114 ECONOMIC ENTOMOLOGY 



LocusTiD^ (Long-horned Grasshoppers or Locusts) 

 More Common Genera and Species 



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



B. Pronotum not extended over meso- and metanotum. — Ceuthophilus. 

 BB. Pronotum extended over meso- and metanotum. — Thyreonolus. 

 AA. Winged. 



B. Tegmina expanded in the middle. 



C. Tegmina much broadened in the middle, concave. — Cyrtopkyllus. 

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

 D. Ovipositor very small. — Microcentrum. 

 DD. Ovipositor of medium size. — Aniblycorypha. 

 BB. Tegmina not expanded in the middle. 



C. Vertex of the head with a conical projection forward. — 

 Cotiocephalus. 

 CC. Vertex of the head without a conical projection. 



D. Ovipositor straight or very nearly so; insect small. — 

 Xiphidium. 

 DD. Ovipositor curved; insect large. 



E. Ovipositor curved sharply upward. — Scudderia. 

 EE. Ovipositor sword-shaped. — Orchelimum. 

 Species of Ceulhophilus: 



A. Fore femora about as long as pronotum. — C. maculalus. 

 AA. Fore femora longer than pronotum. — C. brevipes. 

 Species of Thyreonolus: 



A. Pronotum well rounded behind. — T. dorsalis. 

 AA. Pronotum nearly square. — T. pachymerus. 



The members of this family are seldom of sufl&cient importance 

 economically to require special treatment. The katydids, shield- 

 backed grasshoppers, cricket-like grasshoppers, and meadow grass- 

 hoppers belong here and are interesting objects of study. Recently 

 it was found that two species of katydids {Scudderia furcata Brunner 

 and Microcentrum rhombifolium Sauss.) are injurious to oranges in 

 California, often causing serious loss. (Bull. 256, Bur. Ent. U. S. 

 Dept. Agr., 1915.) 



Gryllid^ (Crickets) 

 Genera and Species 



A. Fore tibiae broad, fitted for digging (Fossorial Crickets). 



B. Insect small; antennae ten- to twelve-jointed. — Tridactylns. 

 BB. Insect large; antennae many-jointed. — Gryllotalpa. 



