448 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
described by Smith from specimens sent to him by Bates and of which 
the latter has given an interesting account in his Naturalist on the 
River Amazons. It is the common fire ant (“formigo do fogo” of 
the Brazilians) of the Amazonian region, where it occurs generally 
in cultivated districts and is a bad pest. The colonies are large and 
numerous and the individuals highly aggressive, and, because of their 
numbers and painful sting, very formidable. 
Smith’s name has long been included with the synonyms of S. 
geminata, and S. saevissima was redescribed as S. pylades by Forel, 
but from field observations, compared with the notes of Bates and 
Smith and compared with specimens of S. pylades determined by 
Forel I am certain that the name given by the former author applies 
to this species. 
118. Leptothorax (Goniothorax) echinatinodis Forel subsp. spininodis 
Mayr. 
Plate 4, fig. 36. 
Many workers and males from colonies which were nesting in 
twigs at Independencia, Ceard-Mirim, and Manaos agree closely 
with Mayr’s description, except that in the entire series before me the 
tips of the femora are distinctly infuscated. 
The types of this species were taken from an egg-case of a species 
of Mantis from a doubtful locality. 
119. Tetramorium (Tetrogmus) simillimum F. Smith. 
Several workers of this tropicopolitan species were taken at Manaos. 
120. Wasmannia auropunctata (Roger). 
This is one of the most widely spread Neotropical ants. It was 
taken in Brazil at Natal, Independencia, Itacoatiara, Manaos, Porto 
Velho, Madeira-Mamoré Camps 39 and 41, and at Abuna, Bolivia. 
121. Cryptocerus (Cephalotes) atratus (Linné). 
Common throughout northern Brazil. Taken by the Expedition 
at Para, Manaos, Itacoatiara, and on the upper Rio Madeira. The 
species nests generally in hollowed branches of high trees, though one 
