SPONGILLA-FLIES PARFIN AND GTTRNEY 



Table 6. — Records of parasites attacking Sisyridae 



447 



j *0f approximately 45 cocoons of mainly Sisyra vicaria (Walker) collected by Dr. Spangler in Nigger 

 reek at Mullet Lake, Cheboygan County, Mich., on July 30, 1952, at least 25 were parasitized by Euptero- 

 ialus sp. and one by Tetrastichus sp. The cocoons were collected within an area of about 20 sq. yds., mostly 

 om the tops of Scirpus and Eleocharis stems (a few about 6 in. above the water line, some adjacent to gyrinid 

 )coons). In some instances a blackish mold appeared to have invaded the cocoons. 



' The adults of the Sisyridae can be distinguished from the Hemero- 

 '•iidae as follows: In the Sisyridae, the forewing shows branches of 

 '^s arising from a single Rs stem, whereas in the Hemerobiidae, the 

 orewing shows two or more branches of Rl arising from the appar- 

 ently fused stems of Rl and Rs. The adults of the Osmylidae are 

 b different from the Sisyridae in appearance that there is no diflBculty 

 1 distinguishing them, although the larvae are closely related. The 

 "smylid adult is larger, possesses three ocelli on the vertex, has a 



