AEDES CENTROTUS 747 



Keported also from Trenton, Lake Hopatcong and Chester, New Jersey (J. B. 

 Smith); Scott, Arkansas (Thibaiilt). 



We possess specimens from the same locality as Theobald's types of hirsuteron 

 and we have cotypes of Grossbeck's pretans and find that both represent but one 

 species. The species has an unusually southern distribution for a species of this 

 group. It is represented in the northern Rocky Mountain region by A'edes 

 cestivalis, to which it is closely allied, yet apparently distinct on larval characters. 



AEDES CENTROTUS, new species. 

 Desckiption of Femai,e of Aedes centkotus (Mai.e and Labva Unknown) : 



Female. Proboscis rather long and slender, uniform; labellse conically 

 tapered ; vestiture black, with a faint brownish luster ; setae minute, curved, 

 black, those on labellas more prominently outstanding. Palpi short, about one- 

 fifth as long as the proboscis ; vestiture dull black, with scattered reddish-brown 

 scales and a few bristles. Antennas filiform, the joints subequal, rugose, pilose, 

 black; second joint longer than succeeding one, slightly thickened and luteous 

 basally ; tori subspherical, with a cup-shaped apical excavation, brown, rather 

 densely clothed with pale lanceolate scales; hairs of whorls rather short, sparse, 

 black. Clypeus broadly triangular, rounded in front, blackish, nude. Eyes 

 black. Occiput black, clothed with dull ocherous yellow scales, narrow curved 

 ones nearly all over, nape with many creamy-white, upright forked scales, a few 

 blackish ones intermixed towards sides; sides clothed with broad, flat, dirty 

 creamy white scales. Bristles along margins of eyes black, those at vertex paler. 



Prothoracic lobes elliptical, remote dorsally, clothed with yellowish and whit- 

 ish lanceolate scales and coarse black bristles. Mesonotum black, clothed with 

 coarse, narrow curved scales, predominatingly golden brown, becoming more 

 yellowish over the roots of wings and around the antescutellar space ; a rather 

 broad median deep brown stripe, becoming indistinct posteriorly ; a short brown 

 stripe at sides above roots of mngs. Scutellum trilobate, black, clothed with 

 narrow curved pale-yellowish scales, each lobe with a group of pale bristles. 

 Postnotum elliptical, prominent, blackish brown, nude. Pleurae blackish, coxae 

 luteous, with rows of pale bristles, clothed with patches of elliptical, flat, white 

 scales, at anterior angles with narrow, curved golden brown scales. 



Abdomen subcylindrical, tapering posteriorly ; dorsal vestiture black, the seg- 

 ments with rather narrow, basal creamy-white bands, which expand laterally, 

 first segment with dull creamy white scales and with many pale hairs ; venter 

 creamy-white, with broad, apical, segmental black bands which are produced 

 medianly to form a longitudinal stripe. Cerci black. 



Wings moderately broad, hyaline ; petiole of second marginal cell more than 

 half the length of cell, that of second posterior cell longer than its cell ; basal 

 cross-vein distant about its own length from anterior cross-vein ; scales brownish- 

 black, the outstanding ones very narrowly ligulate. Halteres with whitish 

 stem and dark-brown knob. 



Legs slender and rather long ; vestiture black, with faint bronzy luster ; femora 

 pale at base and beneath nearly to tip ; knees narrowly white ; tibias and bases 

 of first tarsal joints sprinkled with paler scales beneath. Claw formula, 

 1.1-1.1-1.1. 



Length : Body about 4.5 mm. ; wing 4.4 mm. 



Type: No. 13281, U. S. Nat. Mus. 



The life-history is unknown. 



Mr. Knab took a series of 30 females that came to bite in the daytime in 

 the forest. 



Forested region north of Lake Superior, Canada. 



White River, Ontario, June 24, 1907 (F. Knab). 



