184 .ADErHAGA. [Hijilnqiorns. 



which arc very evident in this species, are hardly traceal)]e in //. mela- 

 narius; in form and colour it somewhat resemhles H. morio, S , hut is 

 more parallel, less distinctly punctured, and has the thorax more dis- 

 tinctly margined ; the angle, too, formed hy the sides of elytra^ and 

 thorax viewed sideways is more obtuse than in that species (Dr. Sharp 

 says it is about the same, and it may certainly be regarded as one of the 

 transitional species, but on a comparison of Dr. Sharp's own types the 

 angle formed by the sides appears distinctly more obtuse than in average 

 specimens of H. morio). 



H. melanarius, Sturm (i\ montirola, Sharp). Oblong oval, 

 almost without pubescence, black or pitchy, antennae and legs red; 

 thorax punctured on margins, disc smooth or almost smooth; elvtra 

 parallel-sided rather strongly and diffusely punctured, punctures obsolete 

 towards apex which is usually of a lighter colour ; this is a somewhat 

 variable species in size, sculpture, and even in form ; some examples are 

 dull and less distinctly but not more closely punctured than others, 

 Avhich are shining and very distinctly punctured ; H. mojiticqla, Sharj), 

 was described from these smaller, duller, and more finely punctured 

 specimens. Long. 3-3|; lat. 1|— If mm- 



Ditches and mossy holes amongst Sphagnum, rare. London district, Esher and 

 Lee Pit (Power), Woking (Champi^on) ; as a rule these specimens from near London 

 are larger than the more northern forms ; on Cannock Chase 1 took a specimen in 

 1879 intermediate between the type and the variety ; Askham Bog ; Northumberland 

 district, uiossv holes on moors, rare; Scotland, rare, Highlands, Tay, Moray, Sol- 

 ^vav. Dr. Sharp's original specimen of R. monticola came from Glen Affrick, 

 Inverness-shire. 



The differences between this species and the preceding are mentioned 

 above : from H. morio, $ , it may at once be distinguislied by its more 

 pitchy colour, red legs and antennae, impunctate disc of thorax, and 

 shorter and mere parallel-sided elytra. 



H. memnonius, Nic. Oblong oval, rather depressed, almost with- 

 out pubescence, pitchy, or pitchy black with the anterior and posterior 

 margins of head and sides of thorax more or less distinctly ferruginous ; 

 antennfc and legs red, the former somewhat elongate ; thorax with sides 

 only slightly narrowed in front, with the margins strongly and the disc 

 finely punctured ; elytra rather closely and strongly punctured ; abdomen 

 and breast black; male shining and plainly puncttu-ed, female dimorphic, 

 one form being like male, and the other very dull and finely punctured, 

 and usually entirely of a castaneous colour : this form is the //. castancm, 

 Aube. Long. 4, lat. 2| mm. 



Ponds, ditches, &c., either in woods or open spaces ; rather local, but widely 

 distributed throughout the country ; also rather common in Scotland in lowland 

 districts as far north as Morayshire. 



H. obscurus, Sturm. Oval, rather convex, scantily pubescent, 

 rather shiny, red or fuscous red with the head, base of antennaj (which 

 are short), and legs lighter; thorax with the disc broadly smooth. 



