736 MOSQUITOES OF NORTH AMERICA 



Oeiginal Desckiption of Af.des aldrichi : 



Similar to A. hirsuteron Theobald and A. wstivalis Dyar, but the vestiture of the 

 occiput and the sides of the disk of the mesonotum are frosted white with a very 

 slight yellowish cast; the anterior angles of the mesonotum are not brown-scaled; 

 the abdomen has a distinct bronzy luster; the stems of the forked cells are longer; 

 the species is smaller; otherwise the three species are very similar. Length, 3.5 mm. 



Six specimens, all females. Market Lake, Idaho (J. M. Aldrich). 



Type. Cat. No. 12010, U. S. N. M. 



The specimens were sent us by Professor Aldrich mixed with A. idahoensis Theo- 

 bald. Aldrich's remarks, quoted by Theobald,* obviously refer to this small species 

 and not to idahoensis, which is larger. We take pleasure in naming this species for 

 Prof. J. M. Aldrich. 



*Mon. Culicid., iii, 1903, p. 250. 



Descbiption of Female of Aedes aldrichi (Male and Labva Unknown) : 



Female. Proboscis moderately long and slender, cylindrical, uniform, the 

 labellge conically tapered ; vestiture black ; setae minute, curved, black, those on 

 the labellas more prominently outstanding. Palpi short, about one-fifth as long 

 as the proboscis ; vestiture black with faint bronzy luster ; seta moderate, bristly. 

 Antenuse with the joints subequal, rugose, pilose, black, second joint longer 

 than the succeeding one, slightly thickened and paler, partly covered with shin- 

 ing yellowish-white scales ; tori subspherical, with a cup-shaped apical excava- 

 tion, luteous brown, darker and with a patch of shining yellowish-white scales 

 on inner side; hairs of whorls moderate, sparse, black. Clypeus broad, trian- 

 gularly rounded, prominent, black, nude. Eyes black. Occiput black, broadly 

 clothed with narrow curved scales, on the sides with broad flat ones, silvery 

 white with a very faint yellowish tinge, without lateral dark patch, many short, 

 erect, pale, forked scales on the nape; bristles along margins of eyes black, 

 those projecting between eyes pale. 



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

 scales and dark bristles. Mesonotum black, clothed with narrow curved scales, 

 a broad median stripe and small subdorsal posterior stripes of bright bronzy- 

 brown scales, those along anterior edge, sides of disk, and covering the antescu- 

 tellar space yellowish white, the anterior angles not differently colored ; dorsal 

 stripe divided by a narrow line of pale scales. Scutellum trilobate, black, 

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

 pale bristles. Postnotum elliptical, prominent, blackish brown, shining, nude. 

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

 and rows of pale bristles; scales on epimera of prothorax narrow, yellowish 

 white. 



Abdomen subcylindrical, flattened, tapering posteriorly; dorsal vestiture 

 black with a slight violet and bronzy luster, with narrow white basal segmental 

 bands slightly incised at the middle and widening to triangular patches on the 

 sides; first segment with a patch of white scales and many pale setaB; venter 

 sordid whitish scaled. Cerci black. 



Wings moderate, hyaline; petiole of second marginal cell shorter than its 

 cell, that of second posterior cell about equal to its cell ; basal cross- vein distant 

 about its own length from anterior cross-vein ; scales brown, black on costa, the 

 outstanding ones broadly linear. Halteres whitish, the knobs infuscated. 



Legs rather long and slender; femora whitish scaled basally and below, with 

 bronzy-black scales above and a black ring before the tip ; knees shining white ; 

 tibiae largely yellowish white scaled below, bronzy black above, tips of hind pair 

 black ; tarsi brownish-black scaled, the basal joint with many pale scales beneath, 

 becoming fewer outwardly, terminal joints entirely black ; on hind tarsi the pale 

 scales have a silvery luster and are continued to near the middle of the second 

 joint. Claw formula, 1.1-1.1-1.1. 



Length : Body 3.5 mm. ; wing 3 mm. 



