760 MOSQUITOES OF NORTH AMERICA 



Stage II. Head rounded, flattened, normal, darkly infuscated, the antennae 

 moderate, uniform, with normal terminal spines and hairs, sparsely spinulose, darkly 

 colored throughout; a small tuft of two hairs at basal third. Body normal, darkly 

 pigmented dorsally; air tube short, about twice as long as wide, abruptly tapered, 

 infuscated throughout, the last three pecten teeth stouter and more remotely placed 

 than the basal ones, the single hair tuft arising before the middle of the tube; 

 pecten teeth are stout spines with two short basal branches. A double row of small 

 hair tufts on the dorsal aspect of the tube. Lateral comb of the eighth segment 

 consists of seven to nine single, thorn-shaped teeth with finely pectinated bases, 

 arranged in an irregular transverse row. Anal segment with a small dorsal plate 

 and terminal tuft; ventral brush present, small, arising from a barred area, which 

 is preceded along the ventral line of the segment by small, but distinct hairs. Anal 

 process four, moderate, not inflated, without conspicuous tracheae. 



Stage III. As in Stage II. Air tube two and a half times as long as wide, its 

 dorsal hairs forming distinct tufts, the teeth of the pecten exceeding the tuft. Head 

 brown, infuscated; a small tuft at the middle of the antennae, moderate, brown. 

 Body normal. 



Stage IV. Head brown, infuscated, the antennae moderate, equal, brown, the 

 small tuft at the middle. Body normal, the hair tufts heavy, with large chitinous 

 plates, the abdominal ones slight, diminishing posteriorly. Comb of the eighth seg- 

 ment of twelve large thorn-shaped teeth; air tube two and a half times as long as 

 wide, abruptly tapered, the tuft before the middle, followed by large detached 

 teeth of the pecten, with three small tufts below and a double row of hair tufts above. 

 Anal segment not ringed; with distinct tufts before the barred area; anal tuft and 

 brush normal, large. Anal processes four, moderate, not conspicuously tracheate. 



Pupa. As usual in Culex. 



Original Description of Culex cinereobokealis : 



A larva somewhat resembling and associated with Culex impiger presents marked 

 differences in that the dorsal surface of the air tube is provided with a double row 

 of hairs, each row consisting of about four tufts composed of a pair of weakly 

 barbuled hairs. This is undoubtedly the larva which Messrs. Dyar & Knab * have 

 confused with that of Culex impiger. From this larva a large, brownish-gray mos- 

 quito 6 to 7 mm. long, with the curved scales of the head white, was obtained. This 

 species has been given the name of Culex cinereoborealis n. sp. 



*Ent. Soc. Wash. Proc, 6: 144. 1904. 



Desckiption of Female, Male, and Larva of Aedes trichurus: 



Female. Proboscis moderate, cylindrical, uniform ; labellae conically tapered ; 

 vestiture brownish-black; setae on labellse minute, outstanding. Palpi short, 

 about one-fourth as long as the proboscis, black with a few whitish scales inter- 

 mixed; setjB moderate, bristly. Antennae filifonn, the joints subequal, rugose, 

 pilose, black, second joint longer than third, slightly thicker and pale at base; 

 tori subspherical, with a cup-shaped excavation, luteous, darker within, with a 

 patch of whitish scales ; hairs of whorls short, sparse, black, Clypeus rounded 

 triangular, prominent, black, nude. Eyes black. Occiput black, scales on vertex 

 lanceolate, curved, on sides broad, mil%-white throughout, an ill-defined lateral 

 black patch ; many short, erect, forked white scales ; bristles along margins of 

 eyes black, those projecting between the eyes pale. 



Prothoracic lobes elliptical, remote dorsally, black, clothed with narrow white 

 scales and dark bristles. Mesonotum black, clothed with rather broad curved 

 scales, a very broad stripe of light bronzy-brown scales covering dorsum and 

 half of lateral area, scales along anterior edge, sides of disk and covering the 

 antescutellar space sordid white, forming a deep incision into the brown area at 

 middle of sides ; a short brown stripe at sides of antescutellar space. Scutellum 

 trilobate, black, clothed with narrow, curved white scales, each lobe with a 

 group of brown bristles. Postnotum elliptical, prominent, blackish, nude. 

 Pleurae brown, coxae luteous, clothed with patches of elliptical, flat white scales 

 and rows of pale bristles. 



Abdomen subcylindrical, tapering posteriorly; dorsal vestiture black, with 

 broad, white, basal segmental bands which widen to triangular patches on the 



