THE HISTORY OI ; MYRMECOLOGY. 141 



uterus, Loplwinynnc.v, Diplomorium, Melissotarsus (Fig. 



I39)- 3 



Tribe 5. MVKMICAKII. 



Indo-African. With the characters of the single genus: 

 Myrmicaria (Fig. 74). 



Tribe 6. TETRAMORII. 



Cosmopolitan. Usually characterized by the lO-jointed antennae in 

 the male, with o/-i2-jointed antennae in the worker and female, in the 

 latter the frontal carinse are often moved a great distance towards the 

 sides of the head and form deep grooves for the antennae. 



Tctrainoriitni (with the subgen. Tetruinoriuni, Tctrogmus and 

 Xiphomyrmex ) , Eutetramorium, Triglyphothrix, Mayriella, 

 Calyptomyrmex, Meranoplus, Strongylognathus, Rhoptro- 

 inynnc.v, IVastnannia, Ochetomyrmex. 



Tribe 7. DACETONH. 



Cosmopolitan. Antennae of worker 5-i2-jointed, in the male 

 always i3-jointed. 



Daccton, Acanthognathus, Orectognathus, Strumigenys (Figs. 

 76 and 77), Epitritns (Fig. 75), Rhopalothrix, Ceratobasis. 



Tribe 8. ATTII. 



Neotropical. Antennae of worker and female ii-jointed, with a 

 tendency to form a i-jointed club; 13-jointed in the male. All the 

 known species cultivate fungi for food. 



A ptero stigma, Myrmicocrypta, Sericomyrmex, Cyphomyr- 

 uic.v, Atta (with the subgen. Atta, Acromyrmex, Mcellerius, 

 Trachymyrmex, Mycetosoritis and Mycocepurus). 



Tribe 9. CRVPTOCERII. 



Neotropical. Characterized mainly by the peculiar mushroom- 

 shaped gizzard. Frontal carinae in the worker and female prolonged 

 backward above the eyes to form deep scrobes for the antennas. Male 

 very different from the female. 



Procryptoccrns, Cryptocents (Figs. 53 and 78). 



1 This aberrant genus, known only from the peculiar dimorphic workers, has 

 been recently assigned to the Ponerinae by Emery. 



