630 Mr. J. O. Westwood on the Paussidce, 



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 Yahr. ; 9-flavicornis'Fahr. 

 (without the expression of any doubt as to its belonging to this 

 genus) ; and 10. the Hispa bihamata of Linnaeus, 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.Jlavicornis 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 subsequentlj'" 

 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 antennae : 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 emploj^ed 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. spharocerus appears to unite the two sections. 



Sectio 



