HOW TO KNOW THE IMMATURE INSECTS 



12b. Prothoracic presternum transverse, narrow and band-shaped; 

 gula absent; gular suture median and simple. 

 Fig. 180 Family AMPHIZOIDAE 



The family consists of the single genus, 

 Amphizoa, with only 3 aquatic species. 

 They inhabit rocks and logs in fresh water 

 streams along the Pacific coast of N. 

 America and 1 species in Tibet. 



Fig. 180. a, Amphizoa 

 sp.; b. Ventral aspect of 

 head and prothorax. 



13a. 8th abdominal segment glandular, discoidal and terminal. 



Fig. 181 Family PAUSSIDAE 



3/ 



10^ More than 300 species are known. 



4j/%^%^ They are adapted to a myrmecophilous 



^ %S^'if ^®* ^® metamorphoses of this family 



have received very little attention. Its 



'f ^ — -— *^,_/ known members are all exotic. 



Fig. 181. Paussus kannegieteri 

 Wasm. 



13b. 8th abdominal segment not glandular and not discoidal 14 



14a. Cerci segmented, individually movable 15 



14b. Cerci solid or absent 28 



15a. (a) Galea usually inserted on the palpifer; if absent, then the 

 abdomen with only 8 distinct segments; or (b) galea less often 

 inserted on stipes (to the outside of lacinia), but 

 then the mandible serrate, the cerci 2-segment- 

 ed, and the 10th abdominal segment almost al- 

 ways with a pair of recurved ventral hooks. 

 Fig. 182 114 



Fig. 182. Maxilla. 



78 



