OP WASHINGTON. 27 



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Mr. Ulke exhibited and remarked on the following aquatic 

 Coleoptera found by him during the past summer in the Blue 

 Ridge Mountains, near Monterey, Md. : Elmis _eleggjig^i\h- 

 erto considered a rare species, occurred plentifully in a small 

 brook in a short moss, which, intermixed with sand, covered 

 the under side of stones ; Elmis n. sp. , allied to ovalis, found 

 under stones in brooks ; E. nitididus and latiusculus were also 

 quite abundant, and an examination shows that they are evi 

 dently the sexes of one species since they differ only in size and 

 shape ; Cymbiodyta rotunda, of which since the original dis 

 covery by the elder Dr. Melsheimer in the mountains of Penn 

 sylvania, only two or three specimens had been found, occurred 

 plentifully in little pools which were fed by clear, cold spring 

 water. 



Mr. Ulke also exhibited the pale or mature female form of a 

 Phengodes, which occurred abundantly in the mountains of 

 Maryland. 



Prof. Riley said that he was convinced that the specimen 

 exhibited by Mr. Ulke was the true female of Phengodes laticol- 

 lis. He said also that a good deal remains to be learned about 

 'these Phengodes, and particularly how many of the species had 

 the pale, mature larvi-form females. He stated that ten or 

 twelve different species of the female Phengodes are known. 

 Commenting on the local abundance of particular insects, as 

 illustrated by Mr. Ulke's experience, he mentioned as a further 

 example the finding in extraordinary numbers of the larva of 

 Photuris pennsylvanica in a particularly grassy bank near his 

 residence. 



Prof. Riley asked if the food-habits of the larva of Photuris 

 pennsvlvanica are known, to which Mr. Schwarz replied that 

 this point is not positively ascertained, but the supposition is 

 that they feed on snails and insect larvae. 



Mr. Schwarz exhibited specimens of Emphylus americanus, 

 found by Mr. H. G. Hubbard and himself in a colony of For 

 mica sanguinea, near Alta, Utah, at an elevation of about 9,000 

 feet. Mr. Ulke added that he had lately received this species 

 from the Black Hills region of South Dakota and from Colorado, 

 and also mentioned a j^ellow Tachys, found always in the nests 

 of a certain ant. 



