CADDIS-FLIES 267 



DIVISION II 



^QUIPALPIA 

 Maxillary palpi always five-jointed, and with 

 few exceptions similar in form in both sexes. 



Leptoceridae. — Palpi (maxillary understood) strongly 

 hairy, ordinarily ascending, and with the last 

 joint usually long, but simple, although often 

 flexible. Wings very pubescent, and for the most 

 part narrow. Antennae, as a rule, very long and 

 slender. The case of the larva tubular, and free. 



HydropsychidcB. — Palpi long, and more or less deflexed, 

 the last joint whip-shaped, and composed of 

 numerous minute jointlets, slightly pubescent, 

 wings pubescent. Antennae variable. Case of 

 the larva fixed ; the pupa not enveloped in a 

 special cocoon. 



Rhyacophilidae. — Palpi deflexed, joints cylindrical, rarely 

 hairy, the last joint similar in form to the others. 

 Wings variable in amount of pubescence. Case 

 of the larva fixed ; the pupa enveloped in a 

 cocoon. 



Hydroptilidse.— Insects very minute, and simulating 

 Micro-Lepidoptera ; very strongly pubescent and 

 hairy, the wings with numerous erect hairs. 

 Palpi very hairy, simple in structure. Antennae 

 short and stout. Case of the larva free, mem- 

 braneous and seed-like. 

 The student should be able to identify the family 



from the foregoing tables. 



