PENETA. | 141 
been required ; several of these contain one or two species only, as is also the case with 
others inhabiting North America. 
Taken as a whole, the species of this group are, in spite of their usually sombre 
colours, interesting on account of the exceedingly good characters afforded by the males 
of many species, characters often of generic value: in some genera, Uloma, Uleda, and 
Pheres, the anterior (and sometimes the intermediate) tibiz are more or less sinuous and 
dilated, and often coarsely denticulate on their outer edge, or armed on the inner side 
or beneath with a sharp tooth; others, the well-known Gnathocerus and allies, Ulosonia, 
Sitophagus, and Doliema, have the head armed with long (curved or horizontal) horns ; 
these latter having the legs thin and similar in both sexes. Other genera, Telchis, 
Peneta, Cleolaus, Arrhabeus, and Diedus, all containing species of small size, are very 
convex; the antenne with a distinct 2- or 3-jointed club, the two front pairs of 
tibiee coarsely denticulate on their outer edge (Diedus excepted), and the sexes (Peneta 
excepted) externally similar; Peneta approaching Daochus of the preceding group, 
but wanting the long exserted mandibles. 
In the male of Antimachus the head is armed with a long and erect horn (broadly 
dilated and bifurcate at the apex), the anterior angles of the thorax produced into a long, 
horizontal, tooth-like projection, and the anterior tibie (though smooth on their outer 
edge in both sexes) triangularly extended on their inner side in the middle. In Alegoria 
the penultimate joint of the tarsi is distinctly sub-bilobed. Mophis and Asymnus approach 
the ‘‘ Diaperides ;” in the males of one or two species of Sitophagus and Doliema the 
antenne are long, and with the joints subtriangular, but in the same sex of other new 
species described here these organs are normal, and resemble those of the females. 
Some of the species are perfectly flat (Doliema), others cylindrical (Iccius, &c.); a 
few (Gnathocerus and allies, Doliema frontalis, and Sitophagus dilatifrons) have the 
head expanded and foliaceous anteriorly in the male; some have a very broad and 
deep transverse excavation on the anterior disc of the prothorax, ¢. g. in the male of 
Antimachus, and of some species of Uloma, and probably in both sexes of Cleolaus 
and Telchis. 
The whole of the Central-American species are probably of subcortical habits; one 
or two have apparently taken subsequently to a different mode of life, having been 
(like other species now rapidly becoming cosmopolitan) found in bad flour. 
PENETA. 
Peneta, sect. (1) A, Lacordaire, Gen. Col. v. p. 319, nota (1859). 
I here retain the generic name Peneta solely for the P. lebasit group as defined by 
Lacordaire. The other species, notably P. sommeri, differ in so many important 
structural characters, as pointed out by Lacordaire, that I do not feel justified in 
considering them congeneric. It is probable that, judging from examples of P. lebasit 
