io8 



ECONOMIC ENTOMOLOGY 



Genera of the TeUigina: 



A. Antennae 12-jomted and pronotum rounded. — Batrachidea. 

 A A. Antennae 13-14-jointed; pronotum horizontal. — Tettix. 

 AAA. Antennae 22-jointed; pronotum horizontal. — Tettigidea. 

 (For species see Blatchley's Orthoptera of Indiana.) 

 Genera of the A cridince: 



A. Wings as long or longer than the abdomen. 



B. Pronotum sloping from median carina; extremity of abdomen in males 

 not swollen. — Acrid ium or Schislocerca. 

 BB. Pronotum flattened; extremity of abdomen in males swollen. — 

 Melanoplus. 



Fig. 62. — -Abdomen of male Melanoplus hiviilalus. A, lateral view; B, dorsal view; 

 C, ventral view. {After Lugger.) 



Species of Acridium: 



A. Size large; antennae rather short. — A. americana. 

 AA. Size medium; antennae longer. 



B. Color yellowish-brown or olive-green. — A. alutacea. 

 BB. Color rusty-brown; no yellowish stripe on dorsum. — A. rubiginosa. 

 Species of Melanoplus: 



A. Apex of last ventral segment of male distinctly notched (Fig. 63) . 

 B. Length of body to tip of wing-covers 29-35 mm. — M. spretus. 

 BB. Length of body to tip of wing-covers 23-26 mm. — M. atlanis. 

 A A. Apex of last ventral segment of male entire, or at least obscurely notched. 

 B. Anal cerci enlarged at apex. — M. bivitlatus. 

 BB. Anal cerci tapering. 



C. Species of medium size; anal cerci much narrowed, but without a 

 notch. — M. femur-ruhrum. 

 CC. Species of large size; anal cerci suddenly narrowed, making a 

 prominent right-angled notch on lower side. — M. difereniialis. 



