144 GEO. H. HORN, M. D. 



One specimen, Veta Pass, Colorado. Of the same form as ameri- 

 caiiHs but larger and with differently dentate tibiae. 



The species now known to us of Teretrius may be separated in the 

 following manner : 



Mesosternum ■with entire marginal line. 



A short oblique stria on each elytron obliqnulus Lee. 



Elytra without strise. 



Middle tibiae bidentate at middle placitiis n. sp. 



Middle tibiee tridentate aiuericauus Lee. 



Mesosternum without marginal line. 



Middle tibise bidentate at middle niontanus n. sp. 



In the preceding descriptions and table in counting the spinules or 

 teeth of the middle and posterior tibiae no account is taken of the 

 two which are present in all the species at the outer angle of the 

 tip, only those are counted which belong properly to the edge of 

 the tibia. 



GEOTRUPES Latr. 

 O. occidentalis n. sp. — Form of semiopacus, color above brilliant violet 

 changeable to cupreous, beneath steel-blue. Clypeus oval, coarsely punctured, 

 at middle with a short triangular horn slightly prolonged in carina toward the 

 front, vertex smooth, above each eye a moderate tubercle. Thorax smooth, a 

 very few obsolete punctures along the margin and the usual fovea at the side, 

 base with deeply impressed marginal line which is entirely obliterated on each 

 side except at the angle. Elytra moderately deeply striate, striee subcrenately 

 punctured, intervals moderately convex, margin moderately dilated. Body 

 beneath sparsely clothed with brownish hair. Anterior tibiae 7-dentate, the 

 teeth gradually decreasing in size above. Length (including head) .60 inch; 

 15 mm. 



This species, the only one known from California, belongs to the 

 Cnemotrupes group as defined by Mr. Jekel. I have however but 

 one female, but in this group the first joint of the middle tarsus of 

 both sexes equals the three next together while it is shorter in the 

 Onychotrupes group. The elytral margin is about as much developed 

 as in semiopacus and much less than in chalj/bxus recently de- 

 scribed by Dr. Leconte from Florida. The latter has also the thorax 

 nearly impunctate but it may be very easily known by the obsolete 

 elytral striae. 



One specimen from Havilah,* California, given me by Mr. Henry 

 Edwards. 



The following dichotomous table is given to aid the student in 

 distinguishing our species. It is needless to say that it is purely 

 empirical and must not supplant the arrangement proposed by Jekel, 



* Mr. Edwards informs me that Havilah is a new settlement in the Tulare 

 Valley east of Visalia near the base of the Sierra Nevada. 



