36 



ARTHROPODA 



Mountain locust is always present in greater or less num- 

 bers in Montana and parts of Dakota, Wyoming, Colorado, 

 Utah, Idaho, and Oregon. On certain occasions swarms 

 of many millions migrate to the adjacent states, being 

 driven by the wind as they hold 

 the wings expanded, but they 

 have never been found east of the 

 Mississippi River. The Carolina 

 locust (Dissosteira Carolina), the 

 large gray species frequenting the 

 roadside everywhere in late sum- 

 mer, and recognized by its yellow- 

 bordered hind wings, seldom be- 

 comes so numerous as to cause 

 much damage. 



The Black Cricket 



The short-winged black cricket 

 (Gryllus abbreviatus) is a common 

 autumn insect in every pasture 

 and may frequently be found un- 

 der boards and stones as late as 

 December. The female is distin- 

 guished from the male by the long 

 ovipositor projecting from the end 

 Natural of the abdomen, through which eggs 

 pass into holes made in the ground. 

 Here they remain from fall until spring, when the little 

 crickets emerge in the nymph stage without wings. The 

 crickets are celebrated for their high-pitched chirping, 

 produced by the male only, by elevating over the back 



ius abbreviates). 



