AEDES ALDEICHI 735 



nal tufts multiple. Mental plate triangular, with a central tooth and thirteen 

 on each side, the basal ones stouter and slightly more remotely spaced. Mandible 

 quadrangular, with short spines at base ; two filaments before tip ; an outer row 

 of long cilia ; eleven filaments on outer edge ; dentition of four teeth on a proc- 

 ess, the first longest; a sharp spine and a blunt tooth before, a broad serrate 

 filament and five slender ones within; process below furcate, stout, a row of 

 hairs outwardly; basal angle prominent; a row of stout hairs within, a row of 

 longer ones at base. Maxilla irregularly hemispherical, divided by a suture; 

 inner half with a row of stout erect spines, two rows of cilia and some spines 

 near the suture, a row of long hairs at tip ; outer half with two filaments rather 

 remote from the suture, situated beyond the middle, a spine on the other side; 

 palpus stout, short, wide in proportion to maxilla, with four minute apical 

 digits. Thorax rounded, wider than long ; hairs abundant, moderate. Abdomen 

 moderate, anterior segment shorter; lateral hairs double to fifth segment, single 

 on sixth. Tracheal tubes rather broad, band-shaped. Air-tube stout, slightly 

 tapered, over three times as long as wide; pecten reaching nearly to middle, 

 the teeth evenly spaced, followed by a multiple hair-tuft; single tooth a long 

 spine with wide base, a stout basal branch, and two or three small teeth. 

 Lateral comb of eighth segment of many scales in a triangular patch; single 

 scale bluntly rounded with pointed base, fringed with spinules, the apical ones 

 of nearly equal length. Anal segment slightly longer than wide ; dorsal plate 

 reaching two-thirds of the way down the sides, straight on lateral margin; 

 dorsal hairs a brush and hair on either side ; a single lateral hair ; ventral brush 

 well developed, with short tufts preceding barred area toward base. Anal gills 

 moderate, ensiform, as long as the segment or longer. 



The larvffi occur in the early spring in temporary pools in company with the 

 other species with similar habits. The eggs no doubt hibernate on the ground. 

 The females form part of the swarm of mosquitoes frequenting the forests during 

 the first half of the summer, and, like the other species, live for two months or 

 longer and disappear by August. These specimens, when flown, can not longer 

 be distinguished specifically from other species with black legs, such as Aedes 

 abserratus, impiger, trichurus, and provocans. 



Canada and northeastern United States. 



Elizabethtown, New York, June 11, 1904 (E. P. Felt) ; Earner, New York, 

 May 13, 1904 (E. P. Felt) ; Plattsburg, New York, larvce April 20, 1905 (H. 

 G. Dyar) ; Mount Washington, New Hampshire (Mrs. A. T. Slosson) ; Dublin, 

 New Hampshire, May, 1909 (A. Busck) ; White Eiver, Ontario, June 25, 1907 

 (F. Knab); Field, British Columbia, August 15, 1903 (H. G. Dyar). 



The coloration is subject to some variation. The abdominal pale bands are 

 narrow in some specimens. In many specimens the pale scales of the head and 

 mesonotum are uniformly oeherous yellow instead of being paler at the sides and 

 posteriorly. In some specimens the short brown stripes at the sides of tlie ante- 

 scutellar space are obsolete. Doctor Felt states that in the female the outer 

 claw of the fore leg is simple (Bull. 79, N. Y. State Mus., 311, 1904). Our 

 specimens, including a cotype, have both claws of the fore legs alike and each 

 with a distinct tooth. 



We have a single specimen from Field, British Columbia, that much resembles 

 the specimens from Lake Superior, but owing to the fact that we have neither 

 males nor larvge of this form, and to the considerable geographical interval 

 between the localities, we hesitate to make the identification positive. 



AEDES ALDRICHI Dyar & Knab. 



Grabtiamia spencerii var. idahoensis Aldrich (not Theobald), in Theobald, Mon. 



Culicid., lii, 250, 1903. 

 Aedes aldrichi Dyar & Knab, Proc. U. S. Nat. Mus., xxxv, 57, 1908. 

 Aedes aldrichi Theobald, Mon. Cullc, v, 620, 1910. 



