MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 75 



Synopsis by Dr. Horn of the Species of North American Anophthaxmus.* 



Penultimate joint of maxillary palpi longer than the last joint. Base of elytra ohliquely prolonged. Thorax 

 much longer than wide; hind angles rectangular; base truncate. Body glabrous tellkampfi. 



Penultimate joint equal to last, or even slightly shorter. Elytra shining, not pubescent. Thorax longer than 

 wide. Third angle of thorax strictly rectangular ; base squirely truncate. Elytra elongate oval, feebly convex • 

 stria 3 obsolete. Form slender tenuis. 



Hiud angles acute, slightly prominent, base distinctly prolonged at middle. Elytra broadly oval, more convex; 

 striae moderately deep and punctured. Form robust menetriesi. 



Elytra subopaqne, distinctly pubescent. Thorax as wide or wider than long. Elytral base never obliquely pro- 

 longed. Sides of thorax gradually narrowing to base, scarcely sinuate. Hind angles rectangular, or nearly so, but 

 never acute and prominent. Thorax at base as wide as long eremita. 



Thorax at base narrower than long ; at widest portion not wider than long pusio. 



Sides of thorax sinuately narrowing to base, hind angles acute, prominent outwardly. Elytra very distinctly 

 pubescent pubescens. 



We add descriptions, taken from Dr. Horn's article, of the less-known species, A. audax Horn excepted. 



Anophtlialmus tenuis Horn. PI. XX, fig. 2. — Pale rufo-testaceous, shining. Head slightly darker in color, oval, 

 and arcuately bi-impressed. Thorax broader than the head, slightly longer than broad, and sinuately narrowing to 

 hiud angles, which are exactly rectangular ; median line distinctly impressed in its entire length, basal impression 

 deep; base of thorax truncate. Elytra elongate oval, feeble convex, at base slightly flattened; two-thirds longer 

 than broad. Humeri obtusely rounded ; surface with feeble traces of strise and three dorsal setigerous punctures on 

 each elytron in or nearest to the position of the third stria. Body beneath similar in color to the upper surface; legs 

 somewhat paler. Length, .18 to .24 inch=4.5 to 6 mm . 



This species is closely allied to menetriesii, Motsch. (angulatus Lee), but differs by its more elongate and less robust 

 form and less convex surface. The elytra are smoother and with very feeble traces of striaa. The two species differ 

 especially in the form of the hinder thoracic angles and base of thorax. In menetriesii the angles are acute, slightly 

 prominent externally, and the base of the thorax slightly prolonged, while in the present species the angles are 

 strictly rectangular and the base truncate. 



A. eremita Horn (PI. XVIII, fig. 3, XX, fig. 3). — Pale. Rnfo-testaceous, feebly shining. Head oval, arcuately bi- 

 impressed impressions moderately deep, intervening space feebly convex. Thorax wider at widest portion than long ; 

 sides moderately rounded in front, gradually narrowed to base ; hind angles rectangular; base truncate and as wide as 

 length of thorax ; disk feebly convex, median line distinctly impressed, basal transverse impression moderate. Elytra 

 oval, less shining than thorax, and sparsely clothed with very short erect pubescence; strias obsolete: three dorsal 

 punctures on the line of the third stria. Length, .20 inch=5 mm . 



The only species with which it might be confounded is that previously described by me under the name pusio, 

 and although differing very notably on comparison in their general aspect, the points of difference are not easily 

 made plain in a description. The present species is in all respects broader and less depressed without being convex, 

 as in menetriesi. The thorax is broader, less narrowed behind, and sides more rounded. The elytra are less shining 

 and the pubescence more distinct, although in both species the pubescence can only be observed by holding the 

 specimen between the eye aud the light, and then only with a good power. In the three species at the head of the 

 accompanying table no signs whatever of pubescence can be observed. The elytral striie are here also entirely oblit- 

 erated; faint traces are discernible only at the base. The basal margin is not prolonged. The few remarks on the 

 comparison of tenuis with the two as yet unkuown species described by Motschulsky apply equally to this one. 



A. pusio Horn (PI. XX, fig 1). — Pale brownish testaceous. Head oval, slightly longer than broad; longitudi- 

 nal impression faint, surface very finely alutaceous. Thorax trapezoidal, slightly broader than long, feebly emargi- 

 nate anteriorly, sides moderately rounded anteriorly, slightly sinuate posteriorly, base feebly bisiuuate, and emargi- 

 nate at middle; surface .smooth, shining, with median longitudinal line and a broad impression within each hind 

 angle, angles rectangular. Elytra oval, sides moderately rounded ; humeri distinct, obtuse ; surface feebly striate, 

 and sparsely covered with suberect, very short pubescence. Leugth, .15 inch. 



This species may be readily distinguished from any of our others by the form of thorax, as well as by the 

 pubescence coveriug the elytra and under surface of the body. The thorax is slightly broader than long, trapezoidal, 

 narrower behind. The surface is less convex than any of the described species of our country, not only that of the 

 thorax, but also of the elytra. The humeral angles of the elytra are well defined, and the bases of the elytra nearly 

 transverse and not obliquely produced, as in tellkampfii. The head is relatively broader than in the glabrous species, 

 and the, thorax scarcely broader than the head. In this species the meutum tooth becomes very broad and obtuse, 

 approaching in this respect Aphamops, in which the mentum has no tooth. The upper surface of the body is pro- 

 vided with setae arising from punctures, those on the head being short. The thorax has one on each side about its 

 middle : tho elytra have three each, arranged in a row, one near the base, another median, and a third near the 

 apex. Collected in Erhart's Cave, Montgomery county, Virginia, by Prof. E. D. Cope. 



A. pubescent Horn (PI. XX, fig. 4). — Pale testaceous, shining. Head .oval, attenuate anteriorily, finely aluta- 

 ceous, and with two longitudinal, faintly impressed lines convex internally. Thorax moderately convex, glabrous, 



* Descriptions of new Coleoptera of the United States. Trans. Amer. Ent. Soc, iii, Nov., 187L 



