EXPERIMENT STATION REPORT. 639 



sylvestris. St. Cloud to Montclair, seven sylveslris, one cantator. 

 The dominance of the salt marsh fauna is well shown in this 

 collection, but the migration was not then completed, as was found 

 August 27th, when one hundred and fifty soUicitans and twenty 

 cantator were taken at Millburn, as against two sylvestris and 

 nine pipiens. On the South mountain, on the same day, were 

 fourteen soUicitans, nine cantator, six sylvestris and one Janthin- 

 osoma musica. At Springfield, there were some pools and in them 

 larvec of sylvestris, pipiens and Anopheles were found. 



September 4th, Springfield was still breeding the species above 

 named and many larvse were taken. SoUicitans and cantator were 

 yet the dominant species, but the examples were beginning to look 

 much worn, while sylvestris, which was the only other species 

 taken, was very fresh and clean. 



September 20th, practically all the breeding places in the entire 

 area were dry, the salt marsh species had disappeared and only 

 five sylvestris and one pipiens were taken during the day. The 

 trip Avas made to verify the conclusion that marsh brood 7 was a 

 stay-at-home, and that no migration had taken place. 



September .24th and 25th, Messrs. Grossbeck and Brehme 

 tramped the entire area .under observation, and in the two days 

 found only a single adult C. sylvestris and no larvse at all. In the 

 Springfield area of Millburn the stream bed, which had been 

 broken up into pools earlier in the season, was now full, and no 

 more breeding was going on. jSTothing was found in any of the 

 pot holes, and the swamp areas were all safe. 



October 9th, matters were found in an equally good condition, 

 so far as breeding is concerned, and in the day's search only five 

 adults were met with, all C. pipiens. 



October IBth, I went over the area myself with Messrs. Brehme 

 and Grossbeck to verify the conclusions that they had reached, 

 and to be able to speak of the character of the area from personal 

 knowledge. The ''pot holes" I found like those I had known in 

 other places and none of them contained larvae. From two of them 

 that Avere dried out, or nearly so, a pail of surface soil was 

 gathered, a shaving one-quarter inch, or a little more, being taken 

 so as to include the decayed leaves and the mud surface just be- 

 neath them. This was carefully examined later, in the laboratory, 

 and mosquito eggs were found imbedded in it. These eggs were 

 like those of soUicitans, but distinctly larger, and therefore were 



