910 MOSQUITOES or NORTH AMERICA 



metallic blue scales on mid lobe; some dark narrow scales on lateral lobes. 

 Postnotum large, brownish ocherous, shining, nude. Pleurae pale brownish- 

 yellow with a large median dark spot covered by a patch of broad metallic blue 

 scales ; coxae pale luteous. 



Abdomen subcylindrical, somewhat expanded towards the tip, the segments 

 with scattered coarse bristles, numerous on first segment and at apex ; dorsal 

 vestiture of blackish-brown scales, the third, fourth, and fifth segments with 

 somewhat irregular apical bands of white scales ; sixth segment with a few white 

 apical scales ; venter dark scaled, with obscure apical pale bands. 



Wings rather narrow, hyaline ; forks of second and fourth veins short ; basal 

 cross-vein upright, rectangular, distant about its own length from anterior 

 cross-vein; scales of the veins small, clavate, dark brown, extreme apex and 

 fringe paler; sparse, large, broadly lanceolate, outstanding pale scales along 

 lower branch of second vein, outer half of third and upper branch of fourth ; 

 a short line of broad blue scales beginning at base of fourth vein and continued 

 on fifth vein over less than the basal third. 



Legs rather long and slender ; vestiture blackish-brown marked with white ; 

 femora largely pale beneath ; ends of femora with a silvery white patch ; ends of 

 tibias white marked, the hind ones very broadly so; front and middle tarsi 

 obscurely banded, the bands involving both ends of the joints ; hind tarsi with 

 apex of first and base and apex of second joints narrowly white banded, third 

 joint with narrow basal and broad apical white band, fourth joint white with 

 median black ring, fifth joint entirely white. Claw formula, 0.0-0-0.0. 



Length: Body 2.5 mm.; wing 2 mm. 



Genitalia: Side-pieces short and broad, slightly longer than wide, tips 

 conically rounded ; basal lobe slight, low, setose. Clasp-filament as long as 

 side-piece, emarginate on one side toward tip, which bears a small terminal 

 claw. Harpe-like appendages a pair of stout rods with rounded tips. False 

 harpagones divided into three stout curved teeth, the two inner ones borne on a 

 common pedicel. 



Female. No specimens of this sex are before us. 



Larva, Stage IV. Head elongate, bulging at eyes, tapering anteriorly, 

 front margin with a median excision and heavy spinose processes at its sides ; 

 eyes large ; antennae small, basally thickened, with a few small spinules ; dorsal 

 head-hairs apparently single and thickened (broken in the specimen) ; ante- 

 antennal tufts small, multiple. Thorax subquadrate, flat. Abdomen with the 

 segments widened posteriorly, the hairs in small tufts, long lateral hairs ap- 

 parently single (broken). Lateral comb of eighth segment of five stout teeth 

 on a plate, the upper and lower ones short, the central one long. Air-tube 

 moderate, cylindrical, uniform, about five times as long as wide, with pecten 

 of about twelve uniformly spaced small teeth, a moderate hair-tuft near the 

 middle closely following the pecten ; single pecten teeth with a delicate trans- 

 parent fringe on the sides. Anal segment nearly twice as long as wide, uni- 

 form, ringed by the plate ; dorsal tuft of a hair and large tuft on each side ; a 

 large lateral stellate tuft ; ventral brush small, the tufts few-haired ; anal gills 

 broad, ensiform, not as long as the segment. 



Professor Moore reared one of our specimens from larvae found in one of the 

 sweet water canals near Georgetown. 



South America and Lesser Antilles. 



Georgetown, British Guiana (H. W. B. Moore). Also reported from Argen- 

 tina (Arribalzaga), States of Sao Paulo and Eio de Janeiro, Brazil (Peryassu), 

 and Antigua, West Indies (Theobald). 



Uranotcenia pulcherrima varies in the thoracic ornamentation. One of our 

 specimens, instead of the median line of metallic blue scales, shows only a patch 



