272 CLAVICGUNIA. '[Monotoma. 



interstices furnished with rows of short set*; pygidium exposed ; legs 

 lather short, ferruginous. L. 2-2 1 nun. 



Male with the thorax more narrowed in front and the anterior angles 

 more strongly produced, and with all the tibiae curved and produced into 

 a spine at apex. 



In nests of Formica rvfa ; local, but not uncommon where it occurs ; Esher ; 

 Plumstead; Chatham; Tilgate Forest; Hustings; Parkhurst Forest, Isle of Wight; 

 Glanvilles Wootton ; Devon ; Bewdley Forest ; Buddon Wood, Leicestershire ; York ; 

 Scarborough ; not recorded from the extreme northern counties of England ; Scot- 

 land, rare, Dee and Moray districts. 



XK. formicetorum, Thoms. (angustieollis, auct. ; Gyrocecis formi- 

 cetorum, Thorns.). Very like the preceding, but at once distinguished 

 by its shorter thorax which is much less narrowed in front, and by its 

 shorter and proportionally broader head and larger and more prominent 

 eyes ; the elytra also are broader, especially at apex ; the tibiae are not 

 curved, and do not terminate in a spine in the male. L. 2-2 1 mm. 



In nests of Formica rufa, and sometimes in company with the preceding ; it is, 

 however, more local and less common ; Hampstead' ; Esher ; Plumstead ; Chatham ; 

 Tilgate Forest ; Hastings ; Parkhurst Forest, Isle of Wight ; Buddoti Wood, Leices- 

 tershire; York; it does not occur, apparently, in the extreme northern counties of 

 England, or in Scotland. 



As the name angusticollis, Gyll., has been applied by different authors 

 to both species, and Gyllenhal's description (Ins. Siiec. iv., p. 634) will 

 fit either insect, it seems best for convenience sake to drop it altogether ; 

 in all probability Gyllenhal described the two species as one ; the M. 

 angusticollis, Gyll., of Sharp's catalogue must be referred to M. conici- 

 cohis, but the M. angusticollis, Gyll., of the catalogue of Heyden, Eeitter, 

 .and Weise, is Thomson's M. formicetorum. 



TIL. spinicollis, Aube (spinigera, Chaud.). Pitchy-black, elytra 

 usually somewhat lighter, with reddish shoulders ; head large, tri- 

 angular, rather strongly narrowed before eyes which are prominent; an- 

 tennae moderately long, ferruginous ; thorax not much longer than 

 broad, with sides rounded and somewhat dilated behind and evidently 

 narrowed in front, anterior angles sharply produced, strongly sculptured, 

 the sculpture being composed of large round variolose impressions with 

 more or less raised intervals, disc -with two depressions towards base ; 

 elytra short and broad, somewhat ovate, rather shining, with very coarse 

 but rather shallow rugose sculpture ; legs ferruginous. L. 2 mm. 



Male with the anterior tibiie rather strongly curved and feebly emar- 

 ginate towards apex, terminating in a short and not very evident spine. 



In cut grass, hot-beds, haystack refuse, &c. ; not common ; Ealing, Wimbledon, 

 Forest Hill, Darenth Wood, Chatham, Cowley, Maiilstone, Croydon, Peckhnm, 

 Shirley, Bishops Wood ; Kingsgate ; Glanvilles Wootton ; Edgbaston ; Kuowle ; 

 Jlepton, near Burtou-on-Trent. 



