MANN: THE ANTS OF BRAZIL. 461 



short; node in profile triangular, acuminate at apex, which is 

 armed with two small teeth imitator Emery. 



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 toward base 3. 



Node from above not twice as long as broad; gaster densely 

 punctured and opaque atellahoides Fabr. 



Node from above more than twice as long as broad; gaster shin- 

 ing 4. 



First antennal joint 4 times as long as thick; length 13 mm. 

 (Ecuador) roscnhcrgi Forel. 



First antennal joint less than 4 times longer than thick; length 

 10 mm ivibecilhis Mann.' 



156. Dolichoderus (Monads) hispinosus (Olivier). 



Numerous colonies were found at Para, Itacoatiara, Porto Velh(^ 

 and Madeira-Mamore 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 termiiaria. I am not certain that some which 1 

 examined were not termite nests that had been preempted by the ants. 

 AYhen 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 (Monads) spinicollis (Latreille). 



^Yo^kers of this singular species were encountered only once, at 

 Madeira-Mamore 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 



