ORTHOPTERA. 113 



other order, the Cicada. In order to avoid confusion, I have referred 

 to the members of the Locustidae and the Acridiidae as Long-horned 

 Grasshoppers and Short-horned Grasshoppers respectively. It is 

 better, however, to call the former Grasshoppers, and the latter Lo- 

 custs. This last term should never be applied to the well-known 

 insect which appears once in seventeen years; this is rightly called 

 the Periodical Cicada. 



Representatives of each of the more common genera of the North- 

 eastern United States are mentioned below. These genera can be 

 separated by the following table :* 



A. Wingless, or with rudimentary wings and wing-covers. 

 B. Pronotum not extended over the meso- and metanotum.. 



i. CEUTHOPHILUS. 



BB. Pronotum extended over meso- and metanotum. 9. THYREONOTUS. 

 A A. Winged. 



B. Tegmina expanded in the middle. 



C. Tegmina much broadened in the middle, concave. 5. CYRTOPHYLLUS. 

 CC. Tegmina somewhat broadened in the middle, not concave. 



D. Ovipositor very small. 7. MlCROCENTRUM. 



DD. Ovipositor of medium size. 6. AMBLYCORPHYA. 



BB. Tegmina not expanded in the middle. 

 C. Vertex of the head with a conical projection forwards. 



4. CONOCEPHALUS. 



CC. Vertex of the head without a conical projection. 



D. Ovipositor straight, or very nearly so; insect small. 2. XlPHlDUM. 



DD. Ovipositor curved ; insect large. 



E. Ovipositor curved sharply upwards. 8. Sen i 



EE. Ovipositor sword-shaped. 3. ORCHI i I\HM 



In order to facilitate the study of the Locustarians, our common 

 genera can be arranged in four groups; namely, the Cricket-like 

 Grasshoppers, the Meadow Grasshoppers, the Katydids, and the 

 Shield-backed Grasshopp 



I. The Cricket -I ike Grasshoppers. 



\. Ccnthophilns. To the genus Ceuthophilus belong certain 

 choppers, which bear some resemblance in form to 

 crickets (Fig. 104). They have a short, thick body and ibly 



stout hind femora, like a cricket, but arc- entirely destitute f 

 mina and win^s. All t! ;i our collection 



pale brown or dirty white color and more or less mottled with rithei 



* After S. H. Scudder, Boston Journal Natural History, Vol. VI ; 



