MCNEILL REVISION OF THE TRUXALIN^ OF NORTH AMERICA. 263 



lighter and a very much broken blackish stripe behind the eye. The 

 surface is everywhere shining, but least so on the top of the head and 

 pronotum. 



Very closely related to Sfeiiobothriis curtipeniiis, but sufficiently dis- 

 tinct to be easily recognized. When compared with that species, colora- 

 densis has the vertex narrower between the eyes with the median carina 

 distinct instead of very faint. The antennae of the female are scarcely 

 as long as the head and pronotum instead of being distinctly longer. 

 The pronotum is much shorter proportionally and decidedly less ex- 

 panded posteriorly, the disk being scarcely wider at the posterior mar- 

 gin than at the anterior margin instead of being i^ times as wide. 

 The lateral carina are gently instead of strongly curved, and the pos- 

 terior margin of the disk is rounded instead of angulate. finally, the 

 posterior femora are more robust. 



Described from a single female received from Prof. C. P. Gillette, 

 Fort Collins, Colorado. The specimen was labeled " Colo. 1936." 



Hab. The eastern slopes of the Rocky Mountains, south to Utah 

 and Colorado, and west to the Sierra Nevada Mountains. 



3. SxENORdTHRUS BRUNNEUS, Thos. 



StenobotJinis bniniieiis, Thos., 187 1. Prelim. Rept. U. S. Geol. Surv. 

 Wyo., 266. 



Stenobothriis bniiinctis, Thos., 1872. Prelim. Rept. U. S. Geol. Surv. 

 Mont., 430. 



Stenobothriis bru/iiicus, Thos., 1873. Syn. Acrid. N. Am., 91. 



Stenobothriis briinneiis, Bruner, 1877. Can. Ent., IX, 144. 



Stenobothrus brunneus, Bruner, 1883. 3rd Rept. U. S. Ent. Com., 56. 



This is apparently a sonievvhat uncommon species since it has been 

 reported in but two or three collections. It is found from Nebraska 

 to the Sierra Nevada Mountains and south to Colorado. The National 

 Museum contains specimens labeled GoinpJiocerus brunneus from Fort 

 McLeod, Henry county, Idaho; Henry Lake, Idaho, and Fort Mc- 

 Kinney, Wyoming. 



4. Stenobothrus sordidus, n. sp. Fig. 25c. 



Length (male) 17 mm. (female) 24 mm. 



Anteniice 10 mm 10 mm. 



Tegmina. 7 mm 5.5 mm. 



Post. Fem 10 mm 12 mm. 



Most nearly related to ^. brunneus, but it is easily distinguished 



