MANN: THE ANTS OF BRAZIL. 471 
175. Azteca velox Forel var. 
Colonies were found at Manaos, Abun4, Porto Velho, and Madeira- 
Mamoré R. R. Camps 39 and 41. There is considerable variation in 
the amount of infuscation on the vertex. 
176. Azteca angusticeps Emery. 
A single dealated female from Itacoatiara agrees closely with 
Emery’s figure and description of this species. 
177. Azteca alfarot Emery var. 
Several workers of a variety of this species were taken at Abuna. 
These are very close to var. A. aequilata Forel, but the sides of the 
head are more convex. 
178. Azteca trigona Emery. 
Numerous workers were taken at Manaos and on the Rio Madeira 
at Camps 35, 39, 41, 43, Porto Velho, and Abunda. 
179. Azteca trigona Emery subsp. mathildae Forel. 
This was the most abundant Azteca on the Rio Madeira. Speci- 
mens were taken at Abunda, Porto Velho, and Madeira-Mamoré 
R. R. Camp 438. At Itacoatiara many colonies were nesting in high, 
buttressed trees near the river bank. 
180. Azteca trigona Emery subsp. mathildae Forel var. spuria Forel. 
A number of colonies, in small carton nests, six or eight inches in 
length, were found at Ceard-Mirim. Other colonies of a variety 
identical with this were found at Abund on the Rio Madeira. The 
latter attend Coccidae of several species, over which they build sheds. 
The coccids which I observed were on small bushes near the trees on 
which the formicaries were built. The ants energetically defended 
the sheds and the Coccidae. 
181. Azteca barbifex Forel. 
Very abundant at Abuné and Madeira-Mamoré Camps 28, 39 and 
41. The type specimens are from the Rio Purus and the species is 
probably widely distributed throughout the upper Amazonian region. 
