232 [January, 



large shallow elliptical punctures. This and the preceding seem related to C. 

 mexicanus Schaii77i (Germ. Zeitschr. 3, 256 ; Am. Ent. Fr. 2d ser. 2, pi. 11, 

 fig. 8), but the posterior angles are not tuberculate. 



Two specimens of this species were found by me on the Arkansas River, near 

 the Rocky Mountains ; one of them is now in the collection of Dr. Schaum. 

 Descriptions of this and the next species were furnished by me four years ago 

 to Mr. Westwood, for an anticipated monograph of Cremastochilus, which, how- 

 ever, although quoted in Schaum's Catalogue of Oetoniae, appears not to have 

 been published ; and therefore considering them as interesting additions to our 

 fauna, I take the present opportunity of making them known. 



3. C. n i t e n s, nigro-castaneus, nitidus, breviter setosus, thorace parce vario- 

 loso, antrorsum valde angustato, basi subito constricto, angulis posticis auricu- 

 latis, anticis foveatis, elytris inaequalibus sat dense punctatis, mento valde 

 concavo, rhomboideo. Long. -43. 



Missouri Territory. Brownish black, shining. Head strongly scabrous ; 

 mentum deeply concave, subrhomboidal, anteriorly broadly rounded, lateral and 

 posterior angles distinct. Thorax one half wider than long, strongly narrowed 

 in front, rounded on the sides, very strongly constricted near the base, so that 

 the base is not wider than the apex; surface sparsely and deeply punctured, 

 with very short yellow bristles proceeding from the punctures ; anterior angles 

 not acute, deeply foveate, posterior angles forming a round shining tubercle, 

 separated by a deep cut from the body of the thorax ; base very much depressed, 

 smooth. Elytra deep red towards the middle, flattened, slightly uneven, covered 

 with moderately close rounded shallow punctures, from which proceed short 

 yellow hairs. 



These three species seem to belong to Burmeister's genus Psilocnemis, by 

 the form of the lower lip, but as there is not a complete resemblance among 

 them in this respect, 1 follow Schaum's example in merging the two genera 

 together. 



Among our previously described Cremastochilus, may also be observed con- 

 siderable difl^erence in the form of the lower lip. That organ is only slightly 

 emarginate posteriorly in C. variolosus, while it is deeply cleft in C. Harrisii, 

 canaliculatus and castanea?. C. junior (Westw.), quoted in Schaum's Catalogue 

 of Lamellicornia melitophila, is unknown to me, nor have I in my collection 

 any specimens from the Atlantic States, which cannot be referred to the four 

 species just mentioned. 



C. p o 1 i t u s Schaum (P.s-/7orf!??i?'.s /e?ico5^/c Burm.) is considered as North 

 American on the authority of a single specimen communicated by Mr. Gory to 

 Burmeister. The fact that the Western species above described agree in the 

 absence of the emargination of the lower lip, induces me to believe that the 

 species in question is really Mexican. The distinction of locality in regard to 

 North America is very frequently not attended to with sufficient care by Euro- 

 pean Naturalists, who possibly have a prophetic eye towards the extension of 

 ihe republic ; which event, however desirable for the increase of our fauna, 

 cannot alter the preordained laws of distribution of species. 



Alloeocnemis Lee. (Nitidularia?, Peltides.) 



Oculi duo laterales prominuli; aatetmfc 11-articulatae, articulis tribus ultimis 

 maioribus, distantibus ; frons concava, apice emarginata ; tibiae posteriores mu- 

 ticse ; anticae extus serratae, spina apicali uncata. 



1 have merely given the characters to distinguish this curious genus from the 

 genera described by Erichson (Germ. Zeitschr. 5, 445, &c.) ; the only two allied 

 to it by the form of the eyes are Egolia and Acalantha, from which it is very 

 distinct by having three enlarged antennal joints. Its form is nearly that of 

 Nemosoma, but its greater size renders its appearance very singular. The 

 pectus and tibine are very hairy ; the two posterior pairs of tibi;p not spinous, 

 with two terminal spurs, of which one is so small as to be indistinct; the 

 anterior tibiae are slightly compressed, the outer margin serrate, with small 

 distant teeth, of which the lowest is most distinct; the apex is obliquely trun- 



I 



