200 THE MOSQUITOES OF NEW JERSEY 



where dilation scarcely perceptible. Double row of spines does not 

 extend half length of siphon, consists of but three to five spines in each 

 row, with small teeth crowded at base, often on both sides. In young 

 larvae ringed near middle, the basal half whitish, apical half dark 

 gray. Ninth segment longer than broad, with small barred area on 

 ventral part of posterior margin from which arise rather short tufts 

 of hair, and smaller tufts on ventral margin beneath barred area. 

 Dorsal tufts short, each with one hair much longer than rest. Anal gills 

 long, taper to fine point with trachea mere hair line, to be seen in living 

 larvae. 



HABITS OF THE EABI.Y STAGES 



In New Brunswick the only breeding places known are on the College 

 Farm, where, in woodland pools, a few specimens were taken, and two 

 or three small temporary lot pools not far from my house. In the 

 woods the species was associated with vexans, atlanticus, and P. ferox; 

 in the lot pools with pipiens and territans. The lot pools were located 

 in 1902, and these wrigglers could be found there at almost all times 

 after the last days of July. In 1904 the same pools were collected over 

 July 28, and some thirty full grown larvae were found associated with 

 thousands of C pipiens, which were collected for experimental pur- 

 poses. On July 30, another lot was brought in, mostly in the pupal 

 stage. August 9, the pools were again loaded with full grown larvae 

 and pupae, and as specimens were needed and the pools were small, 

 on the tenth they were collected clean. At that date there were no 

 larvae, and the effort was to clean out the entire crop. August 17 the 

 pools were again filled by larvae of alf sizes up to the pupal stage, mak- 

 ing less than seven days from the hatching of the egg to the pupal 

 stage. The latter stage rarely lasts over twenty-four hours, so that a 

 brood may come to maturity in a little over one week. August 23 all 

 stages were again found, from young just out of the egg to the pupa. 



These pools do not really differ from dozens of others in the city, 

 and even in the vicinity, where the species does not occur. One of them 

 becomes very foul occasionally from a sewage admixture and this 

 seemed in no wise to discompose the insects. The others have the ordi- 

 nary shale mud bottom with little or no vegetation. The larvae some- 

 what resemble those of Psorophora at sight and, as they always oc- 

 curred with pipiens, it was believed that they might be predatory ; but 

 a series of experiments failed to bear out this belief. 



Professor Glenn W. Herrick, of Mississippi, described this larva in 

 1904 and detailed some of its habits, which it may be interesting to 



