268 GEOLOGICAL SUEVEY OF THE TERRITORIES. 



THAMNOTRIZON, (FISCHER.) 



T.purpurascens, Thos. Syn., Anabrus purpurascens, Uhler. (Proc. Acad. 

 Nat. Sci., Phila., p. — .) — Ihaveremoved this species from Anabrus because 

 the prosternuui is not spined, which must be a prominent character of 

 that genus to retain the other species. The original description by Mr. 

 Uhler is so full and clear that any addition is wholly unnecessary. 



Found in South Park in considerable numbers, also in Wyoming, east 

 of the Black Hills, on elevated plateaus. 



T. trilineatus, Thos. Syn., T. trilineatus, Thos. (Proc. Acad. Nat. Sci., 

 Phila., 1870, p. 76.) — Female : Small, somewhat like Anabrus minutus, 

 (Thos.,) but showing some important variations which place it in a differ- 

 ent genus. Head moderate size, immersed in the pronotum nearly to 

 the eyes; occiput very short, convex; vertex rounded between the 

 antennae, slightly advanced in front, this advanced portion triangular 

 and deflexed ; face short, broad, smooth and somewhat convex ; iabrum 

 large, round. Palpi rather longer than usual, slender, cylindrical, ter- 

 minal joint of the maxillary palpi longest. Pronotum small, rounded, 

 not carinated; advanced in front over the back of the head, margin 

 round, or sub- truncate ; posterior extremity advanced over the base of 

 the abdomen, round ; sides narrowed below, reaching down about as far 

 as the lower border of the eyes ; posterior margin of the sides sloped quite 

 obliquely, slightly sinuate. Antennas reach the tip of the ovipositor. 

 Ovipositor about the length of the body, slightly bent ; cerci short, stout, 

 covered with minute, depressed hairs ; the plate between them triangu- 

 lar. Prosternuui not spined. Anterior tibiae with two spines in front; 

 medial with two rows on the outside, 4 (counting the one at the base) 

 and 2. Posterior legs wanting in the only specimen obtained. 



Color (siccus :) testaceous green, striped and varied with pale yellow. 

 Face testaceous, palest below, with a brown spot at each lower corner. 

 Three pale, tolerably broad, yellow stripes reach from the head to the 

 end of the abdomen ; one along the middle of the back, and one along 

 each side. Two oblique black marks on the back of the pronotum about 

 the middle ; lower margins of the sides yellow ; beneath pale. Ovipos- 

 itor fuscus. Antennae dusky. Legs purplish ; tarsi piceous. 



Dimensions: length, .75 inch; to the end of the pronotum from the 

 vertex, .34 inch; ovipositor, .73 inch. 



Habitat: Southeast Colorado. Some specimens not yet examined, 

 which may belong to this species, found near South Pass. 



EPHIPPITYTHA, (SERV.) 



This group, which is given by Serville as a sub-genus of Phaneroptera, 

 is distinguished from the rest of the Phaneropteres by characters of suf- 

 ficient importance to justify me in raising it to a genus. 1 have not 

 examined a sufficient number of specimens to enable me to write out the 

 generic characters in full, but will mention the following: 



Pronotum selliform, somewhat scooped on the latter half, which is 

 slightly elevated, and rounded; femora more or less spined; vertex 

 tuberculate. Elytra and wings passing the abdomen, latter longest. 



E. gracilipes, Thos. Syn., E. gracilipes, Thos. (Proc. Acad. Nat. Sci., 

 Phila., 1870, p. 76.) — Male: Small, slender; legs very long and delicate; 

 occiput short, convex, terminating in a triangular tubercle at the vertex, 

 not raised above the first joint of the antennae, nor passing between them ; 

 face vertical, straight, fiat, terminating upward just above the central 

 ocellus in a sharp angle; ocellus situated exactly between the lower 



