232 [JANUARY, 
large shallow elliptical punctures. This and the preceding seem related to C. 
mexicanus Schaum (Germ. Zeitschr. 3, 256; Am. Ent. Fr. 2d ser. 2, pl. 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 Cetonix, 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. nitens, nigro-castaneus, nitidus, breviter setosus, thorace parce vario- 
loso, antrorsum valde angustato, basi subito constricto, angulis posticis auricu- 
latis, anticis foveatis, elytris inzequalibus 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, shghtly 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, I follow Schaum’s example in merging the two genera 
together. 
Among our previously described Cremastochilus, may also be observed con- 
siderable difference 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 castanee. 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. politus Schaum (Psilocnemis leucostice 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 
the republic; which event, however desirable for the increase of our fauna, 
cannot alter the preordained laws of distribution of species. 
Autorocyemis Lec. (Nitidularie, Peltides.) 
Oculi duo laterales prominuli; autenne 11-articulate, articulis tribus ultimis 
maioribus, distantibus ; frons concava, apice emarginata; tibie posteriores mu- 
tice; antice extus serrate, spina apicali uncata. 
I 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 tibie are very hairy ; the two posterior pairs of tibie not spinous, 
with two terminal spurs, of which one is so small as to be indistinct; the 
anterior tibie are slightly compressed, the outer margin serrate, with small 
distant teeth, of which the lowest is most distinct; the apex is obliquely trun- 
