376 MR. T. J. BOLD ON COLEOPTERA. 



genus the sexes differ in a like manner, the male always being 

 more glossy than his partner, even in the most obscurely coloured 

 species. This opacity of the female, which runs also through the 

 genus Agabus, and indeed extends over nearly the whole family 

 Hydradephaga, is caused by the surface being finely sculptured 

 (strigose, coriaceous, alutaceous, &c.) in that sex, and which is 

 either absent in the males or not so much developed. This dif- 

 ference of the sexes is but little noticed by even our best autho- 

 rities. I may add, that a pair of foreign types of discretus, kindly 

 lent me by Mr. Crotch, differed precisely as do our local examples 

 of nigrita, the male being glossy black with long hair, and the 

 female opaque, nearly hairless, and much less strongly punctured 

 than the other sex. 



Hy. elongatulus, Rev. 18. 



Mr. Rye, Ent. Annual, 1872, 138, informs us that this species 

 is " erroneously identified," but on what grounds he has formed 

 his opinion I am at a loss to know, as he has not seen the speci- 

 men on which it is founded, nor had any description of it. 



Hy. umbrosus ; Hy. incognitus, Rev. 18. 

 Both species from Wooler ; a series of the former, and two 

 examples of the latter. 



Agabus nitidus, Fab., = A. fontinalis, Rev. 20. 

 A fine male of this rare species was taken near Wooler in 

 May. 



Ocalea castanea, Erich., = 0. rufilabris, Rev. 22. 

 Has occurred in some plenty in the Wooler district. 



0. badia, Rev. 22. 



Several specimens from the same locality. 



Microglossa pulla ; M. nidicola, Rev. 22 (Haploglossa). 



Both species taken sparingly by beating willows on Wooler 

 Haugh, in May. 



Aleochara villosa, Rev. 114, E. C. Rye, Ent. Annual, 1872, 



49. 

 A second example of this new British species has occurred at 

 Long Benton. 



