MANSONIA FLAVEOLTJS 523 



more than its own length before anterior cross-vein ; scales of wing veins in two 

 series, lanceolate one^, overlaid by very broad, obliquely subtnmcate and sub- 

 ovate ones ; fringe unicolorous, pale brownish. 



Legs clothed with ochreous yellow scales and many dusky ones intermixed; 

 apices of first tarsal segments mostly dark scaled, on front and middle tarsi the 

 segments are mostly dusky scaled above ; on the middle pair the second segment 

 is broadly ringed with whitish at base, the third and fourth segments more nar- 

 rowly so; on the hind pair the second, third, and fourth segments are very 

 broadly ringed with whitish at bases, the fifth narrowly so. Claw formula, 

 3.0-2.0-0.0. 



Length : Body about 5.5 mm. ; wing 4.5 mm. 



Genitalia (plate 34, fig. 227) : Side-pieces over twice as long as wide, conical, 

 slightly constricted near middle, without lobes. Clasp-filament very stout and 

 thick, tapering to tip, a wing-shaped branch on inner side, serrate outwardly, 

 rounded at tip ; a short, stout, terminal articulated spine at tip of filament. 

 Basal lobe represented by a long, stout smooth process, reaching well toward 

 tip of side-piece, slightly attenuated mesially, bearing at tip two articulated 

 claws. Harpes elliptical, inner margin strongly revolute, tip recurved and 

 dentated. Unci forming a basal cylinder. No basal appendages. 



Life history and habits unknown. 



Lesser Antilles, West Indies. 



St. Thomas, Virgin Islands, August, 1905 (A. Busck). 



Mansonia flaveolus is known only from the single type specim.en. The wing 

 scales greatly resemble those of Mansonia titillans in character, but the broad 

 scales are proportionately smaller. 



