a Family of Coleopterous Insects. 629 



mihi) ; F.thoracicusT)or\.', 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 Sy sterna Eleu- 

 theratorum 1801, Fabricius adopted the genus Paussus with this 

 remark : " Novum genus et distinctum, at mihi haud rith exa- 

 minatum, nee 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, lineaius, 

 and ritficollis, with the addition of another insect named P. Jla- 

 vicornisy 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 GSn6rale, ^c. vol. xi., giving 

 only the four species recorded in the Systema Eleutheratorum, 

 with the same remark upon the P.flavicornis. In the Genera 

 Crust aceor urn, <^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. 



Schbnherr 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. spharocerus 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 



