236 PROCEEDINGS OF THE ACADEMY OF 



form a mass a little longer than the ninth joint. Palpi with the last joint 

 oval, truncate (?). Head convex beneath, with a deep, nearly semicircular 

 excavation behind the mentum ; the bottom of this excavation is smooth, but 

 opake ; mentum large, trapezoidal. Mandibles strongly dilated at the base. 

 Prothorax narrowed in front, and rounded at the apex, deeply excavated be- 

 neath for reception of head. Prosternum short, concave, declivous, widely sepa- 

 rating the anterior coxas, which rise to the level of the metasternum, and are 

 dilated into a transverse, horizontal plate. Mesosternum invisible, (probably 

 concave, and nearly perpendicular.) Metasternum tolerably large, not chan- 

 nelled ; produced in front between the middle coxa? into a short and deeply 

 emarginated lobe, which receives the end of the antennae ; declivous each 

 side at the anterior part, and deeply excavated for the reception of the middle 

 feet, excava'ion distinctly limited by an elevated line; side pieces very nar- 

 row, nearly concealed by the elytra. Plates of hind coxae gradually widened 

 externally. First ventral segment deeply excavated for reception of hind feet ; 

 segments 2 4 gradually diminishing in length, the third and fourth sutures 

 double, (that is, composed of two approximate lines.) Legs slender, tibiae 

 uot dilated, tarsi robust, first joint scarcely longer. Elytra uniformly 

 sparsely punctured, entirely destitute of striae or rows of punctures. 



This singular genus is remarkable for the form of the antennae. The dila- 

 tation of the anterior coxae shows a relation to Theca, while the manner in 

 which the antennae are folded between the coxae, in a sternal excavation re- 

 calls the more typical A n o b i a. In the arrangement of the sternal pieces, 

 and close contractility of the feet some resemblance toCh elonarium can 

 also be observed. It resembles very much the figure of Mesoccelopus niger, 

 Duval, but in that genus the antennas are serrate. 



1. Eu. n i t i d u s, elongato-ovalis, convexus, niger nitidus, glaber, supra parce 

 subtiliter punctatus, abdomine punctato, metasterno parce fortius punctato, 

 antennis piceis, tibiis tarsisque dilutioribus. Long. -09 12. 



Western States, Kentucky, (Mr. Wild,) Illinois, (Mr. Walsh.) I have also 

 a specimen marked as collected by Mr. Xantus, at Cape San Lucas, but I re- 

 gard the locality as doubtful. The surface above is sparsely and finely punc- 

 tured, the punctures at the middle of the thorax and hinder part of the elytra 

 being less distinct ; the thorax is a little wider than its length, narrowed in 

 front, rounded at the apex, feebly Insinuate at base, transversely very convex, 

 sides not margined, the true margin being very much inflexed. Elytra des- 

 titute of striae, suture feebly elevated. Beneath the abdomen is tolerably 

 deusely punctured, the third and fourth ventral sutures composed of two ap- 

 proximate lines ; the metasternum sparsely but strongly punctured, middle 

 and front feet densely punctulate ; inflexed sides prothorax densely punctured. 



2. Eu. puuctulatus, ovalis valde convexus, niger nitidus, glaber sub- 

 tiliter parce puuctulatus, elytris prope basin intra humeros oblique impressis. 

 Long. -12. 



One specimen from Louisiana, in Mr. Ulke'g collection. Differs from Eu. 

 nitidus by the broader form, and much more finely punctured elytra : the 

 basal impression is quite distinct, and is just inside of the humeral elevation. 

 No trace of a similar impression is visible in the five specimens of the pre- 

 ceding species now before me. 



3. Eu. p u d i c u s, subcylindricus, piceus opacus, alutaceus, dense subtilfrter 

 sericeo-pubescens, obsolete haud dense punctulatus, antennis rufo-piceis, ar- 

 ticulis duobus ultimis arete applicatis, praecedente conjunctis longiore. 

 Long. -19. 



? Anobium pudicum Boheman, Eugen. Resa, 86. 



One specimen from Lower California, given me by Mr. Ulke. Very 

 different in form and appearance from Eu. nitidus, but without any marked 

 generic distinction. The form is a little more robust than Ernobius mol- 



[Oct. 



