66 COLEOPTERA. 



Apparently nearly allied to Euryvsa castanoptera, Kraatz, 

 which I know by description only, and from which it differs 

 in having the thorax wider than the elytra, the peculiar 

 sculpture of those parts, and the serrated posterior margin of 

 the seventh abdominal segment of the male. I have not 

 dissected the mouth. 



A pair only of this interesting creature have hitherto come 

 under my notice ; they were taken within the London district, 

 during the past summer, by Mr. H. Squire, in a nest of For- 

 mica fuliginosa . 



11. Aleochara mycetophaga, Kraatz ; Waterhouse, 



Zool. 5633 (1857). 



12. Dinarda dentata, Grav. ; Kraatz, Naturgesch. d. Ins. 



Deutschl. ii. 111,2(1856). 



Lomechusa dentata, Grav. Mon. Col. Micr. 181, 4 (1806), 

 but not of Curtis, Brit. Ent. ix. Fab. and Fo. 410 (1832), 

 cited by Dr. Kraatz, which, having carefully examined the 

 specimen in the national collection, figured by Mr. Curtis, I 

 have already, Proc. Ent. Soc. 1st Sept. 1856, Zool. 5305 

 (1856), shown must be referred to the nearly allied species 

 D. Maerkelii, Kiesenw., Kraatz. 



The present insect may be distinguished from D. Maerkelii 

 by its uniformly smaller size, its deeply longitudinally 

 furrowed head, slenderer antennas, more accute posterior 

 angles of its thorax, brighter hue, and by its more thickly 

 punctate thorax, elytra and abdomen. 



This beautiful and interesting addition to our list of indi- 

 genous Coleoptera was discovered by Mr. J. J. Reading, in 

 the spring of the present year, in company with Formica 

 fusca, in the vicinity of Plymouth, and to that gentleman's 

 liberality I am indebted for the species. 



In Germany, it is said to be found with Formica rufa, 

 but Dr. Kraatz distinctly states that it occurs with a species 



