884 MOSQUITOES OF NORTH AMERICA 



second posterior cells with a white patch; at cross- veins a transverse bar of 

 white extending across the second, third, fourth, and upper branch of fifth 

 veins; fifth vein with a large white patch at base of fork. Halteres pale, with 

 dark, minutely scaled knobs. 



Legs long and rather slender; vestiture black with numerous ocher-yellow 

 irregular spots and fasciae on femora, tibise and first tarsal joints ; hind femora 

 basally pale beneath and on inner side ; front and middle femora with a yellow- 

 ish ring towards apices ; knees broadly yellow ; tips of front and middle tibiae 

 yellow; front tarsi with base of first and tip of second joints narrowly yellow, 

 and all of third, fourth and fifth joints dorsally yellow ; middle tarsi with bases 

 and apices of first, second and third, and all of fourth and fifth segments yellow- 

 white with a silver luster ; hind tarsi with apex of second and all of third and 

 fifth segments brilliant yellowish-white, the fourth broadly black-ringed in the 

 middle ; femora with scales erect at apices, giving an effect of tufting, most dis- 

 tinct on middle pair. Claw formula, 0.0-0.0-0.0. 



Length : Body 4.5 to 5 mm. ; wing 4.5 to 5 mm. 



Male. Proboscis long and moderately slender, straight, somewhat swollen 

 towards tip ; vestiture of black and scattered ochraceous scales, base of labellse 

 with shining whitish scales. Palpi long, nearly attaining tip of proboscis, 

 straight, very slender, but slightly enlarged towards tips ; terminal segment 

 small and slender; vestiture ocher-yellow and black intermixed, the black scales 

 predominating on terminal segments, the yellow ones on long joint; tips of 

 segments narrowly white scaled and the long segment with a median white 

 ring. Antennae sparsely plumose, long and rather stout, ringed, slightly longer 

 than the proboscis, the segments nearly cylindrical and unusually elongate for a 

 male mosquito, white with broad black rings; last two segments slender and 

 very long ; hairs of whorls long, black ; tori rather small but prominent, black, 

 covered with whitish scales. Front of head above antenna transversely pro- 

 tuberant, bright yellow with two small brown spots. Clypeus prominent, 

 narrow, conical, dark brown, apex pale. Coloration similar to the female. 

 Abdomen more elongate than in the female, subcylindrical, depressed ; dorsally 

 with a double series of basal segmental dull yellowish triangular patches ; apical 

 segments with short, sparse and rather coarse lateral ciliation. Wings narrower 

 than those of the female, vestiture the same, the stems of the fork-cells longer. 

 Legs longer than those of the female. Claw formula, 1.0-1.0-0.0. 



Length : Body 4.5 to 5.5 mm. ; wing 4 to 5 mm. 



Genitalia (plate 36, fig. 239) : Side-pieces over twice as long as broad, uni- 

 form, tips rounded; a large rounded basal lobe bearing three stout spines and 

 two long setae besides a coating of small hairs. Clasp-filament long and slender, 

 slightly enlarged at base, a long articulated subterminal spine. Harpes 

 elliptical concave, margins revolute, apex bearing three teeth. Harpagones 

 wanting. Unci plate-like, with curled tips. 



Larva, Stage IV (plate 139, fig. 447). Head rounded, subquadrate, nearly 

 straight on the sides, front margin broadly arcuate. Antennae moderate, cylin- 

 drical, swollen near base and tapering outwardly, smooth ; a large tuft at basal 

 third ; at tip two rather long spines, two short ones and a digit on a pedicel. Men- 

 tal plate triangular, with a large central tooth and ten on each side, three basal 

 ones large and distant. Mandible quadrangular; two large filaments and a 

 small one before tip; an outer row of cilia from a collar; a row of small fila- 

 ments along outer margin ; dentition of four small teeth on a slender process ; 

 a long serrate filament and row of stout hairs within, a long tooth at base; 

 process below slender, furcate, lower limb much the longer, a tuft of hair at 

 tip of each limb and a row along front margin ; basal angle small ; two hairs 

 within and four at base. Maxilla elongate, conical, divided by a suture ; inner 



