MOSQUITO BIOLOGY 125 



one long spine, two shorter ones and little articulated peg. Eyes black, 

 comparatively small, divided into two parts ; large crescent-shaped 

 piece and very small one in concavity ; sometimes encircled by broad 

 white ring. Rotary mouth brushes yellow, pectinated at tips of more 

 central hairs. Mentum triangular with ten or eleven teeth on each side 

 of apex, which become larger toward base ; considerable variation, 

 chiefly in curve of sides, as shown in Fig. XL. Mandible normal with 

 small spines scattered near base. Maxillary palpus short and chunky, 

 with small apical tuft and large basal joint. 



HABITS OF THE EARLY STAGES 



Larvae nearly full grown were collected on the outskirts of Newark 

 March 28 and April 2. The first pupa appeared April 3, the first adult 

 on April 6, and others continued to appear until April 12. Full grown 

 larvae and pupae were collected at Morristown, May 1, and adults be- 

 gan to issue from these May 3. In both collections canadensis predomi- 

 nated and so far as our information goes the habits of the early stages 

 are the same in both. Collections with larvae of that species were made 

 also at Arlington, Cranford, Elizabeth, and Preakness Mountain, all 

 in April or very early May, and it is probable that throughout the 

 more northern part of the state stimulans and canadensis occur to- 

 gether in early spring. It does not occur anywhere in the pine belt so 

 far as we know. 



A peculiarity of the larvae is that they favor the deeper pools and 

 feed and hide among the dead leaves covering the bottom. This renders 

 collecting rather a tedious task and makes it easy to overlook them on 

 a surface examination because they rarely come to the top and do not 

 stay there long. The pupae, however, are always at the surface, as in 

 allied forms. 



Aedes triseriatus Say 

 The Tree-Hole Mosquito 



DISTRIBUTION AND CHARACTERIZATION 



[United States east of the Rocky Mountains. In New Jersej'^ 665 

 females have been trapped.] 



Small or medium sized, with black, unhanded legs and beak ; sides of 

 thorax silvery white, grayish on dorsum, leaving well defined central 

 stripe, which becomes wide posteriorly. Abdomen black, with white 

 lateral marks, encroaching upon dorsal part at bases of apical two or 



