216 THE CANADIAN ENTOMOLOGIST. 



ee. Thorax pale at sides, basal line distinct. Elytra pale 

 with transverse piceous post-median band 



(.05.-08 in.) nigriceps, Marsh. 



Sph^ridium, Fabr. 

 S. scar abceo ides, Linn., has twice been reported from 

 Canada, once in considerable numbers. It is a shining 

 black insect about .25 in. long, the elytra with a reddish 

 basal spot and a much larger terminal one. The colour 

 varies a great deal in European specimens, but the species 

 can easily be separated from any American Sphseridiini by 

 its large size. The figure (fig. 16) is made from an English FigTi6. 



specimen. 



Megasternum, Muls. 



M. posticatwn. Mann., has been (perhaps erroneously) recorded 

 here. It is about .08 in. long, convex, blackish, subopaque, elytra paler 

 at tip, the sides of the thorax and a humeral spot less distinctly so. 

 Elytra finely striate, striae punctured indistinctly at middle, plainly at 

 sides and apex. Legs rufopiceous. 



Cryptopleurum, Muls. 

 C. mimitum, Fabr. {vagans, Lee.), represents the genus in Canada 

 and may be known by the generic character given in the table in addition 

 to its small size — .08 in. — rather deeply striate elytra, which are pale at 

 apex and often also at sides, and the sparse pubescence, which is, 

 however, often rubbed off in old or poorly-preserved specimens. 



The principal works available for the study of the North American 

 HydrophilidK are: — 

 l^SS- Leconte, J. L., Synopsis of the Hydrophilidas of the United States. 



Proc. Acad. Nat. Sci. Phil., VII., pp. 356-375. 

 '1823. Horn, Geo. H., Revision of the genera and species of the tribe 



\^ 'L Hydrobiini. Proc. Am. Phil. Soc, XIII., pp. 1 18-137. 

 i876.-'->'Horn, Geo. H., Synoptic tables of some genera of Coleoptera, 

 -^i£v ,/with notes and synonymy. Tr. Am. Ent. Soc, V., pp. 246-252. 

 j,§ji^^,Jyeconte, J. L., and Schwarz, A. E., The Coleoptera of Florida. 



Proc. Am. Phil. Soc, XVII., pp. 353-472 {Cyclonotum and 



Ochthebius). 

 f^^ 'H^6t¥iV'Geo. H., Notes on the species of Ochthebius of Boreal 

 .auo'j:)i<[ America. Trans. Am. Ent. Soc, XVII., pp. 17-26. 

 1890. Horn, Geo. H., Notes on some Hydrobiini of Boreal America, 1. 

 .nniJ ,-a<5,i,\l>p,,,3,3,7-2 78. 

 i^9o.H(Hornj,Gep^j,H., A revision of the Spheeridiini inhabiting Boreal 



.111 .lUs^l^fi^^''^- ^^ PP- 279-314- 



