274 GEOLOGICAL SUEVEY OF THE TERRITORIES. 



Habitat: Found with the preceding, but a much rarer species. At first 

 glance, when seen hopping among the grass, the collector is apt to take 

 it for the pupa of Calop. bivittatus. 



OEDIPODA, (LATE.) 



Oe. corallipesy Hald. (Stans. Eep. Salt Lake, p. 371, PL X, fig. 3.) — 

 Dimensions : Female — length, 1.80 inch ; femora, .90 inch ; tibia, .75 

 inch ; to tip of elytra, 2 inches. Male about two-thirds the size of the 

 female. 



Habitat : Colorado, Wyoming, and Utah. 



The bright vermillion tint of the posterior legs fades in alcohol. I am 

 inclined to believe that Oe. pardalina (Sauss.) is synonymous with this 

 species, but do not feel satisfied to decide positively on this point. 



Oe. trifasciata, Thos. Syn., Oe. pruinosa, Thos. (Proc. Acad. Nat. 

 Sci., Phila., 1870, p. 80.) — Gryllus trifasciatus, Say. (Amer. Ent. Ill, 

 PL XXXIV, fig. 3. (Ed. Le Conte, 1, 78, PL XXXIV, fig. 3.)— The figure 

 given in the edition by Dr. Le Conte is not a good one, nor, indeed, does it 

 correspond with the description, which is somewhat minute. I give the 

 following description, which I think will be sufficient to identify the 

 species : 



About the size and somewhat similar in coloring and appearance to 

 Oe. aequaZis, (Say,) but rather broader across the meso and meta thorax; 

 head, viewed from the side, oblong; occiput convex, ascending; vertex 

 broadly triangular, flat, not foveolate, declined, slightly margined and 

 slightly contracted between the eyes; margins continuous with the froutal 

 ridge ; frontal ridge prominent, rounded above and somewhat sulcate 

 below, expanding at the ocellus; lateral carinas distinct, sinuous, and 

 divergent below, (in the males these carinse are more distinct and ex- 

 tended than in the females). Pronotum short, sub-cylindrical in front, 

 expanded and more angulate posteriorly; cross incisions 1 and 3 distinct, 

 2 very indistinct in the males, apparent on the sides in the females, 1 

 arcuate above, 3 slightly sinuous and situated about the middle of the 

 pronotum; median carina merely a raised line; lateral carinse obliter- 

 ated in front, obtuse on the posterior lobe ; truncate in front, posterior 

 angle obtuse. Elytra and wings considerably longer than the abdomen. 

 Posterior femora broad, not reaching the extremity of the abdomen, 

 Antennae stout, central joints lengthened and distinct; reaching the 

 middle of the abdomen in the males, a little shorter in the females. 



Color (siccus) : Varies considerably; that which is described as green 

 by Say is often yellowish in the living insect, and pruinose after im- 

 mersion in alcohol ; and that part of the head and thorax described by 

 him as brown often being a pale lilac, or mouse color. The intermedi- 

 ate cross band on the elytra is the broadest and darkest of the three. 

 The posterior femora are often prainose at the base. (My remarks 

 apply to those dried after immersion in alcohol). 



Since writing the description published in the Proceedings of the 

 Academy of Natural Sciences, Philadelphia, 1870, p. 80, I have had an 

 opportunity of examining a number of specimens taken at widely dif- 

 ferent points in the West, and find the species is subject to considerable 

 variations, some specimens approaching so near Oe. aequalis that it is 

 almost impossible to distinguish them from that species, if we rely upon 

 color. , 



Dimensions: Male — length, 1.10 inch ; to tip of elytra, 1.42 inch ; pro- 

 notum, .26 inch; femora, .00 inch; tibise, .58 inch. Female — length, 

 1.48 inch; to tip of elytra, 1.70 inch; pronotum, .34 inch; femora, .76 

 inch; tibice, .70 inch. 



