McNeill — revision of the truxalin^e of north America. 225 



Stenobot/inis co/oradi/s,lir\\\\Qr,\d,2>T,. 3rd. Rept. U.S. Ent. Com. ,55. 



StenobothrKs coloradiis, Bruner, 1885. Bui. Wash. Col. Lab. Nat. 

 Hist., I, No. 4, 131. 



Stenobothriis coloradus, Bruner, 1885. Rept. Com. Agr., 307. 



Hab. Montana, Wyoming, and Colorado, east of the Rocky 

 Mountains, Kansas and Nebraska. 



This, like Opeia obscurus, Thos. , is a sj^ecies of the great plains. It 

 is reported by Bruner as very common in the Yellowstone Valley. 

 The National Museum contains Thomas' ty])es and s])ecimens from 

 Nebraska, Wyoming, Colorado, and Montana. 



2. Amphitornus ornatus, n. sp. 



Stenobothriis coloradiis, Koebele, 1890. Bui. 22, Div. Ent., 94. 



This species is closely allied to the preceding, but the following dif- 

 ferences appear: The head and pronotum in this species are longer, 

 and the face is distinctly more oblique in both sexes. The antennae 

 of the female are more depressed and distinctly acuminate. The me- 

 dian carina is cut decidedly behind the middle. The colors are 

 brighter and more strongly contrasted. The posterior tibiae are 

 bright blue. 



Described from several specimens from Los Angeles, California, 

 which now belong to the United States National Museum. 



XIL AKENTETUS, n. gen. Fig. 12. 



This genus is closely related to Amphitornus. It differs in the 

 somewhat longer and considerably deeper sculpturing of the head, but 

 especially in the structure of the pronotum which is nearly plain above 

 with the lateral carina faint except upon the anterior part of the pro- 

 zone and the metazone and considerably divergent from the middle 

 sulcus to the posterior margin. These are cut by all three transverse 

 sulci. The median carina is faint and cut near the middle by the 

 principal sulcus only. There are no traces of supplementary carinae. 

 The color is nearly uniform brown. 



This genus contains a single species found in Colorado. 



Akentetus unicolor, n. sp. Fig. 12a, 12b. 



Length (male) 18.5 mm. 



Tegmina 16 mm. 



Post. Fem 12.5 mm. 



