73 
PLATE LXVIII. 
MONOGRAPH OF THE COLEOPTEROUS FAMILY PAUSSID. 
—— 
(Part III.) 
Tue insects belonging to this curious family, which remain to be 
described in the present monograph, are distinguished from all 
those described in the two preceding papers (except Hylotorus 
Bucephalus) by apparently possessing only two distinct joints in 
the antennz ; the second of which is very large and irregular in 
its construction, occasionally exhibiting the appearance of constric- 
tions, apparently indicating the situation of articulations. This is 
the case, for example, in a transverse impression near the base of 
the great joint, m the species figured in the upper part of the 
accompanying plate, as well as in Platyrhopalus aplustrifer ; 
whilst the indentations along tne hinder margin of the same 
joint, in some of the species of Paussus, may also, perhaps, be 
considered as indicating the same rudimental articulation. From 
Hylotorus, the species remaining to be described are distinguished 
by the possession of a narrow contraction of the head behind the 
eyes, forming a kind of neck, and by the want of the two ocelli, 
or ocelli-like tubercles, on the crown of the head. 
These species, from the construction of the labial palpi, form 
two generic groups: one (containing the old types of the genus, 
and therefore retaming the old generic name, Paussus) having the 
terminal joint of the labial palpi very long and slender, and the 
two basal joimts small; and the other having the two terminal 
joints of equal length, and generally possessing a large, broad, and 
subdepressed club to the antennee, whence, upon the separation of 
this group from the former, m my paper in the Linnean Trans- 
actions, I applied to it the generic name of Platyrhopalus. It is to 
this genus that our attention is now to be directed. 
PLATYRHOPALUS, Westw. 
(Trans. Linn. Soc. Lond, voL 16, p. 654.) 
Corpus depressum. Capué thorace minus, porrectum subquadratum, postice in collum breve 
contractum. Oculi magni prominuli laterales. Labrum sub-semicirculare tenue setis 
duabus antice instructum (fig. 1 ¢). Mandibule cornex tenuissime valde arcuate apice 
in dentem acutissimum terminato, interne uni- vel bi-dentatr ; membranaque tenui sub- 
