460 bulletin: museum of comparative zoology. 



tubercles at the posterior third. Epinotum elevated, in profile a little 

 longer than deep, triangular; apex armed with a pair of strong, slightly 

 curved spines; base and declivity subequal in length, the surface of 

 the former convex, of the latter flat. Petiolar node in profile one and 

 a fourth times thicker than long; from above twice as broad as long; 

 the posterior surface sloping. 



Sculpture similar to that of D. afellaboides, the head, pronotum, and 

 epinotum sublucid; petiolar node very coarsely and densely rugose; 

 mesothorax shining, less rugose; mesopleurae transversely striate. 



Gaster finely punctate and shining. Mandibles punctate. The 

 body, antennal scapes, and legs with rather abundant, erect, stiff 

 hairs. 



Color dark reddish brown to black, gaster black, legs lighter. Pile 

 of body and legs grey to white, of antennal scapes, black. 



Described from eleven workers taken at Manaos. They were feed- 

 ing on the exudation of a small shrub along a trail in the forest. 



This species is closely related to D. atellaboides, but differs in its 

 smaller size and more slender form, the longer neck and petiolar node 

 and the shining gaster. Dolichoderus rosenbergi Forel from Ecuador, 

 also has the gaster shining, but the first antennal joint in four times as 

 long as broad (in D. imbicellus it is less) and the size is larger (13 mm.). 



154. Dolichoderus {Dolichoderus) atellaboides (Fabricius). 



Several workers were collected at Abuna, and Madeira-Mamore 

 Camp 39. It is much less abundant than D. decollatus. 



155. Dolichoderus (Dolichoderus) imitator Emery. 



This is the smallest and most delicate species of the group, and the 

 least common. Five workers were taken at Madeira-Mamore Camp 

 39. 



The following key serves to separate the Brazilian species of the 

 subgenus Dolichoderus. 



Occiput not prolonged into a distinct neck 1. 



Occiput prolonged into a distinct neck 2. 



1. Large, coarse species, epinotal spines long, acuminate; node 



flattened above, unarmed decollatus Smith. 



Small, delicate species, finely sculptured, epinotal spines very 



