March, I9I3-] GrOSSBECK : MOSOUITOES AND ENVIRONMENT. 61 



numbers only because wooded districts are there here in number and 

 of less extent. Culex atropalpus which breeds in rock pools is found 

 in Massachusetts and Connecticut and again along the Potomac 

 River in Maryland. New Jersey is apparently passed by because she 

 has no suitable rock pools to offer, her shores being made up of sands 

 and marshes. tVyeomyia smithii is found in the leaves of the pitcher 

 plant wherever this plant occurs, be it in the cedar swamps of south- 

 ern New Jersey or the bogs of Warren Co. in the north of the state. 

 Culex triseriatus and signifer likewise are found wherever tree cavi- 

 ties contain water for a considerable time. Culex dyari, it is true, 

 while it may not be rare in the mountains in the northwest corner of 

 the state will probably not be found in the lowlands in the south of 

 the state; it seems to be a mountain species, and perhaps the exact 

 conditions for it are not to be found except in the mountains. Culex 

 melaniinis, also, has so far been found only in the cold spring-fed bogs 

 of South Jersey. Culex pcrturhans, on the other hand, is common in 

 all portions of the state, low and high, where permanent swamps 

 thickly overgrown with vegetation occur, and similarly Culex aurifer 

 occurs in the more permanent woodland water areas along the cran- 

 berry bogs of the south and along the edge of Lake Hopatcong and 

 other large ponds and lakes in the north. Anopheles crucians of the 

 salt marsh is seemingly a more southern species, being always present 

 in Cape May, less so in the vicinity of Barnegat Bay and positively 

 rare around Perth Amboy and Elizabeth. Culex tccniorhynchus like- 

 wise has a tendency in this direction, being apparently a more south- 

 ern species; yet occasionally it is met with in large swarms on the 

 meadows of Long Island Sound. 



Only two species known to me are given to breed in two distinct 

 environments. These are Culex sylvestris and ALdes fuscus. The 

 first of these is typically an open swamp species, but in the spring of 

 the year is found in comparatively small numbers in typical woodland 

 pools. The individuals from these woodland districts are smaller and 

 darker than those produced later from the open swamps. The second 

 is essentially a woodland species, but is occasionally found in num- 

 bers in open swamps, the converse of sylvestris. In this instance no 

 differences are manifest between the adults produced in the different 

 environments. 



