OOLEOPTERA. 
459 
CoLOBicus, Lat. 
In this and the following subgenus, the tarsi, from the point where 
they are moveable, seem to consist of but four joints, of which the 
three first, much shorter than the last, are entire, and simply furnished 
iinderneath with a greater or smaller number of hairs ; the first as in 
several of the Cleri of Fabric! us, is only visible underneath, where it 
forms a little projection; it is also pilose. The palpi of the Colobici 
and those of the following subgenus are terminated by a joint some- 
what thicker than the preceding one 
In the other Nitidulariae, the artennal club always consists of three 
joints, and the head never projects over tlie mouth. 
Sometimes tlie first joint of the tarsi, as in the Colobici, is very 
short, and the three following ones elongated, equal, entire, and 
simply pilose underneath; the palpi are thickest at the extremity. 
Such is 
Thymalus, Latr. — Peltis, Fab. — Silpha, Lin. 
In those species where the body is almost hemispherical — limbatus 
— the antennal club is proportionally shorter, and the third and fol- 
lowing joints smaller than the second; the tibial spurs are extremely 
small f . 
Sometimes the three first joints of the tarsi, at least those of the 
males, are short, wide, and emarginated or bilobate ; the fourth is 
very small, but slightly or not at all visible ; the maxillary palpi, at 
least, are filiform. 
Here, the tibiae, at least the anterior ones, are widened at the ex- 
tremity in the form of a reversed triangle ; the first joint of the an- 
tennae is usually larger than the second, and the elytra are generally 
truncated posteriorly, or very obtuse. 
In the two following subgenera, the third joint of the antennae is 
evidently longer than the following one, and the antennal club abrupt 
and nearly ox’bicular or oval. 
Ips, Fab. — Nitidula, Oliv. Lat. — Silpha, Lin. 
The body always forming an oblong oval, and depressed ; posterior 
extremity of the abdomen exposed ; one of the mandibles — the left — 
truncated and tridentated at the extremity, and the other widened 
and broadly emarginated or concave at the same end; terminal lobe 
of the maxillee elongated j:. 
Nitidula, Fab. — Nitidula, Strongylus, Herbst. — Silpha, Lin. 
The two mandibles become narrowed near the extremity and ter- 
minate in an emarginated or bifid point. 
Some are flattened, oblong, or ovoid ; the others are orbicular and 
arched or proportionally more convex than the pn ceding. Tims 
♦ Lat. Gener. Crust, et Insect. II, p. 9, and I, x\i, 1. 
•f- See Fabricius, Gyllenbal, and Schcenberr. 
X Some of the species of Fabricius shoiUd apparantly be referred to his genus 
Engis. 
