630 Mr. J. O. WrsTwoop on the Pausside, 
the volume, but distinct from Donovan's denticornis) ; 6. ruber 
Thunb.; 7. Bucephalus (a new species, also described in the 
Appendix by Gyllenhal); 8. ruficollis Fabr. ; 9. flavicornis Fabr. 
(without the expression of any doubt as to its belonging to this 
genus); and 10. the Hispa bihamata of Linnzus, with the re- 
mark, *An hujus generis?” Dalman in the Analecta Entomo- 
logica has published some observations upon the propriety of 
forming the Bucephalus into a new genus under the name of 
Hylotorus, and upon the affinities of the P. flavicornis Fabr. : 
and the same author, in a very interesting paper in the Swedish 
Transactions for 1825, upon insects found in the gum copal, 
has described an insect under the name of Paussus cruciatus, 
which, although evidently belonging to the family, materially 
recedes from the genuine Paussi, and which I have consequently 
considered as the type of the genus Trochoideus subsequently 
described. | 
The above are, I believe, the only works in which any mate- 
rial original matter has been published upon these insects ; and 
I cannot, therefore, but rejoice at being enabled to increase the 
lists given by Schonherr and Donovan by the addition of several 
other undescribed species. 
The species vary most materially from each other in the 
formation of the terminal joint of the antenne: these parts 
therefore, together with the size and colour of the insects, may 
be considered as affording the chief specific characters. The 
thorax may be employed for the purpose of dividing the species 
into two sections; viz. those in which it is more distinctly bi- 
partite with the margins produced into an angular spine on 
each side in front, and those with the thorax almost continuous, 
the anterior part being only separated from the posterior by a 
slight impression, with the lateral margins rounded in front. 
The P. spherocerus appears to unite the two sections. 
Sectio 
