24 ENTOMOLOGICAL SOCIETY 



Tribe I. ECITONINI. 



This tribe seems to be confined to the New World North, 

 Central, and South America, and the West Indies. 



TABLE OF GENERA. 



1. Workers ..................................................... 2 



Females ........................................................ 3 



Males .......................................................... 4 



2. Antennae 12-jointed; workers more or less dimorphic, the soldiers 



with long, hook-like mandibles, the workers with triangular 

 mandibles; metathorax bicarinate; maxillary palpi 2-jointed, 

 labial palpi 3-jointed. 

 Claws with a tooth beneath ...................... Eciton Latreille 



(Type, Formica hamata Latreille) 

 Claws without a tooth beneath, simple .......... Acamatus Emery 



(Type, Eciton schmitti Emery) 



3. Wingless; meso- and meta-notum divided, together scarcely longer 



than wide; abdominal petiole transverse, above triangularly con- 



cavely emarginate posteriorly. 

 Claws with a tooth beneath ...................... Eciton Latreille 



Claws without a tooth beneath, simple ........... Acamatus Emery 



4. Front wings with three cubital cells. 



Abdominal petiole above subconvex or at least never deeply con 

 cave; mandibles narrow, falciform, acute at apex ............ 5 



Abdominal petiole above deeply concave; mandibles broadened, 

 not falciform ............................................... 6 



5. Subdiscoidal cell not interstitial with the apex of the submedian vein. 



Claws with a tooth beneath ...................... Eciton Latreille 



Claws without a tooth beneath, simple .......... Acamatus Emery 



6. Subdiscoidal nervure interstitial with the apex of the submedian 



vein; claws with a small tooth beneath. .Mayromyrmex Ashmead 



(Type, Labidus fargeaui Shuckard) 



Tribe II. 



This tribe is apparently confined principally to the Asiatic 

 fauna, a few only occurring in Africa. 



TABLE OF GENERA. 



1. Workers ....................................................... 2 



Females ........... . ......................................... 5 



Males .......................................................... 6 



2. Antennas lo-jointed. 



Eyes wanting ................................................ 3 



Eyes present ...................... ........................... 4 



