Dec, 1907.] Dyar & Knab : North American Mosquitoes. 213 



DESCRIPTIONS OF THREE NEW NORTH 

 AMERICAN MOSQUITOES. 



By Harrison G. Dyar and Frederick Knab, 

 Washington, D. C. 



Aedes campestris, new species. 



9 • — Proboscis straight, clothed with black scales and, on the basal half, with 

 a sprinkling of yellowish gray ones; palpi short, black scaled with lighter scales 

 intermixed ; occiput pale ocher-yellow, a dark brownish stripe on each side of the 

 median area, margins of the eyes lighter scaled, collar dark scaled ; prothoracic lobes, 

 pleura and coxoe roughly yellowish white scaled; mesonotum ochreous yellow, a 

 broad rich brown stripe down the middle, basally two short brown stripes on each 

 side of this ; shoulders broadly marked with brown ; scutellum pale ochreous scaled, 

 the setae pale shining yellow ; abdomen dull yellowish white scaled, the second, third, 

 fourth and fifth segments with large patches of black scales on each side of the middle, 

 reaching the apex but not the base, these patches have a few whitish scales intermixed, 

 on the succeeding segments these patches are indicated by a slight sprinkling of black 

 scales, beneath the abdomen is entirely yellowish white scaled ; legs with femora and 

 tibise pale ochreous yellow scaled with a sprinkling of black scales, which becomes 

 heaviest towards the apices of the tibiae, first tarsal joint yellowish scaled sprinkled 

 with black, the black becoming heavier towards the apex, the apex ringed with yel- 

 low-white, second third and fourth joints blackish above, ringed at both ends with 

 yellowish white, the last joint entirely yellowish white, the tarsi show a brassy luster 

 which tends to obscure the markings, on the fore tarsi the markings are more or less 

 obsolete ; wing-veins clothed with narrow dull yellowish white scales with a slight 

 sprinkling of black ones. Claws all toothed. Length, 5 mm. 



$ . — Palpi about as long as the probroscis, clothed with yellowish and dark 

 scales intermixed, the pale scales predominating, the apical half with lateral long 

 dense ferruginous and brown hairs with silky luster; antennae rather short, densely 

 plumose, the hairs pale brown and ferruginous with silky luster ; abdomen long, 

 depressed on the apical half, clothed with dull yellowish white scales, the lateral 

 hairs abundant, pale yellow with silky luster. Length, 5.5 mm. 



Fourteen specimens, Oxbow, Saskatchewan, Canada (F. Knab) ; 

 Regina, Carnduff and Qu'Apelle, Saskatchewan, Canada (T. N. 

 WilHng, through Dr. J. Fletcher) ; Elsinore, Utah (E. S. G. Titus) ; 

 Salt Lake, Utah (H. S. Barber). 



Type. — No. 10874, U. S. National Museum. 



Aedes riparius, new species. 



9 . — Proboscis slender, dark scaled with a sprinklingof lighter yellowish scales- 

 particularly towards the base ; palpi short, dark scaled, with the apex and the median 

 segment lighter scaled ; occiput yellow scaled with brassy luster, a large brown spot 



