REPORT ON MOSQUITOES. 401 



July 15th, the search was continued further inland; but in 

 three fresh water swamps not a larva was found, while in the salt 

 hay zone every pool was full of them. The area between Ben- 

 nett's and the marsh was especially explored, and the relation 

 between the presence of certain grasses and soUicitans breeding 

 grounds was fully investigated. The thorough exploration of this 

 area was of the utmost importance because it left no question as 

 to the limitations of soUicitans breeding areas, and no room for 

 further dread of the fresh water swamps as mosquito purveyors. 



July 16, experiments with killies were continued and several 

 pools near Cape May were stocked with them. The fourth 

 brood was now in full swing and the fish had an excellent oppor- 

 tunity for showing what they could do. The details of these 

 experiments are elsewhere given. 



July 17th and i8th were spent in continuing the fish experi- 

 ments and in watching the race between developing larvae and 

 drying pools — millions of wrigglers dying because the water 

 evaporated forty-eight hours too early. 



July 19th mosquitoes were found in immense numbers near 

 Hammonton and at Da Costa, in the grass and bushes. Most of 

 them were sotiicitans; but there was a fair sprinkling of can- 

 tator ; all of them were females without eggs. Not a wriggler 

 was found in the swamp pools where these adults occurred by the 

 thousands. 



July 19th and 20th some of the fish experiments were brought 

 to a conclusion, the larvae were found read}^ for the change to 

 the pupal condition and some adults from this fourth larval 

 brood were already on the wing. It was noted that the 

 Anopheles crucians and Culex salinariiis were the house mos- 

 quitoes, while soUicitans rarely got into the rooms. 



July 22d adults were emerging in swarms from what Mr. 

 Viereck called the July 13th brood of larv?e; and now Culex 

 tcuniorhynchus began to be quite common. On the 23d, similar 

 conditions were noted near and at Anglesea. and collections were 

 made evervwhere to determine the relation of the two species. 



An elaborate series of experiments was begun at this time and 

 continued through the balance of the season, to learn the condi- 

 tions under which the adults will lay eggs and the circumstances 

 under which they will hatch. Mosquitoes became very plentiful 

 at Cape May during these last days of July, but Anopheles cru- 

 cians, whose breeding place had now been located, and Culex 

 salinariiis, were still the dominating indoor forms. Every day 

 some new locality was explored or some question of habit was 

 determined. 



26 MOS 



