40 
mandibles have a large tooth within near the middle; thorax narrowed 
posteriorly, with all the sutures, or at least the promesonotal suture, 
present; first abdominal segment well separated from the second by a 
ShrONne CONSERICHIONy ANG sa IN OV] Cy ORT typ ee aT 5 
Head oblong, sometimes longitudinally grooved, the eyes, when present, oval 
or oblong, placed on the sides near or a little beyond the middle, never 
far anteriorly; mandibles most frequently rather long and narrow, with 
teeth along the inner margin; if triangular, the masticatory margin is 
edentate; thorax rarely much narrowed posteriorly, the sutures some- 
times present, sometimes wholly absent; first abdominal segment not 
well separated from the second, usually broadly sessile with it, and 
WPuoCayoher fy nonxoysayoykes jorbo loxsriweyes me ee 4 
4, Head, thorax, and first two segments of the abdomen not longitudinally 
grooved, the sutures of the thorax distinct; mandibles rather long and 
narrow, acute at apex, and armed with teeth along the inner margin; 
eyes sometimes absent; if present, oval, placed at or near the middle of 
the*sidesiot the heady. 22 22 tc sae a eee Tribe II. AMBLYOPONINI 
Head, thorax, and first two segments of Abdomen longitudinally grooved, the 
sutures of the thorax entirely absent; mandibles obliquely truncate at 
apex, without teeth; eyes oblong, placed on the sides of the head a little 
behind the middle; scape of antenna short, not half the length of the 
heads’ Sk a ee ee Tribe III. CYLINDROMYRMICINI 
Thorax always narrowed posteriorly, with the pro-, meso-, and metanotal 
sutures usually present, or at least with the pro- and mesonotal sutures 
present, scape of antenna long, usually reaching to the apex of the head 
or nearly to it; scale of abdominal petiole usually higher than long; eyes 
placed on the sides of the head, usually between the middle and the base 
of the mandibles, rather close to the mandibles. 
Tribe IV. PACHYCONDYLINI 
6. Thorax rather long, narrowed posteriorly much as in the Pachycondylini 
and with usually one or more of the notal sutures present, the sides 
never parallel, usually more or less constricted medially, but never 
strongly constricted, mandibles never very long, and not curved upward, 
usually with a slight curve downward; head oval-quadrate or oblong, 
the eyes not large, placed on the sides, usually a little before the middle, 
rarely, behind the middles 2s) =s. =a Tribe V. EcraAToM MINI 
Thorax very long and cylindrical, the sides parallel, or nearly, the pronotal 
suture alone distinct, the meso- and metanotum closely united without 
a trace of a dividing suture; mandibles abnormal, very long, slender, and 
curved upward, the inner margin from the basal angle armed with two 
rows of minute teeth; head oblong, the eyes large and placed close to_ 
thesbase of wheimandibless= a= =a Tribe VI. DREPANOGNATHINI.@ 
ou 
aTribe I. Lioponerini: Represented by a single genus, Lioponera Mayr. 
Tribe II. Amblyoponini. Genera: I/yopone Roger, Mystrium Roger, Emeryella 
Forel, Stigmatomma Roger, Mesorena Smith, and Amblyopone Erichson. 
Tribe IIT. Cylindromyrmicini: A tribe found only in the Americas and rep- 
resented at present by two genera, Cylindromyrmesr Mayr, and Thaumatomyr- 
mex Mayr. 
Tribe IV. Pachyeondylini: This tribe is well represented in America, Asia, 
and Africa, probably a dozen genera being already characterized. Those known 
to me are: Odontoponera Mayr, Diacamma Mayr, Plectroctena Smith, Both- 
rioponera Mayr, Belonopelta Mayr, Pseudoponera Emery, Brachyponera Emery. 
