478 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
and sharply truncate posterior border. Eyes small, slightly convex. 
Mandibles small, short, with four coarse teeth. Clypeus about as 
broad as long, carinate, the anterior border broadly concave. Frontal 
area distinct. Frontal carinae more approximate in front than behind. 
Antennae short and slender, the scapes curved, extending one eighth 
their length past the occipital corners; funicular joints 1-3 subequal, 
more than three times as long as broad, joints 4-6 subequal, slightly 
shorter than the first three, the rest of the joints still shorter and sub- 
equal in length. Pronotum one half as broad as the head, the anterior 
border and the front of sides with a rounded carina. Meso- and 
epinotum in profile evenly arched above; from above, rounded at 
sides. Petiolar node in profile about as thick as long, moderately con- 
vex in front, nearly straight behind; from above as broad as long, 
evenly rounded in front and behind. Legs very long, the tibiae and 
metatarsi broad and very much depressed. 
Sublucid throughout, the whole body finely shagreened, more 
coarsely on the head; with a covering of silky, recumbent pubescence, 
which is less abundant on the head, pro- and mesonotum, and the 
petiolar node; with long, stiff, erect hairs on the head, thorax, 
gaster, and legs; the head in addition bears shorter, suberect hairs. 
Body and legs black, the gaster on account of the dense, silky 
pubescence has a yellow sheen; head reddish brown, the antennal 
scapes black. Pubescence and short fine pile yellow; coarse hairs 
black. 
Worker minor (Plate 6, fig. 49, 51). Length 9 mm. 
Head a little longer than broad, narrowed in front, the sides nearly 
straight; occipital corners broadly rounded; posterior border straight. 
Clypeus with straight, projecting anterior border. Antennae long, 
the scapes extending three fourths their length past the occipital 
corners of the head. Thorax and petiole similar to that of worker 
major. Legs as in worker major. 
Sculpture, color, pile, and pubescence as in worker major, but the 
pubescence of the gaster is somewhat finer. 
Described from a small series which was collected at Madeira- 
Mamoré Camp 41. The ants were nesting in a hollow palm tree and 
it was necessary to smoke them out. Their movements in life were 
' very active. 
The peculiar shape of the thorax, the strongly flattened long legs 
and the color are very distinctive. 
