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 NaturaUst on the 

 River Amazons. It is the common fire ant ("formigo do fogo" of 

 the Brazihans) 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 b}' 

 Forel I am certain that the name given by the former author applies 

 to this species. 



118. Leptothorax (Goniothorax) echinatinodis Forel subsp. spininodis 



Ma>T. 



Plate 4, fig. 36. 



Many workers and males from colonies which were nesting in 

 twigs at Independencia, Ceara-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-Mamore Camps 39 and 41, and at Abuna, Bolivia. 



121. Cryptoccrvs iCephalotes) atratus (Linne). 



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 



