REPORT ON MOSQUITOES. 403 



over area, but no larvae. were found in them on the 21st. At dusk 

 the marriage flight of salinariiis or pipicns was again observed 

 and pert'iirbaus was added to the hst of species found. Intense 

 heat and bright sunshine dried up pool after pool and in those 

 stocked with fish only a few were left floundering in the mud of 

 the deepest holes. 



A very heavy rain on the night of August 25th filled every 

 depression and started brood six, — the heaviest of the season. 

 On the 26th, young larv?e were everywhere and the breeding 

 areas were again explored to determine dift'erences, if any. For 

 the first time lai*vas of Uranotwnia were found in the Cape Marsh. 

 Another heavy rain on the 28th followed by a storm on the 30th, 

 gave the greatest precipitation of the season and life to every 

 possible breeding area. The adults of the fifth brood were about 

 gone and except for pnngens, salinariiis and cnicians in the 

 houses, Cape May was almost mosquito free for the time being. 

 Again the inland and highland pools were collected over and 

 larvae of syhestris were now common ; but no sollicitaus. Psoro- 

 phora and syhestris were found together at one place. 



September ist, Anopheles crucians was found breeding along 

 the marsh in South Cape May, and this species was now a great 

 nuisance, biting even during the day. So dense were the wrig- 

 glers in some of the pools that Mr. Vicrcck determined to fix 

 their number at least approximately. Selecting a pond with an 

 area of 1,894 square feet, he dipped at numerous points with a 

 dipper of known surface, and counted the larvae in each dip. 

 These counts were averaged and, calculating from this, the pool 

 contained 10,636,704 w'rigglers — roughly ten and one-half mil- 

 lion — or 5,616 to every foot of area! 



September 3d, a sphagnum swamp near Sea Isle Junction was 

 carefully collected over because sollicitans abounded there earlier ; 

 but not even a sign of a larva was found. Between Seaville and 

 Swain Anopheles crucians and Cule.v pipicns larvae occurred in 

 the ditches except over sphagnum ground, and no larvae were 

 found in the sphagnum swamps. Conditions on the marshes 

 favored development, so that at this date the larvae were pupating 

 generally and some adults had already emerged. Again the 

 marriage flight of nigritulus was noted, but this time at a height 

 of twenty-three feet, whereas the previous flights had been from 

 six to ten feet up. 



September 4th, adults of sollicitans and tccniorhynclius emerged 

 in force, and the ditched area on Poverty Beach was explored. 

 Not a larva was found anywhere and scarcely an adult in the grass 

 where earlier in the season they swarmed. The .work done had 

 been entirelv efl^ective. On the nth the proprietor of the house 



