NORTH AMERICAN COLEOPTERA. 



341 



Auterior and middle femora armed in front of middle with a small tooth. 

 Thorax as wide as long, vaguely sulcate at middle ; head longer than wide, 

 sides nearly straight, slightly convergent posteriorly and at base 

 very abruptly narrowed to a neck ; elytral humei'i obtusely rounded, 



the eostse with short, recumbent, scale-like hairs armatus. 



The characters given in the table are so full as to make any de- 

 tailed descriptions of the species almost unnecessai-y, therefoi-e only 

 such remarks will be made as seem useful to supplement those already 

 given. 

 A. regnlai'is Horn, Trans. Amer. Philos. Soc. xiv, 1870, p. 274. 



The thorax is longer than wide, sides arcuate in front, then ob- 

 liquely convergent to base with a slight sinuation, the median sulcus 

 rather feeble. The hairs at the summits of the costae are short, 

 semi-erect and inconspicuous. The propleurse are coarsely, not 

 closely punctate. Length 4.5-5 mm. ; .18-.20 inch. 



Collected by me originally at Fort Grant, and more recently by 

 H. F. Wickham, at Tucson, about sixty miles further south, in 

 Arizona. 

 A. siilcicollis Horn, Trans. Amer. Philos. Soc. xiv, 1870, p. 274. 



The thorax is decidedly longer than wide, strongly arcuate in 

 front, obliquely narrowed with a distinct sinuation toward the base, 

 the median sulcus very well marked. The elytral humeri are some- 

 what obliquely rounded, the hairs at the summits of the costre short, 

 inconspicuous and scale-like. Propleurai sparsely coarsely punctate. 

 Length 4 mm.; .16 inch. 



Occurs in Owen's Valley, California. I have not seen any other 

 specimens than those collected by myself in that region. 



A. simplex Cas.*— Brownish, head, thorax and legs sparsely clothed with 

 yello'wish, recumbent, scale-like hairs; head oval, longer than wide, widest be- 

 tween the antennje, thence gradually arcuately narrowed to the neck ; thorax 

 longer than wide, slightly narrower than the head, sides arcuate in anterior third, 

 then obliquely narrowed with a feeble .sinuation to base, disc convex with a de- 

 pression- at middle of base; elytra elongate-oval, equally narrowed at apex and 

 base, the humeri obliquely rounded, disc quadricostate, the intervals coarsely, 

 biseriately punctate, the costte, with recumbent scales at summit; propleurse 

 sparsely punctate. Length 3—4 mm. ; .12— .16 inch. 



This species might readily be mistaken for codipennis, but the in- 

 tervals have not the elevated line between the eostse as in that spe- 



«■ Just as the proof sheets of these pages came to hand a pamphlet extract from 

 the Annals of the N. Y. Acad. Sc. vol. v, was received from Capt. Casey, in which 

 the two species were found described on p. 369. I have therefore changed the 

 names given and allowed the descriptions to remain. 



