Dinarda.'] staphylinidje. 53 



tubercles, the intervals being very finely shagreened ; elytra about as 

 long as tliorax with posterior angles produced in a spine, sculptured lik(3 

 thorax but not so finely ; hind body very strongly narrowed towards 

 apex, sparingly sculptured towards base, much smoother behind; legs 

 rather short and stout, ferruginous red. L. 3.^-4 mm. 



^ IMale wutli dorsal plate of seventh segment of hind body strongly 

 ciliate at apex, ventral plate produced. 



In iiosts of Formica rufa ; local, but not uncommon in some districts, and occa- 

 sionally occurs in numbcis. Plumstead, Chatham, Esher, Guildford; Hastings; 

 Bewdley Forest, Worcestershire ; Buddon Wood, Leicestershire ; Scarborough : it 

 appears not to be found further north. 



D. dentata, Grav. Smaller than the preceding, and distinguished 

 from it by the distinct longitudinal furrow on its head, and the less 

 thickened antennae ; the thorax and elytra are a little less closely sculp- 

 tured, and the former has the posterior angles a little more produced and 

 sharper ; the hind body is somewhat less narrowed behind, and is 

 clothed with a little less long and less close pubescence ; the general 

 colour, moreover, is brighter. L. 3 mm. 



In nests of Formica fusca and sanguinea; first foxmd at Plymouth by Mr. J. J. 

 Eeading; Weston-super-Mare (Crotch); Shirley, near Croydon "(Power, ; "Guildford ; 

 recorded from Exeter as taken with F. rufa, and also by Dr. Sliarp as occurring with 

 that ant very rarely in the Tay district, Scotland; Mulsant and Rey say That it 

 occurs equally with F. rufa and F. ciinicularia ; in Ent. Annual, 186i, p. "ll2, it is 

 mentioned as having been taken in plenty l>y Messrs. Scott and Douglas near Oi-oydou 

 in company with Formica sanguinea, but these specimens were afterwards said to be 

 small D. Maerkeli : the species are exceedingly closely allied, and have given rise to 

 a great deal of confusion in our collections. 



AT£MEI.i:S, Stephens. 



This genus contains about six European and tw^o or three iS^orth 

 American species ; they are found in company with ants ; in appearance 

 they closely resemble Lomechvsa, but they are in many points rather 

 widely distinct from that genus. Two species are British, one of which 

 is extremely rare ; they have the power of curling themselves up into a 

 sort of ball, and in this position are quickly carried off by the ants with 

 which they associate, when the nest is disturbed : when alive they bear 

 a much more striking resemblance to some of their hosts than might be 

 expected from an examination of dead specianens, and might easily be 

 passed over by an inexperienced observer. 



Thorax much narrowed in front ; posterior angles strongly 



^ projecting A. EJIARGINATTJS PayJc. 



Thorax hardly narrowed in front ; posterior angles mode- 

 rately projecting A. PARADOXUS, Grav. 



A. emarg-inatus, Grav. Oblong, broad, of a dull ferruginous red 

 colour, with tlie elytra and apex of hind body lighter, sometimes almost 

 orange-coloured, and the head, a portion of hind body before apex, and 



