106 



FOEMICID^. 



b'. Abdomen viewed in profile more or 

 less convex above, not triangular 

 beneath. 

 a' 2 . Metanotum unarmed. 



a\ Without eyes or ocelli, blind . . 



b 3 . Eyes present 



ft 2 . Metanotum armed. 



a 3 . Lateral margins of head and 



thorax denticulate and spiny . . 



ft 3 . Lateral margins of head and 



thorax not dentate or spiny. 

 4 . Pedicel attached to dorsal sur- 

 face of abdomen 



ft 4 . Pedicel attached to middle of 

 front or to ventral surface of 

 abdomen. 

 rt 5 . Pronotum armed with spines 



or teeth. 



G . Thorax raised anteriorly, 

 viewed from front with 

 a sharp truncate trans- 

 verse margin above .... 

 ft . Thorax not raised, de- 

 pressed, somewhat flat. . 

 ft 3 . Pronotum not armed. 

 rt 6 . Club of antennas formed 

 of apical 2 joints of 



flagellum 



6 B . Club of antennae formed 

 of apical 3 joints of 

 flagellum. 



ft 7 . Antennal furrows pre- 

 sent 



ft 7 . No antennal furrows. 

 s . Clypeus bicarinate. . 

 b*. Clypeus not carinate . 

 ft. Antennae 10-jointed .* 



c. Antenna} 9-jointed. 



a'. Antennal furrow lateral and deep . . 

 ft'. No antennal furrows. 



a 2 . Clypeus bicarinate 



i 2 . Clypeus not carinate , 



d. Antennae 7-jointed. . ., 



e. Antennae 6-jointed 



LIOMYRMEX, p. 198. 



VOLLKNHOVIA, p. 213. 



CATAULACUS, p. 120. 



CREMASTOGASTER,P. 124. 



LOPHOMYRMEX, p. 194. 



PRISTOMYRMEX, p. 193 

 PHIDOLOGITON, p. 160. 



[p. 175. 

 TETRAMORIU.M, pt., 



MYRMECINA, p. 197. 

 STEREOMYRMEX, p. 218. 

 SOLENOPSIS, p. 157. 



MERANOPLTJS, p. 166. 



OLIGOMYRMEX, p. 152. 

 CAREBARA, p. 150. 

 MYRMICARIA, p. 117. 

 STRUMIGENYS, p. 147. 



B. Antennae 12-jointed. 



a. Posterior margin of clypeus not produced 



between bases of antennae 



ft. Posterior margin of clypeus produced 



between bases of antennae. 

 a'. Pronotum armed with 2 spines .... 

 ft'. Pronotum not armed. 



2 . Erect hairs on body trifid 



ft 2 . Erect hairs on body not trifid; 



simple. 

 a 3 . First node of pedicel bidentate 



posteriorly ATOPOMYRMEX, p. 189. 



SIMA, p. 107. 



[p. 191. 



ACAXTHOMYRMEX, 



TRIGLYPHOTHRIX, p. 171. 



