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. atellaboides, 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 Abundé, and Madeira-Mamoré 
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-Mamoré Camp 
39. 
The following key serves to separate the Brazilian species of the 
subgenus Dolichoderus. 
Occiput not prolonged into a distinct neck................<. a. 
Ocaput. prolonged into\.a’ distinct MeEks se" 7 Yss. Soe) Bae Be ps 
1. Large, coarse species, epinotal spines long, acuminate; node 
flattenediabove; unarmed 20) al lA ep ahe decollatus Smith. 
Small, delicate species, finely sculptured, epinotal spines very 
