382 IN SECT A. 



rior part of the head projects in the manner of a semicircular flat- 

 tened clypeus. covering the mandibles and other parts of the mouth. 



Colobicus, Lat. 



In this and the following subgenus, the tarsi, from the point where 

 they are movable, seem to consist of but four joints, of which the 

 three first, much shorter than the last, are entire, and simply furnish- 

 ed underneath with a greater or smaller number of hairs; the first, 

 as in several of the Cleri of Fabricius, 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 somewhat thicker than the preceding one(l). 



In the other Nitidulariae, the antennal club always consists of 

 three joints, and the head never projects over the mouth. 



Sometimes the 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 limba- 

 tus the antennal club is proportionally shorter, and the third and 

 following joints smaller than the second; the tibial spurs are ex- 

 tremely small(2). 



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 orbicular 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 



(1) Lat., Gener. Crust, et Insect., II, p. 9, and I, xvi, 1. 



(2) See Fabricius, Gyllenhal, and Schoenherr. 



