712 THE AMERICAN NATURALIST. [Vor. XXXVI. 
Mandibles inserted on the anterior corners of the head . a 
Mandibles inserted in the middle of the anterior border of the edi 55 
. Frontal carine approximated and almost perpendicular, not covering 
the insertions of the antenna. — deme constricted off 
from the following segment  . 23 
Frontal carinz more or less dilated, pie covering E insertions of the 
antennz at least in part; antennz always 12-jointed. . . . 26 
Petiole sharply margined laterally; last joint of antenna not particu- 
larly large (Asia, Australia, Africa). . . .. Phyracaces Emery 
Petiole not margined laterally 
24. Last antennal joint much longer ba de: ibam joint; otsdng a 
N 
— 
N 
N 
N 
W 
one-jointed club (Asia, Australia, Africa) . Cerapachys F. Smith 
The last two or three joints of the antenna form an indistinctly sepa- 
rated club (India) . . . Lioponera Mayr 
25. Frontal carine farther from tah dier du in the sides of the head. 
Mandibles with very long thorn-like teeth (South America) 
Thaumatomyrmex Mayr 
Frontal carine nearer to each other than to the sides of the head; 
mandibles of a different conformation . . 26 
26. Mandibles slender, when closed first strongly converging, pen directed 
straight forward, beak-like, below with a powerful tooth, eye very 
large, placed anteriorly (India) . . . . aint Jerdon 
Mandibles of a different conformation . 2 
27. Middle legs with two simple spurs; hind "- with: a seit nd a pets 
tinate spur (America, Africa, Asi ia) . . . Centromyrmex Mayr 
Spurs of the middle and hind = Of like structure . i. > 28 
28. Claws pectiniform . . . . Ve vici ei wu NT aM. N 
Claws not pectiniform 3° 
29. Mandibles slender with a fen lange ecth eng the medist bords 
(Australia) Prionogenys Emery 
Mandibles AGE d soto. or brosder with dentate edges (warm 
regions of the whole world) . . . . Leptogenys Roger 
. Antennal fovea continued back into a groove sowie bends around the 
eye and is capable of enclosing the antennal scape and a portion of 
the funiculus (South America) . . . . . Paraponera F. kgs 
Of a different conformation . 
31. Margin of clypeus denticulate ; MOSS on Leiter side vide. a idi 
like projection (India) . ; . . Odontoponera Mayr 
Clypeus not denticulate . 32 
Frontal carinz not boosdened into ions anieribify; bn sabe ‘slightly 
dilated, widely separated from each other ; middle and hind legs with 
well-developed median spur ; lateral spur, when present, very small 
F rontal carine converging posteriorly and there usually closely approx- 
imated. Anteriorly they are dilated to form a horizontal lobe . 39 
33- Antennæ with 3-jointed club ; claws simple . M 
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