Vol. xxiv] ENTOMOLOGICAL NEWS. 21 



Gerris gillettei L. & S. 

 =Limnotrechus prodiictus Uhler. Hem. of Colo. 



One female specimen from Garfield, Utah, on brackish 

 water. This agrees in every particular with the original de- 

 scription and with the type in the collection of the Colorado 

 Agricultural Experiment Station of Fort Collins, kindly loan- 

 ed to me for study by Prof. C. P. Gillette. This is the first 

 authentic record of the species since it was first described, and 

 serves to establish its character as a good species. Its chief 

 superficial character separating it from Gerris (Limnotrechus} 

 marginatus Say, lies in the anal cerci, which in marginatus 

 are short and comparatively stout, while in gillettei they are 

 long, attaining the extremity of the abdomen and comparative- 

 ly slender. 



Gerris robustus Uhler. 



Four apterous males and one female, and one winged male 

 and one female, from Highland Springs, California. Prof. 

 Aldrich writes thus about the locality : "The springs that give 

 the name to the place come out a short distance from the sani- 

 torium, and I ran down there with my net. There are per- 

 haps twenty springs, all carbonated that I saw, and they make 

 quite a little stream. On this there were a few skippers, and I 

 got half a dozen, all short winged but large. These were all I 

 could get for you. They were collected about ten miles from 

 Clear Lake, and as near as I can remember they were the only 

 skippers I saw on the trip." 



It may be readily seen from the preceding that while not 

 from the very place whence Uhler got his single female type, 

 it was sufficiently near to act as a type locality, given the 

 wide spread of the Gerrids, which are great travelers. The 

 winged female in structural characters agrees with Uhler's 

 description, but not so in color, as I shall explain more at 

 length elsewhere. The species is a widespread Western form, 

 which has come into my hands from various other sources. 

 Several of the specimens had an alkaline crystalline accretion 



