708 MOSQUITOES OF NOETH AMERICA 



Larva, Stage IV (plate 133, fig. 433). — Head rounded, widest through eyes; 

 antennae moderate, uniform, finely spined all over, a small tuft near middle; 

 both pairs of dorsal head-hairs double, ante-antennal tufts multiple. Lateral 

 comb of eighth segment of about twenty scales in a diffuse patch. Tracheae 

 broad. Air-tube stout, about three times as long as wide, slightly tapered out- 

 wardly ; pecten of evenly spaced teeth reaching over basal, third, followed by a 

 rather large multiple hair-tuft. Aral segment longer than wide, with a large 

 dorsal plate reaching well down the sides; dorsal tuft a long hair and tuft on 

 each side; lateral hair long, single; ventral brush well developed, with small 

 tufts preceding the barred area. Anal gills small, bud-shaped, the lower pair 

 slightly smaller. 



Egg. — Rather thickly fusiform, one side flattened, smooth; micropylar end 

 rounded and with a small annular cushion. White when first deposited, turn- 

 ing deep black. 



Dr. Dyar obtained eggs from captured females on April 26, 1916. The eggs 

 are laid singly. The larvae inhabit the pools on the salt-marshes of the Pacific 

 coast formed by the monthly high tides, having the same habits as those of 

 Aides onondagensis, race qiiaylei, with which they occur around San Francisco 

 Bay. Mr. Quayle says : 



" So far as our acquaintance goes with this mosquito ... it is wholly a salt- 

 marsh form Negative evidence points to the fact that the eggs remain 



over winter and hatch in the following February or March [The adult 



is] migratory, and while it was not found across the hills toward the ocean, as 

 was 0. lativittattis [=A. quaylei], it was found abundantly enough at Burlin- 

 game and San Mateo, and in the hills at least three or four miles from its breed- 

 ing ground [It would seem] that the maximum adult life may be 



three months. . . . The egg-laying may be prolonged for nearly two months 

 after emergence ; altogether, our notes on this species indicate that it is longer 

 lived than the others of this section. Its biting propensities are about as wfeU 

 developed as the brown marsh species [A. quaylei], and the only thing that pre- 

 vents its occupying a place of annoyance equal to 0. lativittatus is that it is 

 fewer-brooded, and consequently less in numbers." 



Mr. Quayle further remarks that the great majority of the specimens that 

 reached the hills did not contain eggs. Dr. Dyar foimd the larvae associated 

 with those of Aedes twniorhynchus in southern California. 



Coast region of California. 



Oakland, August 36, 1903 (I. McCracken) ; Stanford University (V. L. 

 Kellogg) ; Stanford University, April 13, 1903 (I. McCracken) ; San Lorenzo, 

 June 28, 1901 (G. Bisen) ; Nordhoff, May 31, 1904 (A. D. Hopkins) ; San 

 Diego, March 9, 1906 (J. M. French), March 27, April 30, 36, 1916 (H. G. 

 Dyar) ; National City, June 19 to July 1, 1906 (Dyar and Caudell) ; Laguna 

 Beach (C.F.Baker). 



At one time a species from the eastern United States, which was afterwards 

 described as Aedes grossbecki, was confounded with squamiger. Coquillett has 

 established a genus for squamiger on scale-vestiture characters, but there is 

 nothing to sustain it, either in the structures of the imago or of the larva. 



AEDES GROSSBECKI Dyai & Knab. 



Oulex squamiger Smith (not Coquillett), N. J. Agr. Exp. Stat., Bull. 171, 37, 1904. 



Culex squamiger Smith (not Coquillett), Ent. News, xv, 80, 1904. 



Oulex squamiger Smith & Grossbeck (not Coquillett), Psyche, xll, 13, 1905. 



Ouleic squamiger Smith (not Coquillett), N. J. Agr. Exp. Stat., Rept. Mosq., 221, 1905. 



Oulex squamifer Blanchard (in part), Les Moustlques, 630, 1905. 



Aedes grossbecki Dyar & Knab, Journ. N. Y. Ent. Soc, xiv, 191, 201, 1906. 



Culex sylvicola Grossbeck, Can. Ent, xxxviil, 129, 190(j. 



