

 Schultz. 



Subfamily Euribiinae 



Genus Actinoptera Kondani 



Aclinoptera Hondandi, 1871, p. 162. — Shiraki, 1033, p. 446. 



Actinoptera, trypaneoides, new sperics 



Plate 33 



This species is distinguished by tiie large subhyaline 

 spots of the wings and the oblique |)ubescence on the 

 abdomen. 



Male. — Head as wide as thorax, nearly l.,5 times as 

 wide as long, nearly 1.3 times as wide as high, mod- 

 erately narrowed apically. Frons (pi. 33, fig. 3) nearly 

 twice as wide as one eye, distinctly narrowed forward, 

 flat, orange v'ellow, more or less darkeneil toward 

 vertex; orbits distinctly dusted with white tomenluni, 

 with white i)u])escence; lunule compaiutively large, 

 well elevated, light yellowish; vertical calli very short, 

 ill defined, more or less whitish tomentose; ocellar 

 triangle somewhat blackish, slightly obscured by 

 whitisli tomeiitum, a distinct transverse carina present. 

 Face (pi. 33, fig. 4) brownish, obscured by greyish 

 tomentum, more or less hollowed, distinctly wider 

 than long, with rather broad antennal grooves; orbits 

 rather narrow but distinctly broadened below, whitish 

 tomentose, vibrissal margins with short whitisli bristly 

 hails. Back of head (pi. 33, fig. 2) moderately swollen 

 below, black to yellowish below, entirely obscured by 

 wliitisli tomentum, ventral margin with long bristly 

 whitish hairs; cheeks luirrow, yellow'ish, whitish tomen- 

 tose, with rather distinct genal groove. Eyes large, inner 

 margin in front view rather strongly convex, in ])rofile 

 fully 1.3 tunes as long as wide, somewhat oblique, 

 anterior margin broadly rounded. All bristles mostly 

 black: ocellars divergent, longer than su])erior fronto- 

 orbitals but finer; front o-orbitals 1:2, the superiors 

 stronger and longer than the inferiors, which are 

 du'ected inward but not crossed; inner verticals strong- 

 est and longest, parallel, outers whitish and nearly 

 half as long as mners; postverticals whitish, slightly 

 divergent, slightly shorter than outer verticals, dis- 

 tincth' shorter than whitisli occipitals, occipitals one 

 pair; bristles of occipital rows whitish, only two, but 

 rather long; genal bristle whitish. Antennae (pi. 33, 

 fig. 2) short, not attaining oral margin, dull orange 

 yellow; second segment more or less white tomentose, 

 more than half as long as third segment, with black 

 median bristle; thii'd segment nearly two thirds as 

 wide as long, quadrate, dorsal apex roundly i)ointed; 

 arista entirely black, microscopically pubescent. Palpi 

 (pi. 33, fig. 7) yellowish, com |)ara lively short, quite 

 straight, apex with very few black short bristles. 



Thorax distinctly longer than wide, as wide as high, 

 evenly blackish and conspicuously obscured by grey 

 tomentum, pubescence whitish and rather sparse. 

 Mesonotum (pi. 33, fig. 6) slightly wider than long, 

 with black spot at root of each bristle; humeral and 

 notopleural calli not |)ale, the former with short whitish 

 bristles, latter bare; scutellum longer tlian luilf the 

 width, without lateral carinae, one pair of lilack spots 

 at roots of basal scutellars, lateral bases with ill-defined 

 dark sjx)!. I'leura (pi. 33, fig. 5) almost bare; prothorax 

 with one transverse row of three whitish bristly hairs; 



