MANN: THE ANTS OF BRAZIL. AGI 
State of Amazonas. 
Itacoatiara. On the north bank of the Amazon, about forty miles 
below the mouth of the Rio Madeira. 
Porto Velho. The starting point of the Madeira-Mamoré Railroad, 
near the border of Matto Grosso, about three miles from the Brazilian 
village of Sao Antonio. 
State of Matto Grosso. 
Abund. 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-Mamoré 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: 
Camp No. 28 170 kms. 
“ “ 39 984 “ 
“ “ 4] 306 “ 
“ “ 43 325 “ 
My study of the collection of Formicide 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 Bussey Institution, all of whom have assisted me in 
various ways. 
PONERINAE. 
1. Acanthostichus brevicornis Emery. 
Three 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 to6mm. The head 
is considerably longer than broad, with straight, parallel sides. The 
