REPORT OX MOSQUITOES. 345 



"have found them only in 1904 and then not common. Just why 

 they should not occur there so abundantly I am unable to say, 

 unless these northern swamps are enough colder in summer to 

 prevent free development. 



Nothing has been observed as to the length of adult life and 

 nothing is known of their feeding habits. Mr. Brakeley has 

 seen them apparently ovipositing during the day, but never in 

 large numbers. I have never found them on flowers and the 

 inference is that they are, under ordinary conditions, active only 

 at night. 



There is little or no difference in appearance between the sexes. 



Description of the Larva. 



The larva is illustrated on figure 109 with details of structure. 

 When full grown it averages 5-6 mm.,=.20-.24 of an inch 

 in length excluding the anal siphon, though many specimens at- 

 tain the length of 7 mm. In color they are creamy white with 

 the head slightly darker. The head is rounded, pentagonal and 

 almost as long as broad. The antennas (fig. 109, 3) are small, 

 uniformly pale brown, the tuft represented by a single hair 

 v/hich issues from the shaft slightly over one-fourth its length 

 from the apex ; the apex with several small spines and one longer 

 one. The eyes are very small, round, but often (especially in 

 large larvae) have a crescent shaped mark immediately before it. 

 The rotary mouth brushes (fig. 109, 5) are bright yellow, the 

 hairs composing them being pectinated at their extreme tips and 

 the mentum (fig. 109, 2) is broadly pentagonal in form, con- 

 cave at the base, with a large apical tooth and from seven to 

 ten uniform smaller ones on each side; nine being the usual 

 number. The palpus (fig. 109, 4) is longer than wide with a 

 rudimentary apical tuft, a stout basal joint, and a row of acutely 

 pointed processes on one side. The mandible (fig. 109, 6) is 

 shaped as in Culex, but has only a single curved dorsal spine 

 and is excavated between this spine and the apex. The thorax 

 is quadrate, broader than long, has sinuous lateral margins, each 

 with three groups of long hair tufts, and there are several short 

 ones on the anterior and posterior margins. 



The abdomen is slender, the segments similar, with long lat- 

 eral hair tufts of four or five hairs to each tuft in the anterior 

 segments, and two or three in the posterior ones. A number of 

 shorter tufts below and above these long ones are on each of 

 the segments. The lateral combs of the eighth segment con- 

 :S.ist, each, of eleven to fifteen scales arranged in a single row, 



