50 INSECTA. 
with a strong lateral border, and in which the body is but slightly 
convex above, compose the genus Eurynorvus of Kirby *. 
Others, in which the body is evidently more convex above, and the 
thorax is transversal and but very slightly bordered, form the Iso- 
cerus, Meg. De}. + 
In the males of the last of the Pedini, the three first joints of the 
two anterior tarsi, always strongly dilated, diminish progressively 
in breadth, and the fourth is very small. The posterior thighs of 
the same individuals are concave and silky underneath t; the body 
is oval andthe thorax slightly bordered, widening from before poste- 
riorly or slightly narrowed behind, always terminated posteriorly 
and insensibly by a prolonged and pointed angle. Such are the true 
Pedini of Dejean or the PEepinus, De}. § 
There, the anterior margin of the head is entire or unemarginate 
in several. The four anterior tarsi of the males are equally, or 
almost equally dilated. The form of the body, and that of the tho- 
rax in particular, is still similar to that of the last Pedini. 
Those, in which the anterior margin of the head still presents an 
emarginaticn, form the genus 
Biarrinus, Dej. || 
Those in which it is entire or unemarginate, the 
Puatyscenis, Lat. J 
We now come to Melasoma, provided with wings. Their body is 
usually oval or oblong, depressed or but slightly elevated; their 
thorax square or trapezoidal, and its posterior extremity as wide as 
the abdomen. The palpi are larger at the extremity; the last joint 
of the maxillary palpi has the figure of a reversed triangle, or is secu- 
riform; the mentum is but slightly extended in width *, and leaves 
the base of the maxillze exposed. 
These Insects compose the third and last tribe of the Melasoma, 
that of the TENEBRioniTEs, formed of the single genus 
'TENEBRIO. 
As originally arranged by Fabricius, and to which we will annex his 
Opatrumand Orthocera; they will serve for types of as many parti- 
cular divisions. 
* Eurynotus muricatus, Kirb., Lin. Trans, XII, xxii, 1. See Platynotus striatus, 
Scheenh., Synon. Insect, I, 1, tab. ii, 6. 
+ Catalogue, &c., Dej., p. 65. 
t+ The underpart of the same thighs is also silky in the male Heliophili. 
§ Catalogue, &c., Dej., p. 65. 
|| Dej., Catalogue, &c., p. 66.—Blaps tihidens, Scheenh., Synon. Insect., I, i, tab. 
Looe 
4 Dej., Ibid.; Fisch., Entomog. Russ., II, xx, 1—5. 
** The Epitragi, by their jaws, which are armed on the inner side with a tooth, 
in a systematic arrangement, should be placed in this tribe; they would be removed 
from all the subgenera of which it is composed, by their much larger mentum that 
covers the origin of the maxille: but in a natural order, it appears to me they 
should be placed near Helops. 
