78 AMERICAN ENTOMOLOGY. 



they continue active and voracious, and their gait is always either 

 a leap or a walk. In the larva state, they are destitute of any 

 appearance of wings or hemelytra, but on changing to the pupa, 

 they gain the rudiments of those members, to be completely de- 

 veloped at the next change. 



Gryllus formosus. — Specific character. Thorax with a 

 much elevated, compressed, and denticulated carina. 



Desc. Body pale green : antennae yellowish : thorax armed 

 with numerous small denticles, above compressed, very much 

 elevated into a regularly arcuated carina, forming a portion of a 

 circle, the centre of which is anterior to the origin of the heme- 

 lytra ; carina with two yellow radii, and yellow posterior and 

 anterior edges ; posterior half of the edge, prominently denticu- 

 lated : hemelytra with about six large brown spots, with areolae, 

 placed 2, 2, 2 : posterior thighs annulate, with yellow. 



Obs. When returning with a detachment of Major Long's 

 party, at a distance of about an hundred and fifty miles from the 

 mountains, on the banks of the Arkansaw river, I had the plea- 

 sure to find a considerable number of this uncommonly beautiful 

 species. It occurred only in a very limited district, and was not 

 afterwards seen. 



The middle figure, with a wing above on the left. 



Gryllus hirtipes. — Specific character. Head conic, pos- 

 terior segment of the thorax elevated into a carina. 



Desc. Body pale green : head above conic, elevated, with dark 

 green lines : antennae red : thorax varied with dark green ; pos- 

 terior segment compressed above, and elevated into a prominent, 

 arcuated, mutic carina : hemelytra with large, confluent, dark 

 green spots : feet hairy ; posterior tibiae densely hairy. 



Obs. A curious species, of which the conic head gives it the 

 air of a TruxaMs, but the antennae are not ensiform, neither are 

 the posterior thighs elongated, as in that genus. The anterior 

 segment of the thorax is altogether destitute of any appearance 

 of carina. 



It occurred with the preceding. 



The upper figure, with a wing below on the right. 



Gryllus trifasciatus. — Specific character. Hemelytra tri- 

 fasciate with fuscous ; wings pale yellow at base, with a fuscous 

 band. 



