
718 THE AMERICAN NATURALIST. [VoL. XXXVI. 
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No 
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Petiole pedunculate in front ; dimorphism of the workers very marked 
Acanthomyrmex Emery 
Petiole not EPEE in front; no — ine in the 
workers . Myrmecina Curtis 
. Antenne 7-10- jointed, jh ask dide: very eem tiaras without spines 
or teeth; eyes present. . . Allomerus Mayr 
Antenna 10-12-jointed; when dee are SPD ahi eyes are wanting or 
the epinotum is armed with two spines. . . . . = à v 4o 
. Without eyes i doque un raa EN 
With eyes, sometimes aoa SER quiis distinct ; iw 
. Antennz 12-jointed, without distinct club ; insects very sm 
all 
* Leptanilla Emery 
Antenne 1o-11-jointed, with 3-jointed club 42 
. Postpetiole armed with a spine on its lower kitice oe Mayr 
Postpetiole unarmed ; size very small Monomorium decamerum Emery 
. Antenne 11-jointed 
Antennz 12-jointed rsen in Pheidole Wirsuiilla dade: 
Thorax and petiole without any trace of teeth or spines; pronotum 
never angular 45 
Metanotum ndy sleays LS d with edi or spines; aiia they are 
absent, the pronotum has angular humeri . 48 
. Clypeus bidentate in front 0 cia oen 46 
Clypeus unarmed . E E M E 
Petiole distinctly pedunculate i in irott . . .  * Monomorium Mayr 
Petiole not pedunculate . . . Xenomyrmex data 
. Thorax unarmed, impressed in de, region rdàt the mesoépinotal su 
Vollenhovia Mayr 
Thorax sima with spines and without an impression at the meso 
epinotal su ; Stereomyrmex Emery 
. Eyes Mig bin Beaart wai Forwards 
Se André 
Eyes round or oval 49 
. Thoracic dorsum jetioundiy lide at the inso suture 59 
2 
Thoracic dorsum little or not at all impressed . 
. Homen of pronotum rounded. . =. . . . . . - Huberia Forel 
5! 
Humeri of pronotum angular . 
. Antennal club 3-jointed, at bat | as Jar as ‘Be iiaii of the 
L 
funiculus yrmex Emery 
Club indistinct, ie last (Ei ‘Sines wack ral than the remainder 
of the funiculus . Podomyrma F. Smith 
. Frontal carinz as TAE as ste idein scape . * Tomognathus Mayr 
53 
Frontal carinze much shorter than the sca 
Workers strongly dimorphic; integument shining, petk pedunculate 
achomyrm orel 
1 This group was established by Professor Forel as a subgenus of Liomyrmex: 
it has seemed to me to deserve elevation to the rank of a genus. 

