68 ELEMENTARY LESSONS ON INSECTS 



6. Paired gills on the back of the abdomen on some or 

 all of the first seven segments. 



7. The long tails. 



In a nymph of the climbing type note: 



1. The more or less grasshopper-like form of the head- 



2. The large laterally directed eyes. 



3. Smoothly tapering body. 



4. The densely fringed tails. 



In a nymph of the burrowing type note: 



1. The more tapering front. 



2. The huge tusks projecting forward on the mandibles. 



3. The smaller eyes. 



4. The flattened front tibia, shovel-like, adapted for 

 digging. 



5. The oblique-tipped hind tibiae, adapted for pushing. 



6. The feathery gills, close laid on the back. 



7. The paler color. 



In a nymph of the close clinging, flat type note: 



1. The thin flaring margin of the head. 



2. The dorsal position of the eyes and antennae. 



3. The ventrally placed mouth. 



4. The pro thorax, broad and evenly contoured. 



5. The flattened legs with fringed hind margins. 



6. The down bent claws. 



7. The wide spreading, thinly fringed tails. 



