MANN: THE ANTS OF BRAZIL. 423 
near apex, then incrassate; funicular joints a little longer than broad. 
Eyes distinct, convex. Pronotum twice as long as broad, flat above, 
the lateral borders elevated into a rounded ridge, which is somewhat 
thickened at middle. Mesonotum separated from pronotum by a 
transverse ridge, elevated, concave at middle, strongly margined at 
sides; mesial to the margin is a longitudinal furrow and on the upper 
surface two parallel ridges. Base and declivity of epinotum subequal 
in length, the former flat above with margined sides; surface of the 
latter evenly convex. Petiole from above longer than broad; flat 
above, with straight, roundly margined sides. Postpetiole a little 
longer than broad, broadest behind, rounded above and at sides, 
anteroventral surface with a distinct tooth. 
Head, antennae, thorax, and epinotum sublucid; coarsely, granu- 
losely punctate, throughout, except for a rounded area mesial to the 
eye, which is finely punctate. Antennae, mandibles, petiole, post- 
petiole, and legs more shallowly punctate. Gaster smooth and shining. 
Head, body, antennae, and legs with long erect hairs; funiculus 
pubescent. 
Color black, antennae, and legs dark reddish brown.  Pilosity 
yellow. 
Described from several workers taken from a file that was running 
beneath the loose bark of a felled tree at Madeira-Mamoré Camp No. 
39. This is a very distinct form because of its peculiar sculpture and 
the strong carinae on the thorax. The latter, especialby those at the 
middle of the mesothorax, are interrupted so that in profile they ap- 
pear as tubercles. 
MyrMIcINAaE. 
63. Pseudomyrma arboris-sancti Emery. 
Plate 3, fig. 21. 
This species is widely distributed in northern South America, and 
many observations have been made on its relations to the trees of the 
genus Triplaris with which it appears to be always associated. The 
tree is well known to the Brazilians and Bolivians by the name of 
“palo santo,” and the ant is called the “taschi.’”’ I was told that no 
living tree was ever without the ants and that the ants never nested 
elsewhere than in this plant. At Madeira-Mamoré Camp 43 
Triplaris was fairly common in the woods and I examined some 
s 
