686 MOSQUITOES OF NORTH AMERICA 



AEDES SANSONI Dyar & Knab. " 



Culex cantans Dyar (not Melgen), Proc. Bnt. Soc. Wash., vi, 38, 1904. 



Culex cantans Dyar (not Melgen), Journ. N. Y. Ent. Soc, xli, 36, 1904. 



Mdes vittatus Dyar (in part, not Theobald), Proc. U. S. Nat. Mus., xxxli, 126, 1907. 



Aedes sansoni Dyar & Knab, Can. Ent., xll, 102, 1909. 



Oeioinal Description of Aedes sansoni: 



Closely allied to Aedes suicantans, Felt, but larger and darker in colour, the 

 scales of the wings entirely black, not intermixed brown and whitish on the costa, 

 as they are in A. subcantans. 



Five specimens, Banff, Alberta, Canada. Collected in the summer of 1908. (N. B. 

 Sanson.) 



Type No. 12195, U. S. National Museum. 



Descbiption of Pemau;, Male, and Labva or Aisdes sansoni: 



Female. — Proboscis moderate, subcylindrical, flattened, the labellse conically 

 tapered; vestiture brownish black with a few whitish scales intermixed; setae 

 minute, curved, black, those on the labellfe more prominently outstanding. 

 Palpi rather stout, short, about one-fourth as long as the proboscis, clothed with 

 black scales, the tips and the bases of joints with yellowish-white scales ; setae 

 moderate, black. Antennae with the basal joints somewhat shorter than the 

 distal ones, the second joint larger and thicker and pale at base, the remaining 

 joints rugose, blackish, pilose ; tori subspherical, with a cup-shaped apical exca- 

 vation, luteous, darker and with a patch of small whites scales on inner side; 

 hairs of whorls sparse, black. Clypeus shortly conical, prominent, nude. Eyes 

 black. Occiput blackish, medianly broadly clothed with narrow, curved, white 

 scales and many slender, erect, forked, black scales on the nape ; cheeks clothed 

 with flat white scales and a large quadrate patch of brown ones well up the sides ; 

 bristles bordering the eyes black, a tuft of pale ones projecting forward at the 

 vertex. 



Prothoracic lobes elliptical, remote dorsally, blackish, clothed with pale yel- 

 low scales and black bristles. Mesonotum dark brown, clothed with narrow 

 curved scales, a broad median stripe of golden brown ones, the anterior margin 

 narrowly and the whole of the sides of the disk as well as the antescutellar area 

 with sordid white ones ; bristles moderate, black. ScuteUum trilobate, luteous, 

 each lobe with a group of black bristles and clothed with narrow, curved, sordid 

 white scales. Postnotum elliptical, short, luteous brown, pruinose, nude. Pleurae 

 and coxae pale brown, clothed with elliptical white scales and rows of short pale 

 bristles ; prothoracic epimera white scaled. 



Abdomen subcylindrical, flattened, posterior segments tapering ; dorsal vesti- 

 ture of black scales with a few pale ones intermixed, each segment with a basal 

 band of creamy white scales, on the sides the bands widen into a wide triangular 

 spot especially on the sixth and seventh segments ; first segment with a patch 

 of white scales and many pale hairs ; venter clothed with dvdl white scales, with 

 well defined, elongate, median spots of black ones and lateral apical black spots 

 occasionally forming bands on posterior margins of the terminal segments. 

 Cerci black. 



Wings moderate, hyaline; petiole of second marginal cell somewhat shorter 

 than its cell, that of second posterior cell about as long as its cell ; basal cross- 

 vein less than its own length distant from anterior cross- vein; scales of the 

 veins black, no white ones intermixed ; outstanding scales long, broadly linear, 

 with blunt tipfi. Halteres entirely pale. 



Legs rather slender; femora clothed with white scales below, black and whitish 

 ones about evenly intermixed above, the tips narrowly pale ; tibiae with black and 

 whitish scales intermixed, the black ones predominating at apex, the white ones 

 tending to form a line on outer side of hind pair, the stiff outstanding setae 



