MANN: THE ANTS OF BRAZIL. 471 



175. Aztcca velox Forel var. 



Colonies were found at Manaos, Abuna, Porto Velho, and Madeira- 

 Mamore R. R. Camps 39 and 41. There is considerable variation in 

 the amount of infuscation on the vertex. 



176. Azteca angusiiceps Emery. 



A single dealated female from Itacoatiara agrees closely with 

 Emery's figure and description of this species. 



177. Azteca alfaroi 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 Abuna. 



179. Azteca trigona Emery subsp. mathildae Forel. 



This was the most abundant Azteca on the Rio Madeira. Speci- 

 mens were taken at Abuna, Porto Velho, and Madeira-Mamore 

 R. R. Camp 43. 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 Ceara-Mirim. Other colonies of a variety 

 identical with this were found at Abuna 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 Abuna and Madeira-Mamore 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. 



