EXPEEIMENT STATION EEPOKT. 679 



no signifer were present. June 35th and July 22cl, periods of one 

 month apart, other visits were made, but no larvse other than triseriatus 

 were taken. 



It may be mentioned that the pool in this tree hole never dries up, 

 no matter how long the drought. It is frequently twelve inches in 

 depth and has never yet been observed with less than six inches of 

 water. 



Mr. Marsh was absent from Chester later in the season, so Mr. 

 Dickerson continued the observations. He visited the tree September 

 6th and found full-grown larvae and pupce of signifier in company with 

 triseriatus as usual, and Anopheles harheri. Several adult signifer 

 were also seen resting on the sides of the tree hole. From the pupae 

 thirty-five adults issued during the seven days following; all but the 

 three first emerging were females, the males having already hatched. 



Culex atropalpus Cbq. (The Eock Pool Mosquito). — No effort has 

 been made to find this species along the rocky banks of the Delaware 

 river in Warren county, where it is supposed to breed; so it still re- 

 mains as only a probable inhabitant of the State. 



Culex canadensis Theob. (The Woodland Pool Mosquito). — The 

 earliest adults hatched April 22d, from pupae collected at Newark, 

 April 8th, and -the latest adults emerged September 11th. Larvae 

 were found at Arlington, April 14th, in company with Anopheles 

 punctipennis, C. territans and C. sylvestris. It has never before been 

 found by us in pools with the first named species. 



Culex niveitarsis Coq. (The Snowy Foot Mosquito). — This species, 

 which is known only by the types, was searched for in its habitat in 

 rocky pools at Paterson, but no specimens in any stage were secured. 

 It is apparently very rare, since it has not as yet been found by any of 

 the other collectors in the United States. 



Culex pallidohirta Grossb. (The Pale-Haired Mosquito). — A light- 

 colored, medium-sized mosquito, with cream-colored, unbanded legs, 

 brownish, unbanded l>eak, and silvery gray, unbanded abdomen. The 

 wings are unspotted and the thorax is pale brown, marked with darker 

 scales on the sides of a narrow median groove, and inclosed in a 

 semicircular lateral line on the posterior half. The latter character 

 can be seen only in bred specimens. 



