AEDES FULVITHOEAX 845 



scales at apex of each femur; base of first joint of eaci tarsus white scales; tarsal 

 claws simple. Wings hyaline, scales brown, narrow-lanceolate and linear inter- 

 mixed. Length about 3 mm. 



Trinidad, West Indies. A female collected by Mr. F. W. Urich. Type: No. 9140, 

 U. S. National Museum. 



Descbiption of Female, Male, and Laeva of Aisdes ftjlvithobax : 



Female. — Proboscis rather long, slender, uniform ; labellse conically tapered ; 

 vestiture black; setae minute, black, those on labellse more prominently out- 

 standing. Palpi short, about one-fifth as long as the proboscis ; vestiture black, 

 setae moderate. Antennae filiform, the joints subequal, rugose, pilose, black; 

 tori subspherical, with a cup-shaped apical excavation, entirely ochraceous, a few 

 black hairs within ; second joint thickened at middle, pale at base ; hairs of 

 whorls moderate, sparse, black. Clypeus broad, rounded triangular, depressed, 

 luteous brown, nude. Eyes black. Occiput dark brown, clothed very broadly 

 on the vertex with narrow, curved, bright golden yellow scales, broader golden 

 yellow ones on the sides; cheeks bright silvery; many erect forked golden 

 yellow scales on the nape; setae along margins of eyes black, those projecting 

 between the eyes yellow. 



Prothoracic lobes elliptical, remote dorsally, luteous, clothed with narrow, 

 curved, golden-yellow scales and dark brown bristles. Mesonotum luteous, 

 densely clothed with narrow, curved, bright golden scales, intermixed above 

 roots of wings with a few brown ones, a narrow stripe of bro^vn scales on either 

 side of antescutellar space; bristles coarse, yellowish-brown. Seutellum trilo- 

 bate, clothed with narrow curved golden scales, two submedian patches of broad 

 black scales, and a small one on each lateral lobe, each lobe with a group of 

 about eight brown bristles. Postnotum elliptical, prominent, brownish-luteous, 

 nude. Pleurae and coxae yellowish, clothed with patches of flat silvery white 

 scales and rows of dark bristles. 



Abdomen subcylindrical, tapering posteriorly, fifth to seventh segments 

 apically expanded beneath; dorsal vestiture blue-black, third and fourth seg- 

 ments with median, basal, golden triangular patches, fifth, sixth and seventh 

 segments with silvery, median, transverse, basal patches ; a row of large, lateral, 

 silvery basal spots dorsally produced towards middles of segments; first seg- 

 ment with blue-black scales and many fine pale hairs; venter yellowish-scaled at 

 base, fifth, sixth and seventh segments black-scaled with j'ellowish basal bands. 



Wings moderate, hyaline; stem of second marginal cell much shorter than 

 its cell, that of second posterior cell about equal to its cell ; basal cross- vein more 

 than its own length distant from anterior cross- vein ; scales brown, costa with a 

 blue-back reflection, the outstanding scales ligulate, denser on forks of second 

 vein. Halteres whitish, the knobs dark and with a fringe of minute white scales. 



Legs slender, moderately long; vestiture blue-black; femora pale golden at 

 base and beneath, the anterior pair to apex, the middle and hind pairs nearly 

 to tips; knees of hind and middle pairs broadly silvery; tibiae blue black, nar- 

 rowly pale within ; first tarsal joint of hind leg white on its basal fifth, a similar 

 smaller white mark on fore and middle tarsi, the remaining joints blue-black. 

 Claw formula, 0.0-0.0-0.0. 



Length : Body about 4 mm. ; wing 3.5 mm. 



Male. — Proboscis straight, long and slender, blue black. Palpi very slender, 

 as long as the proboscis, uniform, the terminal joints not enlarged and without 

 long hairs; vestiture entirely blue-black. Antennae plumose, the last two joints 

 long and slender, rugose, pilose, black, the others short, pale, dark at insertions 

 of hair-whorls ; hairs of whorls long, dense, black with a pale reflection. Colora- 

 tion similar to the female. Abdomen elongate, the lateral silvery spots visible 

 dorsally, the black scales at sides and beneath outstanding on last four seg- 



