14 LAMELUCORN1A. lOnt/tUJ)lt(l<J1l8. 



dung ; I know of no locality further north than tho districts here men- 



tioned. 



O. tracticornis, Payk. Head and thorax dark bronze-green or 

 coppery, rather dull, elytra livid-testaceous with distinct irregular 

 black markings; head rather large with raised "margin, antennae brown 

 with blackish club ; thorax with base and sides rounded, the latter 

 slightly sinuate before anterior angles, which are rather prominent, 

 upper surface thickly and asperately punctured ; elytra with shallow and 

 obsoletely punctured striae, interstices flat, rather distinctly punctured, 

 almost in two rows ; legs black with tarsi more or less ferruginous ; 

 pygidium sparingly and obsoletely punctured ; posterior tibia3 with 

 apical setiu unequal. L. 48 mm. 



Male with the head rather longer and more sparingly punctured than 

 in female, with the vertex raised into a broad plate, which is feebly 

 dentate on each side, and terminates in a more or less curved horn, 

 thorax reflexed in front, simple in both sexes. 



Female with the head furnished with two transverse keels, smaller 

 and more thickly and strongly punctured than in male. 



In some males the plate and horn on vertex is much abbreviated, 

 and occasionally resolves itself into a carina, much as in female. 



In dung ; local, and commoner near the coast than inland ; not uncommon in the 

 London district ; Shirley, Wimbledon, &c. ; Whitstable; Deal; Dover; Hastings; 

 Bournemouth; New Forest; Isle of Wight ; Buruhain, Somerset; Bath; South Wales; 

 Barmouth ; Dean Forest; Bewdley Forest ; Huntingdonshire ; Cleethorpes, Lincoln- 

 shire ; Liverpool district ; not recorded from the extreme north of England or from 

 Scotland. 



O. nuchicornis, L. This species is closely allied to the preceding, 

 but may easily be recognized by the following characters : the head and 

 thorax are of a dull-black colour with very little metallic reflection ; the 

 thorax has the sides rounded without any sinuation before anterior 

 angles, and the elytra have the dark markings more or less distinctly 

 reticulate ; the pygidium also is more distinctly punctured, and the 

 apical setae of the posterior tibiae are equal ; the plate on vertex, which 

 terminates in a horn, is not quite so broad, and the anterior margin of 

 the thorax in the female is protuberant in the middle ; the average size 

 appears to be rather smaller, but this is a character that cannot be de- 

 pended upon, as the species belonging to the genus are extremely variable 

 in size. L. 5-8 mm. 



In dung; the most widely distributed of all our species; not uncommon in the 

 Midlands and the south, but very rare in the north and in Scotland ; London dis- 

 trict, not uncommon, Shirley, Chingford, Forest Row, Belvedere, Addington, 

 Greenwich, Gravesend ; Delamere Forest; Whitstable; Deal; Hastings; Qlanvilles 

 Wootton ; Isle of Wight ; Devon ; Burnham, Somerset ; Swansea ; Bui-mom h ; 

 Sutton Park, Birmingham ; Hunstanton ; Lincoln; Cleethorpes; Blackpool; South 

 Shields, very rare ; Scotland, very rare, Forth district, " Ayrshire, Mr. J. P. Duncan, 

 Murray's Cat." 



