HOW TO KNOW THE IMMATURE INSECTS 



5a. Labial palpi latent; mentum and ligula fused into an unpaired an- 

 teriorly bilobed piece. Fig. 171 Family RHYSODIDAE 



/^-^Ifi'.V Rather more than 100 

 { ..h,aoiA species have been de- 

 j/v/v/.*' scribed. Nothing ap- 

 pears to be known about 

 their metamorphoses. 

 r The larvae are probably 

 predacious. Look for 



them under decaying 

 Fig. 171. a, Clinidium sculptile Newn:; b, Ventrol u^-u 



aspect of labium. DOrK. 



5b. Labial palpi distinct and segmented. 



Fig. 172 6 



6a. 9th abdominal segment present; 8th abdominal . .^iuenijmm 



segment never terminal. (See Fig. 174) 7 



Fig. 172. Ventral 

 aspect of labium. 



6b. 9th abdominal segment rudimentary; 8th abdominal segment long, 

 conical, appearing as the terminal segment oi the body. 

 (See Fig. 177) 10 



7a. 10th abdominal segment developed as a pygopod for locomotory 

 purpose 8 



7b. 10th abdominal segment not developed as a pygopod. 



Fig. 173 Family HALIPLIDAE 



They comprise about 100 widely distributed species. 

 Their larvae possess segmentally arranged groups of 

 freshy process and are aquatic insects. Larvae and 

 adults live together among aquatic plants and may 

 be collected readily by raking these plants out on to 

 the shore. 



Fig. 173. Peito- 

 dytes sp. 



75 



