Vol. XXVJi] ENTOMOLOGICAL NEWS. 2/3 



with five second moult larvae and ten first moult larvae of the 

 mosquito Aedes cant at or. In the preparation of these experi- 

 ments Mr. Raymond Patterson not only determined the spe- 

 cies, but aided in the preparation of the jars of solution. 



In the series running down from 13 per cent., it was noted 

 that the larvae died rather quickly in the distilled water and in 

 the higher per cents. In the series graduated from 16 per 

 cent, up to 35 per cent, salt, all larvae died in the 22 per cent, 

 jar and above in two days. Just as the records of these pre- 

 liminary experiments were being considered and plans were 

 being made for a more extensive series, the writer was in- 

 vited by Mr. Patterson to go on a collecting trip to the marshes 

 of Port Mon mouth. On this trip we took records of the salin- 

 ity of numerous pools, some of which contained no larvae. 

 Two pools in particular engaged our attention. One with a 

 temperature of 64 F. and a salinity of 22 per cent, contained 

 many larvae of the species Acdes sollicitans of the second 

 moult ; the other pool, not ten feet away and similar in size, 

 depth and character of bottom, with a temperature of 67 F. 

 and a salinity of 24 per cent., contained no larvae at all. While 

 probably of no great significance, the observation seemed at 

 the time most important in the light of the preliminary ex- 

 periments performed in the laboratory. Accordingly Mr. Pat- 

 terson and the writer decided to carry on a large series of ex- 

 periments to discover the effects of high salinity on the via- 

 bility of mosquito larvae at different stages. Mr. Patterson 

 was shortly forced to discontinue his work, but has aided 

 substantially by furnishing larvae and field notes as well as 

 by advice and information. 



The records furnished by Mr. Patterson, Mr. H. I. Eaton 

 and others indicate clearly that in the field Aedcs sollicitans 

 Wlk. lives and thrives in marsh water of a higher salinity than 

 that which seems favorable to Acdes cantator Coq. 



Extensive experiments carried on by the senior author show 

 clearly that under laboratory conditions the viability of the 

 larvae of the salt marsh mosquitoes in salt water depends not 

 only on the salinity of the water from which they were taken, 

 but also depends upon the species of larva. While rains may 



