1940] 
Rare Ponerine Genera 
83 
anterior clypeal margin in front view, with sinuate lateral 
margin which is obtusely angulate posteriorly and extends 
to a level with the anterior margin of the eyes ; between the 
lobes is a distinct circular impression somewhat divided by 
a continuation of a median carina; antennal scapes stout, 
distinctly exceeding occipital margin, terminal funicular 
joint longer than the three preceding joints taken together 
but shorter than the preceding four; mandibles finely and 
completely striate, with a long, acute apical tooth and a 
cutting edge bearing 3-7 irregular feeble denticles of which 
only the basal tooth is constantly developed. Thorax with 
a short, reflexed collar from which the pronotum rises as 
an even convexity to the plane thoracic dorsum when viewed 
laterally; inferior humeral angle in the form of an acute 
tooth; epinotal declivity rounded with a large spiracle on 
each side only feebly projecting. Petiole longer than high, 
with evenly convex dorsum and concave ventrum termi- 
nating anteriorly as a distinct, rounded tooth, from above 
squarish with feebly convex posterior margin and sides and 
as broad as long. First gastric segment from above ap- 
preciably broader than long, sides convex, anterior and 
posterior margins truncate, antero-ventrally produced as a 
large lobe ; second gastric segment longer than the first and 
much more massive; remaining segments capable of being 
entirely retracted except for a massive sting. Legs of 
moderate length and slender. 
Opaque, coarsely sculptured; head vermiculate with a 
tendency of the sculpturing to become reticulate on the 
occipital region and back of eyes; pronotum reticulate, 
thorax above longitudinally vermiculate, petiole and gaster 
reticulate — vermiculate, becoming feebler on the second 
gastric segment; legs finely punctate, tibise lucid, finely 
striate. 
Pilosity of moderately abundant, upright yellowish hairs. 
Color dull reddish-brown, appendages lighter and richer 
in color. 
Described from two dealate females which I took August 
20, 1935 back of the Forest Settlement, Mazaruni River, 
British Guiana. 
This species differs from A. simulans, bufonis and emeryi 
in having the occipital margin straight and not concave, 
