112 THE ENTOMOLOGIST. 



Hydraena atricapillus. — Paykull did not describe this spe- 

 cies first, but adopted it from Fabricins; he, however, had only 

 Philhydriis testaceus in view ; hence Stephens's name should 

 be employed. 



Hydrobius globulus, Pk. — Fabricins described this irre- 

 cognizably as a Sphaeridium ; hence Paykull's name, though 

 later in date, should be retained. 



Berosus signalicollis. — Charpentier's name has four years' 

 priority over Curtis's, and is also accompanied by a figure. 



Limnebius picinus. — There is nothing salient in Marsham's 

 description, and the specimen in Stephens's collection (which 

 is a Marshamian type according to him) corresponds with 

 L. nitidus. In this doubt it seems better to adhere to the 

 ordinary usage, 



Cercyon raarinum, Th. — Thomson has divided Mulsant's 

 aquaticum into two species, C. marinum and C. palustre. I 

 inadvertently introduced the latter into my Catalogue, but it 

 has not to my knowledge been found here. C. aquaticum of 

 Stephens appears to correspond with C. anale. Hence Thom- 

 som's name should be retained. 



C. plagiatum, Er. — Marsham's description is inapplicable : 

 it more properly applied to a brightly- coloured haemor- 

 rhoidale. 



C. centromaculatum. Marsham's description corresponds 

 with a pale variety of pygmaeum. There is no allusion to 

 the central shade which is the great feature of this species. 



Megasternum boletophagum. — Marsham's description and 

 name certainly apply well to this species, and, whatever his 

 type may be, his diagnosis was never drawn up from C. rai- 

 nutum : hence I see no reason to substitute the less ex- 

 pressive name of C. obscurum ; but all these Cercyons were 

 brought into comparison by Marsham and Stephens, who 

 quite failed to catch the specific characters. 



(To be continued.) 



G. R. Crotch. 

 University Library, Cambridge. 



Description of the Larva of Acidalia coniiguaria. — Feeds 

 on Calluna vulgaris (common ling). Generally rests in a 



