Memoirs on the coleoptera

274
MEMOIRS ON THE COLEOPTERA
within the humeri; head nearly similar but gradually increasing
in width to the base, where it is about as wide as across the eyes;
antennae ( 9 ) notably more slender and very pale brown in color
throughout, the last four joints abruptly much more distinctly
shorter than the seventh and more abbreviated, the eighth only
about twice as long as wide; prothorax shorter and more transverse,
similarly more narrowed basally than apically but differing in being
widest well before and not at the middle; surface nearly as in the
preceding, the five callous spots isolated amid the dense coarse
punctures; scutellum smaller, obtusely parabolic, as wide as long;
elytra much wider than the prothorax, about twice as long as wide,
very coarsely, loosely punctate throughout; legs pale brown, the
femora blackish, the tarsi very slender. width 3.1 mm. Maine
Length (9) 10.0 mm.;
terminata n. sp.
Although at first glance there seems to be but little diversity in
the head and prothorax, closer observation shows not a little,
especially in the shape of the latter and in the formation toward
base in the former.
Dr. Horn states (Tr. Am. Ent. Soc., 1883, p. 289) that the
Callidium nicolas of White, "is merely the dark form of Hylotrupes
ligneus Fab." As there are several dark forms,
I am unable to
determine which, if either, of the above black species should be
identified as nicolas White.*
Hemicallidium n. gen.
The type and only known species of this proposed new genus is
the Physocnemum amethystinum of LeConte (Proc. Acad. Phila.,
VI, p. 234). It differs from Hylotrupes, where it is now listed, in
its different antennal structure, conforming in this respect with
Anocomis preceding, in its very much larger ocular emargination,
which however does not come quite so near to completely dividing
the eyes as it does in Anocomis, in the less widely separated coxae,
more slender femora and, as in Anocomis, much more securiform
palpi; also in having no eroded spots on the elytra, the latter being
in form and sculpture very nearly as in the restricted Callidium.
It differs from Anocomis in the very rapidly and strongly, basally
* The description of nicolas given by White (Cat. Col. Br. Mus., VIII, p. 321)
runs as follows: Of a blackish-brown; head punctured and with scattered grayish hairs.
Thorax punctured irregularly, with five smooth spaces on the back, two in front,
three behind, the central the largest; scutellum black. Elytra of a reddish-brown,
with a transverse ochrey band a little behind the middle and a narrow ochre-colored
margin from the shoulder to the band. Hab. . Length 4 lines.