LOPHOMYBMEX. 195 



obsolete, the mesouotum slopes steeply down to a medial transverse 

 carina, behind which the short remaining portion of the meso- 

 notmn is level and very distinctly margined posteriorly ; meso- 

 metanotal suture broad, deeply impressed ; basal portion of 

 nietanotum broadening posteriorly and armed at the posterior 

 lateral angles with two long spines ; legs stout and long. Pedicel 

 comparatively long, the 1st node squamiform, rather thick and 

 transverse above, petiolate anteriorly ; 2nd node broader than the 

 1st, more or less rounded above ; abdomen oval. 



Besides the remarkable form of the thorax, the species of this 

 genus differ from Phidolc in the ^ not being dimorphous and 

 having only 11-jointed antenna). Three species are known from 

 within our limits. 



Key to the Species. 



a. Pronotum armed with two spines or teeth. 



a'. Nodes of the pedicel sculptured L. qtiadrispuwsus, p. 195. 



b'. Nodes of the pedicel smooth L. bnrmamis, p. 1915. 



t). Pronotum unarmed L. bedoti, p. 19G. 



iJ25. Lophomyrmex quadrispinosus, Jerdon (Ocodoma), Madr. Jour. 

 L. S. xvii (1851;, p. Ill, ^ ; Emery, Ann. Mus. Civ. Gen. xxxii 

 (1891^), p. 114. 



^ . Head and abdomen chestnut or reddish brown, thorax, legs 

 and pedicel brownish yellow. In some specimens the thorax 

 darkens to brownish and the head and abdomen are brownish 

 yellow; the mandibles, antennae and legs are always a shade 

 lighter than the thorax ; head smooth and shining, the thorax 

 anteriorly smooth and shining, very sparsely punctured and bearing 

 a few piligprous tubercles, posteriorly very linely rugulose, sub- 

 opaque. Pedicel : the nodes rugulose, opaque ; abdomen smooth 



Fig. ~t'l.—Lophomyrm".v quadrispinosus, ^. 



and shining ; pilosity sparse, yellowish in colour, slightly oblique 

 and most plentiful on the abdomen; the scape of the antennae, and 

 the tibiae and tarsi of the legs with a short, somewhat dense 

 pubescence. Head a little longer than broad, with a broad 

 posterior margin somewhat broader than in front ; mandibles striate 

 at base, slightly convex, the masticatory margin dentate ; dypeus 

 smooth and convex ; frontal area distinct, depressed, with a short 



o2 



