238 ACADEMY OF NATURAL SCIENCES 



each side, above margined with greenish yellow : wings pale 

 green : feet pale, anterior and intermediate thighs somewhat ar- 

 cuated, with a green line ; posterior thighs with a green line on 

 the exterior side and another above, which is faintly marked by 

 two pale spots near the middle, a dusky annulation near the tip ; 

 posterior tibia green, pale towards the tip, and on the anterior 

 side: abdomen pale with minute dusky spots; segments margined 

 with dusky. 



Length to the tip of the hemelytra one inch and three-tenths. 



This species, with several others, occurred in great numbers 

 near the mountains, and on one occasion we observed this species 

 in company with several others, ascending to a great height in 

 the air as if to commence a migration to a remote region. 



[Belongs to Caloptenus, and is identical with C. femoratus 

 Burm. Handb. 2, part 2, 638. Acrydium fiavovittatum Harris, 

 Ins. Injurious to Veg. 140, is a small variety, very common in 

 the Atlantic States, and occasionally mixed with the larger spe- 

 cimens which occur in the western part of the country. It is 

 very common on the salt marshes near Baltimore, and I have 

 once or twice seen it in company with C. femurruhrum (Degeer), 

 in considerable swarms in the air. 



[Dr. Harris makes a very singular mistake in comparing this 

 species with Acridhim olivaceum Serv. — Uhler.] 



ACHETA Fabr. Leach. 



A. EXIGUA. — Head and thorax testaceous; feet whitish ; ab- 

 domen black. 



Inhabits Missouri. 



Head testaceous, hairy, with obsolete dusky lines above, con- 

 tracted before the eyes into a [310] short, obtuse, conical process : 

 front vertical, trilincate, lines fuscous, convivant at the mouth : 

 antennae long, fuscous, pale at base : palpi white : thorax testaceous, 

 hairy : hemelytra yellowish-white, right one entirely concealing 

 the other : ncrvures (male) with but few anastomoses, at tip en- 

 closing a large, oval, rugose, but membraneous space : feet whitish ; 

 posterior thighs with a brown line on the exterior side; posterior 

 tibia with three pairs of alternate spines, and larger ones at tip ; 

 abdomen black. 



Length about a quarter of an inch, A male. 



[Vol. IV. 



