MANN: THE ANTS OF BRAZIL. 461 
short; node in profile triangular, acuminate at apex, which is 
armed with two small teeth...........0...... imitator Emery. 
2. Color black, petiolar node in profile flat above, twice as*long as 
thick, epinotal spines rounded, slender.......... rugosus Smith. 
Color, in part, red. Petiolar node in profile less than twice as 
long as thick, not flat above; epinotal spines somewhat flat- 
tened and slightly rugose tow el BASCbe he 2 ae oaks ee 3. 
3. Node from above not twice as long as broad; gaster densely 
punctuimed aNd. OPAGUen.o.04 . eel. tatdke: dee atellaboides Fabr. 
Node from above more than twice as long as broad; gaster shin- 
[CASES © Rasy AE Al ee Me PES MUTE eee Meme pCR oe 4. 
4. First antennal joint 4 times as long as thick; length 13 mm. 
CRIGIAGNAD ooo Sei eae, eek i a2 alloted wade: rosenbergi Forel. 
First antennal joint less than 4 times longer than thick; length 
MIRNA et SRE Rte Ao ee ai elsnene aid sydd imbecillus Mann. 
156. Dolichoderus (Monacis) bispinosus (Olivier). 
Numerous colonies were found at Para, Itacoatiara, Porto Velho, 
and Madeira-Mamoré Camp 39. 
This is the commonest, and the most widely distributed species in 
the genus. It builds carton nests, sometimes of large size, in the 
branches of trees. The larger of these nests are solidly constructed, 
similar to certain termitaria. I am not certain that some which I 
examined were not termite nests that had been preémpted by the ants. 
When the formicary is disturbed the workers defend it very pugna- 
ciously. They bite hard enough to be disagreeable and the colonies 
are very populous. I have, on several occasions actually been driven 
from the near vicinity of a nest by this species. 
157... Dolichoderus (Monacis) spinicollis (Latreille). 
Workers of this singular species were encountered only once, at 
Madeira-Mamoré Camp 41. They were found shortly before twi- 
light, moving in a file along a slanting tree-trunk and going up 
into a tangled mass of vines. Each was carrying in its mandibles 
a portion of some fluffy, waxy substance. I could not locate the nest, 
and did not see any more of the ants, though I returned to the same 
locality several times for further search. 
This species is characterized by the very long, acute spines which 
