66 COLEOPTERA. 



by its more oblong form, shining appearance, and the com- 

 parative coarseness of the oblique scratches on the elytra, 

 \vhich are, moreover, more transverse in C. dentipes. 



40. Helophorus dorsalis, Mulsant, Palp. 40, 6; G. R. 

 Crotch, Zool. 8610 (1863). 



Mr. Crotch says this insect may be readily distinguished 

 fiom H. granularis, by its superior size and crenate striaB, 

 and that M. Lapponicus, Thorns., must be very near it from 

 the description. A specimen given to me by Mr. Crotch 

 certainly differs from all our other recorded species. 



In that gentleman's Catalogue of Brit. Col. (Cambridge, 

 1863), this species is brought forward thus — " dorsalis, 

 Marsh. ? Muls." but Marsham's insect (about which there 

 can be no doubt I should think) is that afterwards referred 

 to by Mr. Crotch as quadrislgnatus, Bach., and is, more- 

 over, not found in brackish water as far as my experience 

 goes, but in ponds near London, being not uncommon at 

 Hammersmith marshes, Hampstead, and Wimbledon. 



H. dorsalh, Muls., was taken by Mr. Crotch in some 

 numbers at Liverpool. 



41. Helophorus ^neipennis, Thompson, Ofv. af Vet. Ac. 

 Forh. 1853, 43, 10, id. Skand. Col. ii. 81, 10 ; G. R. 

 Crotch, Zool. 8611 (1863). 

 granularis J var. b, Mulsant. 

 aquaticuSf Er. 

 Mr. Crotch says this insect is about the size of H. griseuSj 

 with the elytra sub-seneous and legs darker, and the inter- 

 stices of the striae clearly more convex. 



