368 HETEROMERA. 
Three examples—a pair from Omilteme and a male from Juquila. M. gracilicornis 
is very closely allied to MU. levis, but may easily be distinguished from it by the slender 
antenne in both’ sexes, this difference being especially noticeable in the female sex: in 
the female of WM. levis these organs are much shorter than in the male, and distinctly 
thickened towards the apex. In Sallé’s collection there are four male specimens 
labelled with the MS. name I. gracilicornis, Sallé: one of these, from Juquila, I refer 
to this species, the other three (though they have the antenne unusually slender), from 
Capulalpam and Peras, I treat as an extreme form of WM. levis. 7 
/ 
HENOUS. . 
Henous, Haldeman, in Stansbury’s Exped. to Great Salt Lake, p. 377 (1852) ; Leconte, Proc. Ac, 
Phil. vi. p. 330; Lacordaire, Gen. Col. v. p. 661; Dugés, Bull. Soc. Zool. Fr. 1886, p. 580. 
Nomaspis, Leconte, New Species Col. p. 156 (1866). aa: 
In this genus the elytra are not at all imbricate at the suture, the third antennal 
joint is elongate, and the two portions of each tarsal claw are subequal in length. 
1. Henous confertus. 
Meloe conferta, Say, Journ. Acad. Phil. iii. p. 281 (1824) *; Complete Writings, 11. p. 167. 
Henous confertus, Lec. Proc. Acad. Phil. vi. p. 88307; Journ. Acad. Phil. (2) iv. p. 38 * (nec Dugés). 
Henous techanus, Hald. in Stansbury’s Exped. to Great Salt Lake, p. 377, t. 9. figg. 12-14°, 
Hab. Norva America, Missouri!2, Arkansas!, Kansas*, Texas?®4—MeExtico, San 
Pedro in Coahuila (Dr. Palmer). 
One male specimen from Coahuila, agreeing perfectly with others of the same sex 
from Texas. The pubescence is uniformly black in this species. 
2. Henous cardui. (Tab. XVII. fig. 5, 2.) 
Henous conferta, Duges, La Naturaleza, i. p. 102, t. 1a. fig. 3 (nec Say)’. 
Henous cardui, Dugés, An. Mus. Michoacano, ii. p. 36 (1889) (2) *. 
Hab. Mexico (Sallé, ex coll. Sturm), Oaxaca (Hége), Mazamitla*?, Uruapan I 
Toluca? (Dugés). 
We have received five females and two males of this species. The female only was 
known to Dugés. H. cardui is closely allied to H. confertus, but differs from it by 
the finer and shallower punctuation of the head and thorax, the interspaces between 
the punctures not being granular; the elytra are also less rugosely punctured ; the 
thorax is less convex; the head has a more or less distinct, smooth, impressed median 
line extending from the epistoma to the occiput; the third joint of the antenne is not 
so long as the following two joints united; and the pubescence is brown, with a few 
intermixed ashy hairs. The male has the elytra contiguous for about two-thirds of 
their length, and subconnate towards the base; in the same sex of H. confertus they 
