224 PROCEEDINGS OF THE ACADEMY OF 



only moderately deflexed ; the prothorax not excavated beneath for its recep- 

 tion, and the legs not received in cavities. 



The antennae haveihe intermediate joints narrow, and the last three dilated 

 and sometimes much elongated ; they are not received between the coxae in 

 repose, but rest loosely upon them, and are 11-jointed in our genera. The 

 anterior aperture of the prothorax is circular. In our genera the thorax is 

 margined, and the elytra are not striate, though European genera exist in 

 which these characters are wanting. The ventral segments are never connate. 

 Our genera are related as follows : 



Anterior coxae contiguous, prominent, conical E r n o b i u s. 



Anterior coxae separated by the presternum : 



Prosternum moderate, tarsi narrow Ozognathus. 



Presternum very short, tarsi dilated Xestobium. 



ERNOBIUS Thorns., Skand. Col. i. 88, (1859 ;) v. 146, (18G3.) 



This genus, first recognized by C. G. Thomson, in his excellent work on the 

 Coleoptera of Skandinavia, has been since described by other authors, as 

 follows: Liozoum Mulsant & Rey, opusc. Ent. xiii. 92, (18G3); Coleopt. 

 de France, Terediles, 133, (18G4) ; Dryophilus Lee, Class. Col. 205, 

 l 18G2) ; P h i 1 oxyl o n Lee., ibid. ; Conophoribium Chevr., Ann. Ent. 

 Tr., 1861, 391. 



I divided the species into two genera, on account of the difference in the 

 length of the prosternum in front of the coxae, but a renewed examination 

 convinces me that this character is of merely specific value. 



The genus will be readily recognized by the characters above given. In ad- 

 dition to them, the middle coxae are nearly contiguous, the tibiae are slender, the 

 tarsi are narrow, with the first joint elongated, and the fifth joint not dilated, 

 but slender and elongated. The plates of the hind coxae are very narrow, and 

 not dilated internally. The sixth ventral segment can usually be seen. 

 The species known to me may be grouped as follows : 

 Ninth joint of antennas shorter than the 4th 8th 

 united ; (joints 5 8 equal in thickness ;) 

 5th and 7th longer than sixth ; 

 Thorax not transversely impressed ; 



Sides of thorax much rounded 1. mollis. 



Sides of thorax less rounded 2. punctulatus. 



Thorax with a vague transverse impression 3. alutaceus. 



Joints 6th, 7th and 8th equal in length 4. d e b i 1 i s. 



9th joint of antennae as long as the 4th 8th united : 



Elytra densely finely granulated 5. gran ul atus. 



Elytra finely not densely punctulate 6. marginicolli s. 



9th joint of antennae as long as the 1st 8th united... 7. tenuicornis. 



1. E. mollis Thorns., Skand. Col. v. 146; Dermestes mollis Linn.; Ano- 

 bium molle Fabr., &c. ; Liozoum molle? Muls. & Rey; Anobium convexifrons 

 Mels., Proc. Acad. Nat. Sci., ii. 309. 



A common European species, introduced in the Atlantic States. The thorax \ 

 is twice as wide as its length, and is much rounded on the sides, which are 

 broadly margined; all the angles are rounded ; there are two vague rounded ' 

 basal impressions, and a scarcely perceptible medial elevation. 



The fifth joint of the antennae is longer than the fourth, the fifth to the eighth 

 joints are equal in thickness, oblong, and the sixth is shorter than the ad- 

 joining ones ; the eighth is a little shorter than the seventh, the ninth, tenth 

 and eleventh are equal in length, and each is a little longer than the seventh 

 and eighth united. 



2. E. punctulatus. Anobium punct. Lee, Proc. Acad., 1859, 284. 

 California. Related to the preceding, but the thorax is more transverse, 



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