172 ADEPHAGA. {^DevonecJes. 



mediate tarsi dilated, and the intermediate tibiaj curved. Long. 5^, 

 lat. 2 1 mm. 



Kunning' water ; not uncommon and widely clistributerl throughout England and 

 Wales, although somewhat local in certain districts ; Scotland, common as far north 

 as the Moray district ; Ireland, Waterford, Armagh, &c. 



D. griseo-striatus, De G. Oval, rather narrow, somewhat dull, 

 plainly but closely pubescent ; head testaceous with two dark patches 

 near eyes reaching hind margins ; thorax testaceous with dark markings 

 usually separated by a fine testaceous longitudinal line in centre, centre 

 of disc with a minute fovea ; elytra long, forming with thorax an unin- 

 terrupted outline, testaceous, with about seven lines on each black, which 

 are usually distinct, although in places confluent ; the pubescence gives 

 the whole insect a greyish appearance ; the upper surface is very closely 

 and finely reticulate ; underside black. The sexes are hardly distinguish- 

 able externally. Long. 4|, lat. 2\ mm. 



Lakes in the Highlands of Scotland. Local, Forth, Dee, Argyle, and Moray 

 districts ; also in Shetland ; said to have occurred in the north of England. 



This species comes near H. halensis, and used to do duty for it in 

 collections, until Dr. Schaum pointed out its differences : it may at once 

 be separated from that species by its longer form, more continuous 

 outline, finer margins of thorax, and usually darker colour, 



XSVBROPORUS, Clairville. 



The genus Hydroporus proper contains about 150 species, which are 

 found almost exclusively in Europe and the circum-Mediterranean 

 region. Northern Asia, and North America ; only three or four species 

 come from the southern hemisphere, one of which is from Chili, a fact 

 worth noticing in comiection with what has been said before {ante, 

 p. 140) : the species are all small, and, as a rule, inconspicuous, and are 

 in many instances very hard to determine ; in fact " the black Hydro- 

 pori " are always one of the greatest difficulties of collectors. Dr. 

 Sharp divides the whole genus into two divisions, and nine groups ; but, 

 besides the fact that the difi'erence between the divisions is grounded on a 

 very obscure character (although a constant and good one), the practical 

 usefulness of the arrangement to British Coleopterists is very small, as 

 one of the nine groups contains twenty-two of our thirty-six or thirty- 

 seven species, and another contains nine, so that only five or six are left 

 in the others. 



I have spent a very long time in the endeavour to make even an 

 artificial arrangement that might be serviceable, but none appears to be 

 satisfactory, and I had intended to leave out. a table altogether ; the one 

 given below will, however, be found of use to any students who will 

 make themselves acquainted with the general differences and appearance 

 of the various sections beforehand ; I am indebted for it m great measure 

 to M. Bedel : its chief fault is that the character on which one of its 

 chief divisions depends is not always very obvious, viz. the angle made 

 by the lateral border of the elytra and thorax viewed sideways, although 



