FAMILY LOCUSTID^. 147 



ACRYDIUM FLAVOVITTATUM. 



This common species is larger than the former, and is marked with a yellowish stripe 

 on each side from the forehead to the tips of the wing-covers. Length 1| - 2 inches. 

 Very common in haying time, and often found in barns among the newly gathered hay. 



Genus TETRIX. 



This genus differs from Locusta and Acrydium, by the long and sharp triangular outline 

 when seen from above, or rather the double triangular form of the body of the insect, the 

 base or widest part being between the middle legs, from which it tapers each way ; the 

 head being smaller than in the former genera. The insect is small, with small wing-covers ; 

 but the wings are large in proportion to the size of the body, and scollopped on the edge. 

 The females have four boring appendages, which are notched on their edges. 



Dr. Harris divides the genus into two groups : first group, antennae 13- or 14 jointed; 

 second group, 22-jointed, with additional characters not necessary to be noted here. 



For a very full account of these three genera, see Harris's Treatise on Insects, 2d ed. 



