746 MOSQUITOES OF NORTH AMERICA 



except toward the suture, a row of stout spines on inner edge, a brush of long 

 hair at the tip ; outer half with a fringe of little hairs next the suture above, 

 an irregular patch below, two filaments adjacent to the suture at the middle, a 

 spine on the other side, a row of serrations on margin next the palpus ; palpus 

 short, thick, with four minute terminal digits and a central rounded elevation. 

 Thorax rounded, transverse, wider than long, hairs rather abundant, moderate, 

 the subdorsal prothoracic hairs a small tuft followed by a single long hair. 

 Abdomen stout, rather long, the anterior segments shorter; hairs sparse, the 

 laterals double to fifth segment, single on sixth; secondary hairs moderate; 

 tracheal tubes broad, band-shaped, expanded in the segments. Air-tube stout, 

 slightly tapered on apical half, about three times as long as wide ; pecten reach- 

 ing to middle, uniform, without detached teeth ; pecten tooth a long spine with 

 broad base and a basal branch; a single tuft of about five hairs following the 

 pecten. Lateral comb of eighth segment of rather numerous scales in a patch ; 

 single scales broadly elliptical, fringed outwardly with short spines and with 

 a single long stout apical spine. Anal segment about as long as wide ; dorsal 

 plate reaching near the ventral line, with an even margin ; dorsal tuft a brush and 

 rather long hair on either side ; ventral brush well developed, with short tufts 

 preceding barred area towards base ; a single small lateral hair ; anal gills mod- 

 erate, ensiform, about twice as long as anal segment. 



The larvse develop in the pools of early spring from overwintering eggs. 

 There is but one brood in the season. Britton and Viereck, in Connecticut, 

 found this species in great abundance ; they say : 



" Has formerly been regarded as a comparatively rare woodland species. At 

 Hartford we found it breeding by the million in wooded pools at south meadows, 

 from which it spread into the adjoining portion of the city, becoming the most 

 troublesome mosquito." 



In 1905 Dyar and Knab visited the locality on the outskirts of Hartford indi- 

 cated by Britton and Viereck. On April 25th the brood was already well 

 advanced and pupae predominated over larvse. Associated with them were a few 

 larvge of Aedes fuscus, these being still small. The appearance and development 

 of the larvae of Aedes hirsuteron, according to our experience, is about coin- 

 cident with Aedes canadensis, the former, however, being much more local. 

 Smith reports the species as rather rare in New Jersey and captures of adults as 

 late as September 10th and 16th. We have well preserved specimens taken in 

 July and August, which indicates that, as in other species overwintering in the 

 egg state, a part of the eggs fail to hatch in the spring and do so later, when the 

 pools are again filled by rains. Thibault observed the species in Arkansas and 

 says: 



" An early mosquito, sometimes abundant in suitable places. In thickets and 

 grassy places and about dwellings. Does not enter houses. Breeds in transient 

 grassy pools in fields and thickets. An eager biter. Taken in March, April, and 

 May, and after rains throughout the summer, though only sparingly after May. 

 Males appear first and are at all times more plentiful than females." 



Eastern United States, from New Hampshire southward to Texas. 



Dublin, New Hampshire, June, 1905 (A. Busck) ; South Amherst, Massa- 

 chusetts, July 10, 1903 (G. Dimmock) ; Westfield, Massachusetts, July 14, 1903 

 (F. Knab) ; Chicopee, Massachusetts, July 8, 1903 (F. Knab) ; Hartford, Con- 

 necticut, larvas April 25, 1905 (Dyar and Knab) ; Great Piece Meadow, New 

 Jersey, April 27 (J. B. Smith coll.) ; Herzog's Island, Potomac River, Mary- 

 land, April 26, 1903 (W. V. Warner) ; Woodstock, Virginia, June 2, 1903, 

 August 4, 1904 (F. C. Pratt) ; Paris, Texas, April 4, 1904 (A. A. Girault). 



