40 



ELEMENTARY LESSONS ON INSECTS 



2. Black field crickets that live on the ground. 



3. Mole crickets that live in the ground in burrows. 



The tree crickets are most like the long-horns just dis- 

 cussed, but are smaller and more 

 delicately built insects, having 

 in the females an ovipositor that 

 is spear-like rather then sword- 

 like (not laterally flattened), and 

 3-jointed tarsi. The wings lie 

 flat on the back. The males are 

 prone to incessant chirping dur- 

 ing late summer and autumn. 



The Orthoptera allies, cock- 

 roaches, mantids and walking- 

 sticks are all few in kinds. One, 

 the cockroach, is only too well 

 known. The others are so unique 

 in form that they are all in- 

 stantly recognizable by a re- 

 ference to figure 15. A brief 

 outline for the study of re- 

 presentatives of these groups is 

 provided in the following lesson : 



Fig 15. — Two Orthopteran al- 

 lies A, a praying mantis; B, a 

 walking-stick. 



