CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS IO9 



Genera of the Tryxalince: 



A. Foveolae of vertex present, and visible from above. Lateral carinas of 

 pronotum incurved. — Stenobothrus curlipennis. 

 AA. Foveolse absent; lateral carinas nearly parallel. — Chrysochraon conspersum. 

 Genera and Species of QLdipodina: 

 A. Wings with the disk yellow. 



B. Apical half of wing dusky. 



C. Dorsal aspect of head with a slight median carina which is quite 

 prominent in the central foveola. — Enco ptolophus sordidus. 

 CC. Dorsal aspect of head without median carina; central foveola 

 less distinct. — Chortophaga viridifasciata. 

 BB. With a dark band across the wings. — Spharagcmon (equate. 

 A A. Wings with the disk black. — Dissosleira Carolina. 

 AAA. Wings transparent with dark veins; tegmina smoky brown with darker 

 spots and yellowish blotches on sides. — Camnula pellucida. 



Fig. 63. 



-Tip of male abdomen of Melanoplus, dorsal view. A, M . femur-rubrum; 

 B, M. spretus; C, M. atlanis; D, M. differenlialis. 



In the West the Rocky Mountain Locust {Melanoplus spretus) 

 did, and occasionally does, produce much injury to grain and other 

 crops. Another species more widely distributed is M. atlanis which 

 sometimes becomes migratory. The Red-legged Locust or Grasshop- 

 per {M . femur-rubrum) , the Two-striped Locust {M. bivittatus) and the 

 Pellucid Locust {Camnula pellucida) in the East and the Differential 

 Locust {M. diferentialis) in the South are the species that do most 

 injury. 



Red-legged Locust or Grasshopper {Melanoplus femur-rubrum, 

 DeG.).^ — ^This locust is usually the most abundant form in the East, 

 and is most numerous in low grounds and cultivated fields where vege- 

 tation is more or less rank (Fig. 64). 



Adult. — Of medium size, about an inch long; reddish brown in color; 

 tegmina sometimes without spots but usually spotted, surpassing 

 the hind femora, which are reddish brown; hind tibiae red with black 



