MANN: THE ANTS OF BRAZIL. 401 



State of Amazonas. 



liacoaiiara. On the north bank of the Amazon, about forty miles 

 below the mouth of the Rio Madeira. 



Porto Vclho. The starting point of the Madeira-Mamore Railroad, 

 near the border of Matto Grosso, about three miles from the Brazilian 

 village of Sao Antonio. 



State of Matto Grosso. 



Ahund. On the Brazilian side of the river, nearly opposite the 

 mouth of the Rio Abuna which forms the boundary of Bolivia and the 

 Brazilian State of Matto Grosso. 



Madeira-Mamore R. R. Camps. Collections were made at a number 

 of construction and other camps along the line of the railroad. The 

 numbers of the camps are given as data. The locality can be most 

 exactly expressed by giving the distances in kilometers from Porto 

 Velho. These are: 



My study of the collection of Formicidte has been made possible 

 through the aid of Prof. W. M. Wheeler who has constantly followed 

 the course of my work and generously permitted me to use his exten- 

 sive collections and library at all times. 



I wish to thank Dr. J. C. Branner, through whom I was enabled to 

 accompany the expedition, and Dr. Fred Baker, Dr. Harold Heath, 

 Prof. E. C. Starks and Messrs. Olaf Jenkins, Earl Leib and George 

 Branner, members of the Stanford Expedition, as well as Prof. Chas. 

 T. Brues of the Bussev Institution, all of whom have assisted me in 

 various ways. 



PONERINAE. 



1. Acanthostichits brevicornis Emery. 



Tliree workers taken from beneath a deeply imbedded stone at 

 Independencia, agree closely with Emery's description of A. brevi- 

 cornis from Cayenne. The length varies from 3 to 6 mm. The head 

 is considerably longer than broad, with straight, parallel sides. The 



