70 COLEOPTERA. 



Slices of its elytra. In the male the outer apical spines of 

 the anterior tibiae are both shorter and less stout, and the 

 inner spur is thin, and gradually and finely punctured, 

 ' instead of being broad, and truncate obliquely at its apex, as 

 in the male of confaminatus. The spur on the inner side of 

 the apex of the posterior tibiae in the male is, moreover, 

 shorter than in the same sex of contamijiatus. 



The depression in the metasternum of the male of the latter 

 species is also rather more defined, and has a very slender 

 mesial slightly elevated ridge, instead of a longitudinal furrow 

 as in the male of obliteratus. 



50. PsAMMODius PORCicoLLis, Illigcr, Magazin fiir In- 

 sectenkunde, ii. p. 195, 2 (1803), Aphodius ; G. R. 

 Waterhouse, Proc. Ent. Soc. Feb. 1, 1864; Zool. 

 8980 (1864). 

 Mr. Waterhouse has detected a specimen of the above 

 insect, mixed with J^. .sulcicoIUs, in Kirby's British Col- 

 lection, lately belonging to the Entomological Society ; and 

 has directed the attention of English Coleopterists to the 

 differences of the two species, with a view of obtaining further 

 evidence as to porcicollls being considered British. It has, 

 apparently, as yet only been taken in Southern Europe. 



P. porcicollis is decidedly larger than P. siilcicoUis, with 

 scarcely any traces of oblique ridges, and no large punctures, 

 at the back of the head. The thorax is more ample, with 

 the coarse punctures in the transverse sulci more numerous 

 and evident, especially behind ; the elytra are more strongly 

 sulcated, and have the punctuation larger ; the interstices of 

 the striae are broader, and the outer interstice is continued 

 ii'om the base of the elytron only about half-way towards the 

 apex, the two outer striae becoming confluent beyond that 

 point. The outer interstice in sulcicollis is united near the 



