38 SYNOPTIC KEY 



3(4) With slender, decurved piercing mouth parts, half as 

 long as the body; small larvae living on fresh-water 

 sponges. (Family Hemerobiidae, W, and W., 934.) 

 (Lutz, 53; Comstock, 175.) Order Neuroptera 



4(3) With biting-mouth parts. 5 



5(8) With a pair of prolegs on the last segment (except in 

 Sialis, which has a single long median tail-like process 

 at the end of the abdomen) ; these are directed back- 

 ward and armed each with two or three hooks or 

 claws. 6 



6(7) Abdominal segments each with a pair of long lateral 

 filaments. (Family Sialididae, W. and W., 953.) 

 (Lutz, 53; Comstock 175.) Order Neuroptera 



7(6) Abdominal segments without long, muscular, lateral, 

 filaments; often with minute gill filaments; cylindrical 

 larvae, generally living in portable cases. (W. and W., 

 936; Comstock, 186; Lutz, 57.) Order Trichoptera 



8(5) Prolegs when present on more than one abdominal 

 segment, if present on the last segment, then not 

 armed with single or double claws; often entirely 

 wanting. 9 



9(10) With five pairs of prolegs, and with no spiracles at the 

 apex of the abdomen. (W. and W., 903; Comstock, 

 191; Lutz, 115.) Order Lepidoptera 



10(9) Generally without prolegs; never with five pairs of 

 them; usually with terminal spiracles; long lateral 

 filaments often present on the abdominal segments. 

 (W. and W., 937, adults, 943 for larvae.) (Comstock, 

 494; Lutz, 280.) Order Coleoptera 



11(2) Non-aquatic forms (i.e., not capable of living beneath 

 the water.) 12 



