REPORT ON MOSQUITOES. 359 



the yellow ones chiefly on the apical and basal portions of the 

 veins, and at the forks, but more or less mixed with the black 

 ones, and it is difficult to determine where one leaves off and 

 where the other begins; as a whole the wings have a mottled 

 appearance. 



The abdomen of the female is uniformly blackish brown, with 

 yellowish hairs scattered over the surface ; but in the male it has 

 yellowish ill-defined bands at the base of the segments, rather 

 broad on the anterior, narrower or entirely lost on the apical 

 rings. 



Habits of the Adult. 



Specimens resembling and probably identical with this species 

 have been taken in general collections made by me at Lahaway in 

 years past; none were saved, however and none were collected 

 during this investigation. The insect is really rather a hand- 

 some one and, as it does not bite, need not be considered at 

 length. All the adults in our collections were bred. 



Description of the Larva. 



The larva with the anal siphon greatly enlarged is figured on 

 page figure iii, 4 and 5. When full grown it averages 8 mm., 

 =.32 of an inch in length and is of a pale, partly translucent, 

 reddish brown color with the head and anal siphon more strongly 

 chitinized than in S. alhipes. The head is dirty brown, compar- 

 atively much smaller than the thorax, and when viewed from 

 above is broadest at the eyes, narrowed anteriorly and with two 

 lateral projections in front, from which depend the antennae 

 The antennae are rather short, with four long spines of equal 

 length at the apex, curved inwardly. The thorax is rounded, 

 very large and thick, with the first pair of air sacs very faintly 

 visible beneath the integument; small hair tufts are on the lat- 

 eral margins and a few others on the dorsal surface. The ab- 

 dominal segments are sub-ec|ual in length, but narrowing pos- 

 teriorly, each with short lateral hair tufts and the air sacs of the 

 seventh segment are, like those on the thorax, barely discern- 

 able. At the posterior margin of the eighth segment is situated 

 the slender anal siphon, which is about four and one-half times 

 as long as its greatest width, slightly dilated centrallv and tap- 

 ered apically. The anal segment is somewhat like 5. alhipes, 

 with a ventral fan of branched hairs issuing from a serrated 

 ridge, and two small tufts of long simple hair above the tracheal 



