HOW TO KNOW THE IMMATURE INSECTS 



7b. Mesonotiim submembronous^ or with a pair of 

 bar-shaped sclerites. Fig. 409 8 



Fig. 409. Dorsal 

 aspect of meso- 

 thorax. 



M?; ,V^; Leptocello olbido 

 (Woker). (Redrawn from 

 Ross) 



8a. Mesonotum with a pair of bar-shaped sclerites. 



Fig. 410 Family LEPTOCERIDAE 



This is a large family of wide distribu- 

 tion. The cases are cylindrical or taper- 

 ing and may be either straight or curved. 

 They frequent both running streams and 

 quiet water and are good swimmers. 



8b. Mesonotum without a pair oi bar-shaped sclerites. 



Fig. 411 FamUy PHRYGANEIDAE 



Most of the larval cases are long and 

 built in a spiral. They live in still or slowr 

 ly running water. In general they favor 

 marshes and lakes for their abodes, but 

 some species are taken in rivers and 

 sureams. 



Fig. 411. A, Agrypnia ves- 

 tita (Walker) : a, larval 

 case; b, young larval case; 

 B, Ptilostomis ocellifero 



(Walker), anterior end of 

 larva. 



ORDER LEPIPOPTERA 

 Key to the LARVAE of the more important tomilies 



la. Thoracic legs present and segmented 2 



lb. Thoracic legs absent or reduced to fleshy swellings 7 



2a. Body with large, ovate scales, arranged in a double row on each 

 side. Fig. 412 Family MICROPTERYGIDAE 



The larvae of Micropteryx 

 //TV^ b live on wet moss and are char- 



acterized by the presence of 8 

 pairs of segmented abdominal 

 prolegs. The larvae of Saba- 

 Fig. 412. a, Micropteryx sp.; b, a scale, tijica OCCUr among liverworts. 



149 



