GEOLOGICAL SUEVEY OF THE TEEEITOEIES. 441 



Tliamnotrizon scahricollis, nov. sp. 



Prouotum roughly punctured, dark purplish. Femora striped with 

 yellow. 



Female. — Head smooth; first joint of the autennfe broad, flattened; 

 frontal tubercle broad, fiat, and truncated below by the transverse sulcus 

 between the autenugB. Pronotum of moderate length, sub-tricarinate, 

 expanding posteriorly; deeply and coarsely punctured, so as to render 

 it somev7liat scabrous; a distinct, oblique impression each side of the 

 median carina; a smooth space on each side near the middle; lateral 

 carinas obtuse, truncate in front, obtusely rounded behind; sides extend 

 lowest at the anterior coxse, angles rounded, posterior oblique; margin 

 slightly curved inward. Abdomen large, nearly twice as long as the 

 thorax, carinated; apex of the last segment suddenly narrowed, forming 

 a slight entering angle each side; terminal, triangular portion somewhat 

 tumid and excavated at the middle of the upper surface. Cerci very 

 small, pointed. Subanal plate very large and broad, with a square 

 notch at the middle of the apex; ovij)ositor slightly curved, acuminate. 

 Elytra extend the width of one segment beyond the pronotum. Femora 

 all unarmed. Anterior tibise, with one row, 3-4 spines above, situate 

 somewhat on the external face; middle tibiae with two rows above, 

 inner row 5-6 spines, outer 4; posterior tibise with two rows beneath. 

 Posterior femora slightly arcuate near the base, about as long as the 

 abdomen; appendages to the first dorsal joint about as long as the 

 apical spines, sub-reniform. 



Color, (after immersion in alcohol, but very near as when living.) — 

 Face yellow below the eyes; two brown dots on the clypeus; buccal 

 suture fuscous ; base of the antenna} j^ellowish, a purple dot on the front 

 of the first joint; occiput purple. Pronotum brownish-purple, palest 

 near the apex; broadly margined on the sides with yellow. Abdomen 

 dark-purple, with paler points and spots; ovipositor testaceous, fuscous 

 at the apex and along the upper edge. Posterior and middle femora 

 light-purple, w^ith rows of black dots along the disk. Tibiae purplish, 

 spines piceous at the tips. Elytra, which are very small, have a purple 

 disk and yellow margin. 



2Iale. — Cerci short, very robust, with an obtuse inner tooth at the 

 apex; subanal plate large, elongate, deeply notched at the apex, the 

 notch forming an acute angle; the cylindrical appendage at the tip of 

 each lobe, short. Elytra, extending across two segments, colored, as in 

 the female. 



Dimensions. — $ ,$ , length, 1,25 inches; x)osterior femora, .75 inch; pos- 

 terior tibice, .74 inch; ovipositor, .77 inch. 



Found in Southern Montana on the dividing range of the Eocky 

 Mountains at an elevation of G,GOO to 8,000 feet above the level of the sea. 



Pterolepis (?) Saldemannii, Thos. 

 S5'n., Ancibrus Haldemannii, Girard. 



I have met with this species only in Colorado and Eastern Wyoming. 

 I am rather inclined to think it does not belong to the Pacific slope. 



F. (?) Btevensonii, Thos. , 



Syu., Anoibrus Stevensonii, Thos. 



F. (?) niinutus, Thos. 



Sj"!!., Anabrus minutus, Thos. (PL II, Fig. 17.) 



For the reasons heretofore given, these species will also have to be 



