SIM A. 107 



b 3 . First node of pedicel not dentate 



posteriorly. 



*. Flagellum of antennae scarcely 

 thickened towards apex, with- 

 out distinct club. 

 5 . Calcaria of posterior pair 



of legs pectinate MYRMICA, p. 265. 



t>'\ Calcaria of posterior pair of 



legs not pectinate, simple. 

 a 6 . Clypeus bicarinate and 



b'identate HOLCOMYRMEX, p. 280. 



b. Clypeus not carinate or 



dentate. 

 n~. Metanotum unarmed or 



at most bidentate .... MESSOR, p. 277 ; 

 b~. Metanotum armed with [p. 269. 



2 short spines ... : .... APHJENOGASTER, 

 b 4 . Flagellum of antennae with 

 distinct club. 



a\ Clypeus bicarinate MONOMORIUM, p. 199. 



\ Clypeus not bicarinate, occa- 

 sionally with one carina. 

 ft 6 . Tibiae with simple calcaria. 

 a 7 . Neuters or workers 



strongly dimorphous . . PHIDOLE, p. 220. 

 ft 7 . Neuters or workers 



monomorphous. 

 a a . Maxillary palpi 4- 

 jointed ; erect hairs 

 on body not clavate ; 

 antennal furrow gene- [p. 175. 



rally present TETRAMORIUM, pt, 



b s . Maxillary palpi 5- 

 jointed ; erect hairs 

 'on body clavate ; 



no antennal furrows . . LEPTOTHORAX, p. 214. 

 6 6 . Tibiae without calcaria .... CARDIOCOXDYLA. 



[p. 287. 



Genus SIMA. 



Eciton, Jerdon (nee Latr.}, Madr. Jour. L. S. xvii (1851), p. 111. 

 Pseudomyrma, Smith (nee Lund), Cat. vi, 1858, p. 159. 

 Tetraponera, pt., Smith, A. M. N. H. (2) ix, 1852, p. 44. 

 Sima, Roger, Berl. ent. Zeit. vii (1863), p. 178, $ . 



Type, S. allaborans, Walker, from Ceylon. 



Range. Palaearctic, Ethiopian, and In do-Malay an regions. 



$ . Head more or less rectangular; in profile, truncate anteriorly, 

 the clypeus and mandibles being bent vertically downwards from 

 tbe line of the front; mandibles linear, very little if 'at all broader 

 at their apical margins than at their base ; clypeus narrow, not 

 produced back between the antennal carinae, generally with more 

 or less of a posterior median projecting portion ; sides above the 

 level of the eyes straight or convex, posterior occipital angles of 

 the head rounded ; antennae 12-jointed, short, somewhat massive, 

 with a distinct thickening towards the apex of the flagellum ; 



