710 MOSQUITOES OF NOETH AMERICA 



Besides the great differences in the genitalia, sylvicola may be further dis- 

 tinguished from sguamiger by the presence of the cinereous scales on the meso- 

 notum; by the proboscis being uniformly almost black instead of pale brown, and 

 by the much darker colour of the femora and tibiee. 



Described from 21 males and 20 females in the New Jersey Experiment Station 

 collection. 



Habitat: Livingston Park (near New Brunswick), N. J., and Westville, N. J. 



This species was first taken in New Jersey, near Paterson, in April, 1903, in the 

 larval condition; but no adults were bred therefrom. In the following spring they 

 were again met with in Livingston Park, and in the season of 1905 they were secured 

 from this locality in some numbers. They were found full-grown as early as April 

 28th indicating an egg hibernation and the last were taken not later than May 

 17th, though frequent subsequent collections were made. No larvae were ever taken 

 in any but fresh water, woodland pools; and adults were never seen outside their im- 

 mediate breeding grounds. After emergence they continue on the wing for a period 

 of about three months, becoming more and more worn as the season advances. 



An account of the life-history of this species as far as known, and a description 

 of both larva and adult, is given by Prof. Smith in his " Report on Mosquitoes " 

 (N. J. State Exper. Sta., 1903-04), and also a description of the larva in Psyche, Vol. 

 XII, p. 13. 



A description of the genitalia of C. sguamiger is here appended for comparison 

 with G. sylvicola: Clasp elongate, margins sub-parallel almost to apex, inner margin 

 rounding abruptly toward apex; subapical lobe setose; basal lobe well developed, 

 setose, a long spine recurved at the tip arising near it, another stout spine a short 

 distance above this; clasp filament long, curved, four small setae near the apex, with 

 long apical spine. Harpe jointed, basal segment comparatively short, apical seg- 

 ment short, dilated centrally, tip slightly curved. Harpago hood-shaped, tip bent 

 laterally. Appendage of eighth segment with short setae. 



Descbiption of Female, Male, Laeva, and Egg of Aedes geossbecki: 



Female. Proboscis moderate, subcylindrical, uniform, the labellae conieally 

 tapered; vestiture black with some white scales intermixed; setae minute, black, 

 those on the labellae more prominently outstanding. Palpi short, about one- 

 fourth as long as the proboscis ; vestiture of black scales with a few white ones 

 intermixed; setas moderate, black. Antennae moderate, the joints subequal, 

 rugose, black, pilose ; tori subspherical, with a cup-shaped apical excavation, yel- 

 lowish, dark on inner side, with a patch of small white scales; second joint 

 stouter than the others, yellowish at base; hairs of whorls sparse, moderate, 

 black. Clypeus roundedly subconical, blackish with a white pruinosity, nude. 

 Eyes black. Occiput black, broadly clothed with rather broad curved scales, 

 in the middle broadly white and posteriorly with numerous, poorly differenti- 

 ated, forked white scales, at the sides pale brown and with slender, erect, forked 

 black scales ; cheeks clothed with flat white scales inclosing a small patch of black 

 ones well up the sides ; setae along margins of eyes black, those projecting be- 

 tween the eyes pale. 



Prothoracic lobes elliptical, remote dorsally, black, clothed with whitish 

 scales and black bristles, Mesonotum black, densely clothed with coarse, nar- 

 rowly lanceolate scales, white and with a dark pattern, consisting of a median, 

 deep bronzy-brown stripe of very narrow scales, narrow anteriorly and widened 

 at right angles at the posterior third to occupy nearly the whole surface, leaving 

 only a narrow white margin, scales on posterior portion of pattern black ; some 

 white scales around the antescutellar space. Scutellum trilobate, gray, clothed 

 with lanceolate whitish scales, each lobe with a group of black bristles. Post- 

 notum elliptical, prominent, blackish with a white pruinosity, nude. Pleurae 

 brown, coxae lighter, clothed with patches of broad, flat white scales and rows 

 of small pale bristles ; epimera of prothorax clothed with brown scales like those 

 on mesonotum. 



Abdomen subcylindrical, flattened, the posterior segments tapering; dorsal 

 vestiture black with a few white scales intermixed, especially on the apical mar- 

 gins of the posterior segments, each segment with a very broad basal white band 

 of ragged outline and joined to lateral basal patches ; first segment white scaled 



