24 



b 3 . Claws not pectinate. [p. 72. 



4 . Pronotum with teeth or spines .... ODONTOPONEHA, 



b 4 . Pronotum without teeth or spines. 



"'. Posterior margin of clypeus not dis- [p. 73. 



tinctly defined ................ PLATYTHYREA, 



a". Posterior margin of clypeus defined 



by a suture. 

 a". Node of pedicel bispinous pos- 



teriorly ...................... DlACAMMA, p. 75. 



b. Node of pedicel not bispinous, some- 



times denticulate posteriorly. 

 a 1 . Posterior coxae armed with a 



spine ...................... ECTATOMMA, p. 82. 



b~. Posterior coxae unarmed. 

 8 . Episternum of mesothorax sepa- [p. 85. 



rated from sternum by a suture. ECTOMOMYRMEX, 

 b*. Episternum of mesothorax not 



separated from sternum. 

 . Posterior tibife with only one 



spur. 

 rt 10 . Club of flagellum of antennas 



not well denned .......... PONERA, p. 88. 



b 10 . Club of flagellum of antennae 



distinct. 



a 11 . Mandibles armed with five [p. 104. 



teeth .................. CRYPTOPONE, 



b 11 . Mandibles armed with two 



teeth .................. MYOPIAS, p. 103. 



b 9 . Posterior tibiae with two spurs. 

 10 . Middle of front margin of 



clypeus produced, truncate [p. 91. 



at apex ................ PSEUDOPONERA, 



b 10 . Middle of front margin of 



clypeus not produced. [p. 93. 



fl u . Without eyes, blind ...... CENTROMYRHEX, 



6 11 . Eyes present. 



ia . Meso-metanotal suture ob- [p. 95. 



solete ................ BOTHROPONERA, 



b 12 . Meso - metanotal suture 



well marked. 

 a 13 . Masticatory margin of 



mandibles very long, [p. 99. 



longer than inner margin. MESOPONERA, 

 A 13 . Masticatory margin of 



mandibles shorter, about [p. 101 . 



length of inner margin. . BRACHYPONERA, 



Genus SPHINCTOMYRMEX. 



Sphinctomyrmex, Mayr, Verh. zool.-bot. Ges. Wien, xvi (1866), 

 p. 895, pi. 20, fig. 8. 



Type, S. st&li, Mayr, from Brazil. 

 Range. Neotropical and Indo-Malayaii regions. 

 % . Of elongate slender form ; head rectangular, slightly 



