LIOMETOPDM. 289 



broad ; the thorax robust, the metanotura often compressed and 

 raised (Dolichoderus) or spinous (Anewetus); pedicel 1-jointed, the 

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

 inclined anteriorly, and often impinging on the front of the 

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

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

 genus (Aneuretus) exserted. 



Ke]/ to the Genera. 



A. Metanotum not bispinous. 



a, Clypeus wirh oval side-processes over- 

 lappinp the base of the mandibles on 



each side Liomktopum, p. 289. 



h, Clypeus without such side-processes. 

 a , Base of the abdomen not gibbous, not 

 overhanging the pedicel. 

 «2. Metanotum laterally compressed, 

 cuneiform, with a basal face more 

 or less horizontal, and an apical 

 face truncate, vertical, often cnn- 

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



latter by a sharp angle Douchodkuus, 



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. 



h'. Base of the abdomen gibbous, over- 

 hanging the pedicel. [p. 300. 



a-. Anal orifice ajiical Technomybmex, 



6". Anal orifice inferior, not apical. 

 d^. Pedicel with a s nail, low, but 



distinct node inclined obliquely [p. 305, 



forwards Bothkiomyrmex, 



b^. Pedicel without a distinct node . . Tapinoma, p. SOo. 

 B. Metanotum bispinous Aneuretus, p. 290. 



Genus LIOMETOPUM. 



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

 Hypoclinea, pt., Royer, IJerl. ent. Zait. iii (1859), p. 24J, J. 

 Liometopum, Mayr, Europ. Form. ISli], p. S<. 



Type, L. microcepJialum , Panz., from Europe. 



liari'ie. Bolh heuiisphertis. 



^ . Head with the mandibles triangular, broader posteriorly 

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

 10 teeth, the a])i(al tojth long acute and cur\ed ; clypeus some- 

 what flat, triangular, rounded posteriorly and extending to between 

 the antennal carina), laterally it; ex' ends in lit:le oval processes 

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

 verse ; antennal and clypeal hollo^\a coalescent ; frontal are i not 

 clearly detined ; antennal carin;o short, w ide apart, parallel, slightly 



VOL. II. U 



