116 GEORGE II. HORN, M. D. 



field of vision, deceive into the belief tliat the spinules are unequal. 

 In old specimens of those species in which the clypeus is denticulatej 

 the teeth are apt to be worn down as also the spurs of the tibiae, and 

 the large teeth of the anterior tibiae. In those that are pubescent, 

 various accidental causes may remove the hairs, and experience alone 

 here, as well as in the previously noted accidents, must be our 

 guide. 



Group C contains but one species. Form robust, clypeus rather 

 deeply emarginate at middle, bounded by a tooth on each side and 

 with another smaller, more acute tooth at one-third the distance to- 

 ward the genae. Front distinctly trituberculate along the line of the 

 frontal suture. Prothorax with base distinctly margined. Scutellum 

 small, elongate oval. Posterior tibial apical spinules short, equal. 

 First joint of hind tarsi shorter than the upper spur, equalling the 

 two following. Anterior tibiae above the upper tooth strongly 

 serrate. 



A. denticulatus, Hald. Journ. Acad. Ser, II, vol. i, p. 104. — Oblong, piceous, 

 shining. Head densely and coarsely punctured. Thorax convex, -with sparsely 

 placed coarse punctures, denser however at the sides; anterior angles paler. 

 Elytra broader behind the middle, very convex and obtuse behind, deeply 

 striate, striae coarsely and closely punctured, interspaces feebly convex, with 

 very distant fine punctures, sutural interspace brownish-ferruginous. Body 

 beneath ferruginous, middle and hind femora and metasternum piceous. No 

 sexual characters have been noticed. Length .30 inch; 7.5 mm. 



The entire margin of the body is fimbriate with yellowish hairs, 

 also the under surface and legs, the hairs of the hind tibise are especi- 

 ally long, giving the species the air of an uEgialia. 



Occurs along the eastern base of the Rocky Mountains, from Bitter 

 Root Valley to New Mexico. 



Group I) contains one species introduced from Europe, and now 

 gradually spreading over our country. Head distinctly tuberculate, 

 front broadly rounded, feebly emarginate at middle and slightly sinu- 

 ate in front of the genae, which are obtusely rounded and not promi- 

 nent. Thorax margined at base, sides sinuate near hind angle. First 

 joint of hind tarsi shorter than upper spur and slightly longer than 

 the two following joints. Outer edge of anterior tibiae with several 

 rather coarse punctures above the upper large tooth. 



A. fimetarius, Linn. Faun. Suec. lZA;nodifvons, Randall, Bost. Journ. ii, 20. — 

 Head and thorax black, the latter frequently with anterior angles rufous 

 Elytra pale ferruginous. Length .34 inch; 8.5 mm. 



As this is a well known European species, introduced along the 

 seaboard and Canada, a detailed description has been omitted, also the 



