76 NEW NORTH AMERICAN ACRIDHLE — BRUNER. 



width, somewhat narrower, with the sulcus of the fastigium also a trifle 

 deeper than in C. undulatus, the bounding walls sharper and better de- 

 fined than there and continuous witb the lateral carina? of the frontal 

 costa. The latter and also the lateral facial carina? much more prom- 

 inent than in undulatus. It also differs from that species in its smoother 

 body, more graceful and slenderer form, its longer and broader wings, 

 and shorter antenna?, which are very slender and threadlike. The chief 

 and distinguishing characteristic of this species, however, is in the vena- 

 tion of the hind wings. Instead of there being but a single vein along 

 the middle of the axillary field there are two of nearly equal prom- 

 inence; the secondary or anxiliary vein beiug a branch of the first 

 radial which in the female unites with the primary vein several milli- 

 meters before reaching the outer margin, but in the male continues 

 parallel withor a little divergent from it to the edge. The radial veins 

 here are no heavier in the male than in the female, and the cross- veins 

 of the humeral area are irregular, while in undulatus they are very 

 regularly scalariform. There are also other slight differences in the 

 venation of the wings between the two species, as there is also in the 

 margin. Inl apidicolus the margin is even more undulate or lobed than 

 in undulatus. 



General color dark-brownish cinereous, very profusely mottled with 

 rather small quadrate fuliginous spots, giving the insect a dingy black 

 color in imitation of the rocks among which they were taken. Wings 

 bright bottle-green or greenish yellow with a very faint indication of 

 the usual fuliginous band on the humeral field in some specimens, want- 

 ing in others: apical portion with the veins and cross- veins black. 

 Posterior tibia? glaucous, furnished with a moderately broad, light, testa- 

 ceous, basal annulus; tibial spines black; tarsi testaceous. Au tenure 

 dimly annulate. 



Length of body, $, 30 mm , 9 , 31 mm ; of antenna?, $ , 9.5 mm , 9,9'" m ; 

 of pronotum, $ , 6.3 n,m , 9 , 6.5" ,m ; of tegmina, $ , 32"' m , 9 ,30.5 ,n,n ; width 

 of wing, 3,21 mm , 9, 18.5 mm ; length of posterior femora, $ and 9, 

 14.5 mm ; of tibia?, $ and 9 , 12 mm . 



Hab. — Salmon City, Idaho (Bruner). 



This locust was observed at but a single locality in the Salmon River 

 range of mountains, west of Salmon City. It occurred among the tine 

 rocks forming the talus at the foot of a high precipice facing the south. 

 Although local, it is quite common, and was found in company with 

 several other locusts, such as Arphia tenebrosa, Circotettix vcrrueulatus, 

 etc. In habits it is very similar to those of its allies, and during the 

 hottest, brightest hours of noonday is to be seen and heard in the air, 

 producing its clattering music, which is anything but soothing. 



Circotettix shastanus sp. nov. 



A moderately slender species about the size of or a little larger than 

 C. verruculatus Kirby, but more closely related to C. undulatus Thos. 

 Wings with the disk yellow, brightest near the posterior outer edge. 



