a Family of Coleopterous Insects. 629 
mihi); P.thoracicus Don.; P. Fichtelii Don.; and P. pilicornis 
Don. ; the second and third of which he conjectures may pro- 
bably be the sexes of the same species. In the Systema Eleu- 
theratorum 1801, Fabricius adopted the genus Paussus with this 
remark : ** Novum genus et distinctum, at mihi haud rité exa- 
minatum, nec mihi satisfacit character genericus a D. Afzelio, 
in A. S. Linn. datus, sed e novo conficiendus.” The species in- 
serted in this work in the genus are the microcephalus, lineatus, 
and ruficollis, with the addition of another insect named P. fla- 
vicornis, of which he says, ** Animalculum singulare vix hujus 
generis;" which, in fact, does not belong to the family, and 
which I have formed into the genus Megadius, described below. 
Latreille having received three species of the genus from Mr. 
MacLeay, (one of which he submitted to dissection for the pur- 
pose of giving a more detailed account of the formation of the 
trophi than had been given by Afzelius,) published the result of 
his observations in the Histoire Générale, &c. vol. xi., giving 
only the four species recorded in the Systema Eleutheratorum, 
with the same remark upon the P. flavicornis. In the Genera 
Crustaceorum, &c. vol.iii. p. 1., he again detailed the characters 
of the genus, giving as the type the microcephalus, and adding 
a description of Donovan's P. thoracicus, under the name of tri- 
gonicornis. 
Schönherr in the Synonymia Insectorum, vol. i. part 3. gives 
the following list of ten species belonging to the genus, as at 
that time constituted, (including two new species, but omitting 
those described by Donovan, except the P. thoracicus, which it 
is evident he was only acquainted with through Latreille's syno- 
nymical reference in the Genera Crustaceorum, &c.) ; 1. P.micro- 
cephalus Linn. ; 2. spherocerus Afz. ; 3. lineatus Thunb. ; 4. tri- 
gonicornis Latr. (thoracicus Don.) ; 5. denticornis (a new species 
described under this name by Gyllenhal in the Appendix to 
the 
