724 MOSQUITOES OF NORTH AMERICA 



Observations. Four specimens of this species have been received. One shows 

 considerable abdominal variation, the white scales being dotted irregularly over the 

 surface; the abdominal ornamentation is, however, decidedly characteristic, as is 

 also the thoracic, and should serve at once to separate it from the other Culices with 

 unhanded legs. The distribution of the two coloured scales to the wing is also 

 peculiar. Two of the specimens were from Stony Mountain, and the other two from 

 St. Boniface. It has some resemblance to C. dorsalis. but is distinct, having un- 

 handed legs, etc. 



Description of Female, Male, and Larva of Aedes spencerii: 



Female. Proboscis slender, rather long, subcylindrical, uniform, the labellae 

 rather broad ; vestiture black ; setae minute, curved, black, those on the labellae 

 more prominently outstanding. Palpi short, less than one-fifth as long as the 

 proboscis, black scaled, some pale ones intermixed, particularly at bases of joints ; 

 setas moderate, black. Antennae with the joints subequal, rugose, pilose, black, 

 second joint slightly enlarged, with a small patch of white scales on inner side ; 

 tori subspherical, with a cup-shaped apical excavation, brownish black, clothed 

 within with small white scales. Clypeus short, rounded, prominent, black, nude. 

 Eyes bronzy-black. Occiput black, clothed with shining grayish white scales, 

 narrow curved ones on the vertex, broader ones on the sides, many slender erect 

 forked pale yellow scales on the nape ; cheeks clothed with broad grayish white 

 scales; bristles along margins of eyes black, those projecting between the eyes 

 pale yellow. 



Prothoracic lobes elliptical, remote dorsally, black, clothed with pale brown 

 and whitish scales and pale bristles. Mesonotum black, clothed with narrow 

 curved scales, dark bronzy brown in a broad median stripe and narrowly along 

 the lateral margins, shining yellowish white scaled on sides of disk and about 

 antescutellar space ; a narrow dark-brown stripe each side of antescutellar space 

 and extending over posterior third of the disk. Scutellum trilobate, black, 

 clothed with narrow, curved, yellowish white scales, each lobe with a group of 

 pale bristles. Postnotum short, elliptical, prominent, blackish, nude. Pleurae 

 and coxae blackish, clothed with patches of elliptical, flat, white scales and rows 

 of pale setae; prothoracic epimera clothed with bronzy brown scales like those 

 on mesonotum. 



Abdomen subcylindrical, flattened, tapering posteriorly; dorsal vestiture of 

 black and grayish-white scales, the whitish scales predominate, forming apical 

 and basal segmental bands and medio-dorsal and lateral lines, the last two seg- 

 ments being almost wholly whitish scaled above ; first segment with a patch of 

 white scales and many pale sette ; venter almost wholly whitish scaled, a small 

 black spot medianly at the base of each segment. Cerci black. 



Wings moderate, hyaline ; petiole of second marginal cell a little longer than 

 its cell, that of second posterior about the length of its cell ; basal cross-vein less 

 than its own length distant from anterior cross-vein ; scales on the veins black 

 and white, not evenly intermixed ; costa and first vein white to about the middle 

 and then black, subcosta nearly all white, third vein, forks of fourth, the fifth 

 (except the extreme base) with its forks are black, the other veins white scaled, 

 outstanding scales broadly linear, grey. Halteres with whitish stems and black 

 knobs. 



Legs moderately long and slender ; femora with whitish scales beneath, black 

 and white intermixed dorsally, the black ones heaviest at tip above; knees nar- 

 rowly white ; tibiae pale grey scaled, with a few black ones intermixed ; tarsi with 

 the basal joint grayish-white scaled, the black scales predominating more out- 

 wardly, the other joints wholly bronzy-brown scaled above, silvery grey beneath 

 and laterally. Claw formula, 1.1-1.1-1.1. 



Length : Body about 4.5 mm. ; wing 4 mm. 



