292 



GEO. n. HORN, M. D. 



tioguisb them. la the sculpture of the uppor surf.ice they are almost 

 precisely identical. 



Occurs from the Atlantic to Colorado and in the south to Texas. 



A. ecarinata n. sp. — Oblong, moderately elongate, rufo-testaceous, shin- 

 ing. Head sparsely finely punctate. Antennal club piceous. Mandibles not 

 dentate at middle. Thorax more than twice as wide as long, slightly nar- 

 rowed in front, apex feebly emarginate, base slightly arcuate, sides moder- 

 ately arcuate, hind angles rounded, surface sparsely punctate. Elytra a little 

 wider than the thorax, oblong-oval, sides feebly arcuate, surface with eight 

 entire rows of punctures, the external slightly less distinct at base but with- 

 out subhumeral stria, intervals punctulate, the alternate with very distant 

 slightly coarser punctures. Metasternum coarsely punctured at the sides, 

 abdomen less coarsely and indistinctly punctured. Length .08 — .10 inch ; 

 2—2.5 mm. 



In the two specimens before me the anterior tarsi are wanting, 

 the male has the middle tibiae slightly arcuate, the posterior femora 

 stouter than in the female and the hind tibiae are straight. In the 

 female the middle tibia is straight. 



The legs are rather stout and the tibiae not by any means slender, 

 resembling those of ohsolefa. The middle tibiae have three quite 

 strong spines on the outer edge. 



The absence of mesosternal carina in this species is certainly a 

 very remarkable character and is otherwise unknown to me in the 

 genus. The general appearance of the antennal club is much like 

 that of Cyrtusa except that the small eighth joint is here distinctly 

 visible. The absence of mandibular tooth is also a departure from 

 the Anisotoma type. From these departures from the typical struc- 

 ture of the genus the present species might be separated generi- 

 cally, but it seems to me that it is merely an aberrant form of 

 the present genus, indicating decided affinities in the direction of 

 Cyrtusa rather opposite to those shown by obsoleta. Were it not 

 that the antennal grooves are wanting I would have considered it 

 an aberrant Cyrtusa. 



Two specimens, western Nevada, Morrison. 



The following species has not been identified : 



" A. lateritia Mann., Bull. Mosc. 1852, ii. p. 345. — Breviter ovata, 

 convexa, rufo-ferruginea, oculis clavaque antennarum nigro-fuscis : 

 thorace transverso, crebre punctato, angulis posticis subrectis; elytris 

 profunde striate punctatis, interstitiis confuse seriato-punctatis. Longit, 

 If lin.; latit. 1 lin. 



" In volatu in insula Sitkha a D. Holmherg semel capta." 



It appears to be a species resembling conferta Lee. 



