GEOLOGICAL SURVEY OF THE TERRITORIES. 269 



borders of the folds around the base of the antennae. Pronotum sub- 

 cylindrical in front, widened and elevated posteriorly; a slight trans- 

 verse iudenture each side, a little behind the middle; not carinated, but 

 a medium line is visible along the dorsum ; surface smooth. Elytra very 

 narrow, nearly straight, passing the abdomen one-third their length. 

 Abdomen sub-cylindrical; the sub-anal plate notched and bi-spinose; 

 cerci stout, hairy, curved and mucronate ; upper plate semicircular. 

 Prosternum not spined ; meso- and meta-sternum obliquely elevated at 

 the posterior angles, obtuse. 



Color (siccus :) pale yellow. A roseate stripe on the frontal tubercle; 

 second joint of the antennae orange-yellow ; a bright yellow curved line 

 runs from the upper canthus of each eye to the pronotum, where they 

 meet with broader lines on the pronotum, which, converging posteriorly, 

 fade near the middle of the dorsum. Anterior portion of the pronotum 

 dotted with red. Stridulating organs very small, roseate. Elytra and 

 wings pellucid. Abdomen minutely clotted with reddish-brown. Tips 

 of the cerci black. 



Dimensions: length, .75 inch; to tip of the wings, 1.25 inch; wings 

 pass the elytra (about) .25 inch; femora, .1 inch; tibia, .95 inch. 



Habitat : Southern Colorado. Unique specimen. 



ORCHELIMUM, (SERV.) 



0. vulgare, Harr. — The specimens I have marked as belonging to this 

 species may prove to be new, as they vary considerably from the type. 



CETJTHOPHILUS, (SCUDD.) 



G. divergens, Scudd. — My specimens vary from the description of this 

 species in having the hind femora of the females spined, the spines very 

 short. There are also one or two slender spines on the front part of the 

 anterior tibiae not mentioned in Mr. Scndder's description, yet I think 

 they belong to this species. 



ACEIDID^E. 



(Truxalides.) 



OPOMOLA, (SERV.) 



0. neo-mexicana, Thos. Syn., 0. neo-mexicana, Thos. (Proc. Acad. 

 Nat. Sci., Phila., 1870, p. 77.) — Female: Long, slender, truxaloid. Head 

 conical; occiput convex, ascending to the somewhat elevated vertex; 

 vertex convex, ascending, sub-margined, rotund, rather elongate before 

 the eyes ; face very oblique ; frontal ridge distinct, sides parallel, slightly 

 sulcate; lateral carinae distinct, obtuse, divergent, reaching the lower 

 corners of the face. Antennae strongly ensiform, triquetrous, reaching 

 to the tip of the pronotum ; inserted in deep foveolae under the front of 

 the cone. Pronotum about as long as the head; sides parallel; all its 

 parts very regular; tricarinate, carinae not elevated but distinct, all 

 about equal; obtusely rounded anteriorly and posteriorly. Elytra a 

 little shorter than the abdomen ; wings a little shorter than the elytra. 

 Posterior femora reach the extremity of the abdomen; very slender. 

 Prosternal point short and obtuse, scarcely more than a pointed 

 tubercle. 



Color (immediately after being taken out of alcohol, in which it had 

 been immersed for some months:) Face yellow, clotted with red; lateral 



