546 MOSQUITOES OF NORTH AMERICA 



thickened ; long joint with a slight constriction resembling an articulation be- 

 fore the middle ; vestiture of black scales with metallic blue luster ; end of long 

 joint and last two joints with numerous long black setae. Antennae plumose; 

 last two joints long, pilose, the others short, slender, whitish, blackish at origins 

 of hair- whorls ; tori subglobose, hollowed at tip, dark brown ; second joint with 

 many black erect scales ; hairs of whorls long, blackish. Coloration similar to 

 the female. Abdomen elongate, strongly depressed, broadened to fifth segment, 

 with coarse black lateral ciliation. Wings narrower than in the female, stems 

 of fork-cells longer, vestiture less abundant, membrane less infuscated. Legs 

 with raised scales less pronounced, the rings on tarsi smaller. Claw formula, 

 2.1-2.1-1.1. 



Length : Body about 7.5 mm. ; wing 5 mm. 



Genitalia (plate 20, fig. 142) : Side-pieces about twdce as long as wide, tips 

 rounded, without basal or apical lobes. Clasp-filament greatly enlarged, in- 

 flated, densely covered with setae, a large subbasal projection bent in at right 

 angles at apex, roundedly inflated ; apical portion of clasp slender, bent inward 

 at right angles, with a small inserted terminal spine. Harpes rather broad, 

 concave, rounded at tip, inner margins revolute with a number of small indenta- 

 tions and several triangular teeth at apex. Harpagones with a long, rather thick 

 and large round capitate apex covered with many short, stout setae. Unci ap- 

 proximate, subcoufluent, margins revolute, subdenticulate towards apex, a few 

 fine setae representing basal lobes. 



Larva, Stage IV (plate 114, fig. 388). Head subquadrate, wider than long, 

 posterior angles rounded; eyes on an irregular prominence; antennae inserted 

 laterally on an angled prominence; front margin shallowly emarginate. An- 

 tennse cylindrical, nearly uniform, sparsely spined all over, a single hair at outer 

 fourth ; four articulated terminal processes and a long spine, twice as long as 

 processes. Eyes large, divided, the larger anterior part pointed. Both pairs of 

 dorsal head-hairs single, approximate ; ante-antennal tuft triple. Mouth-brushes 

 inserted on outer angles of head, folded downward and backward. Mental plate 

 triangular, with a large central tooth and eight on each side, penultimate one 

 very large and projecting, last one small, the rest subequal. Mandible quad- 

 rangular, convex without, smooth, a single appendage near tip ; an outer row of 

 few coarse filamentous setae ; dentition of eight teeth, first and fifth long, espe- 

 cially the first, which is projecting and sharp, the others diminishing succes- 

 sively ; four oblique tooth-like projections below; a small projection at angle; a 

 row of small setae near base. Maxilla rounded rectangular, attachment oblique, 

 tlie short palpus sessile on outer angle ; various short spines and setae on inner 

 aspect. Palpus hardly longer than broad, with four rudimentary digits. Thorax 

 rounded, about as wide as long, anterior margin strongly convex ; lateral single 

 hairs long, tufts short. Abdomen stout, segments transverse, anterior ones 

 strongly projecting laterally ; long lateral hairs double to fifth segment, single 

 on sixth; secondary hairs in small tufts. Tracheal tubes broad, band-shaped, 

 nearly even. Air-tube stout, about four times as long as wide, conically tapered 

 from near base, tip hardly widened ; pecten reaching to middle of tube, long ; 

 single tooth a quadrangular scale with excavate base and roundedly furcate apex, 

 one branch produced into a long hair ; a single hair beyond middle of tube and 

 beyond pecten. Lateral comb of eighth segment a long curved row of scales 

 preceded by a large area of minute scales; single scale with a long terminal 

 broad spine, twice as long as the body of the scale, one or two rounded teeth 

 on one side, one to five on the other ; small scales short and broad, terminated 

 in a row of cilia. Anal segment longer than wide, ringed by the plate ; dorsal 

 tuft a long hair and brush on each side ; a single lateral hair ; ventral brush a 

 series of short tufts running whole length of ventral line. Anal gills very long, 



