LIOMETOPUM. 289 



broad ; the thorax robust, the metanotum often compressed and 

 raised (Dolufadtnu) orspinous (Aneuretus)- pedicel 1-jointed, the 

 node placed closer to the abdomen than to the thorax, sometimes 

 inclined anteriorly, and often impinging on the front of the 

 abdomen, which has a hollow anteriorly for its reception ; abdomen 

 generally gibbons in front ; sting not modified, but only in one 

 genus (Aneuretus) exserted. 



Key to the Genera. 

 A. Metanotum not bispinous. 

 a. Clypeus wit-h oval fide-processes over- 

 lapping the base of the mandibles on 



each side LIOMKTOPDM, p. 289. 



0. Llypeus without such side-processes. 

 a'. Base of the abdomen not gibbous, not 



overhanging the pedicel. 

 a 2 . Metanotum laterally compressed, 

 cuneiform, with a basal face more 

 or less horizontal, and an apical 

 face truncate, vertical, often con- 

 cave, the former passing into the [p. 291. 



latter by a sharp angle DOLICHODKRUS, 



fr. Metanotum not laterally compressed, 

 not cuneiform, rounded ; its basal 

 face passing into the obliquely 

 truncate sloping apical face by a 



more or less rounded curve. , IRIDOMYRMKX, p. 297. 



ft'. Base of the abdomen gibbous, over- 

 hanging the pedicel. [p. 300. 



a-. Anal orifice apical TECHNOMYRMEX, 



b 2 . Anal orifice inferior, not apical. 

 a 3 . Pedicel with a small, low, but 



distinct node inclined obliquely [p. 305. 



forwards BOTHRIOMYRMEX, 



6 3 . Pedicel without a distinct node . . TAPINOMA, p. 303. 

 B. Metanotum bispinous ANEURETUS, p. 290. 



Genus LIOMETOPUM. 



Formica, pt., Panzer, Faun. Ins. Germ, v (1798), p. 54, pi. 2, J . 

 Hypoclinea, pt., Jioyer, Bvrl. ent. Zelt. iii (I859J, p. 24J, rf. 

 Liumetopum, Mayr, Europ. Form. 1801, p. 83. 



Type, L. microcephalum, Panz., from Europe. 



liawje. Both hemispheres. 



. Mead with the mandibles triangular, broader posteriorly 

 than in front ; mandibles broad, the masticatory margin with 8 or 

 10 teeth, the apical tooth long acute and curved ; dypeus some- 

 what flat, triangular, rounded posteriorly and extending to between 

 the antennal carinae, laterally it ex'ends in little oval processes 

 over the basal portion of the mandibles, its anterior margin trans- 

 verse ; antennal and clypeal hollows coalescent ; frontal area not 

 clearly defined ; antennal cariua) short, wide apart, parallel, slightly 



VOL. II. TT 



