MANN: THE ANTS OF BRAZIL. 483 
broadly rounded; occipital margin straight. Frontal carinae well 
elevated in front; frontal area convex. Clypeus rounded in front, 
longitudinally carinate at middle. Mandibles thick, the blade 
with five teeth. Eyes oval, convex, located at middle of sides of head. 
Scape of antennae extending nearly half its length beyond occipital 
corners, slightly bent, and thickened at apex; joints of funiculus 
subequal in length, each about twice as long as broad. Pronotum 
convex, one and one half times as broad as long, broadest in front; 
anterior border convex, posterior concave; sides in front broadly 
margined, the anterior corners laminate. Mesonotum obliquely 
flattened at sides, carinate at middle; the carinae, at junction of meso- 
and epinotum extended into a long projection which is bent backward 
and flattened at apex. At the base of the pronotum, on the sides is a 
small, but distinct tubercle. Epinotum carinate at middle; the sides 
very oblique. Slightly posterior to middle of epinotum is a second 
projection, longer than the first, and thicker at base; seen in profile 
this is bent backward; it is tuberculate on the front surface at a little 
less than half the distance to apex. The apex is deeply bifurcate for 
nearly one half the length of spine. From the base of this projection 
the epinotum is concave to base. Node of petiole, seen in profile, 
longer than high; seen from behind about as thick as high. The 
apex slightly margined, with three long, acuminate spines, one at 
apex, and others at middle of sides. Posterior surface of node flat- 
tened. Gaster elongate, sides slightly convex. Legs long, rather 
stout. 
Head, thorax, and epinotum subopaque, finely punctate. The 
punctures are very dense on the head and pronotum, giving these 
portions a velvety appearance. Head and pronotum with regular, 
recumbent pubescence, the head with a very few short, erect hairs. 
Antennae sparsely pubescent. Surface of posterior declivity of peti- 
olar node granular. Gaster densely, minutely punctate, with thin 
pubescence and sparse, short erect pile. Legs sparsely hairy. 
Head above fuscous; each occipital corner with a ferruginous 
blotch that extends in front of and beneath eye. Front of head, 
from a short distance beneath insertion of antennae yellow. Mandi- 
bles light ferruginous. Antennae fuscous, the scape at basal half 
ferruginous. The apical border of first gastric segment, the remaining 
segments of gaster and the apices of tibiae fuscous, rest of body and 
legs ferruginous. Pile and pubescence white. 
Porto Velho, Abund, and Camp 39 on the Madeira-Mamoré R. R. 
The specimens were found running about on leaves. 
