170 NEW YORK STATE MUSEUM 



Before setting up this tent we had done some desultory collecting 

 from the bed of this stream, but we had found the immature stages 

 of only a few of the insects that the tent trap revealed. We had 

 found those stone fly and May fly nymphs that live amid the moss 

 that covers the submerged stones [see pi. 9, fig. i]. This is 

 a soil-gathering moss that grows in tufts, so matted together that 

 a bottom layer of fine sand and silt is held closely about the stone, 

 even when it is exposed to the wash of the current. The stone 

 flies of the genus Chloroperla and Leuctra were found in this moss, 

 and the May flies of the genus Ephemerella. There were two 

 species of Chloroperla: the common widely distributed C. bili- 

 n e a t a Say, and another larger, apparently undescribed species. 

 The latter was less abundant, 23 specimens being taken in the 

 tent between July 17 and August 2. Both species climbed up 

 the sides of the tent (the lower edges of which dipped into the 

 surface all around) to transform, leaving their empty skins sticking 

 to the cheese cloth anywhere from a few inches to a few feet above 

 the surface of the water. 



The May fly Ephemerella was also a new species. It is described 

 on a subsequent page as E . d o r o t h e a. Its nymphs lived down 

 between the moss stems on the surface of the soil beds covering 

 the stones. The nymphs of Baetis disported themselves more 

 openly in the edges of the current. These are exceedingly agile 

 little creatures. The nymphs of Heptagenia clung, as is their wont, 

 to the under surfaces of bare stones. 



The caddis flies that appeared in the tent were fewer in individ- 

 uals but they represented a much greater number of species. 

 There were three species of Ryacophilidae ; eight of Hydroptilidae ; 

 two of Sericostomatidae, and one of Limnophilidae. These are 

 all in Dr Betten's hands and will be noticed in his bulletin, now in 

 preparation, on New York Trichoptera. 



The order Diptera was represented by no less than nine families, 

 and two of these, the Tipulidae and Chironomidae, are of very 

 great importance in such situations, while two Psychodidae and 

 Culicidae are of slight importance : this is not the type of aquatic 

 situation suited to their development. In the Tipulidae, the great 

 abundance of three species, Rhaphidolabis tenuipes, 

 Antocha opalizans and Dicranomyia defuncta 

 was especially noteworthy. The Tipula, represented by but two 

 female specimens, remains undetermined. Those put under " mis- 

 cellaneous " in the table were Rhipidia maculata, repre- 



