66 NOTES ON MEXICAN ANTS. 

























Pseudomyrma thoracica. “Cordova. In the trunks and : 
under the neu of trees, in societies which are sometimes | 
very numerous.’ ' 
Two other species of Pseudomyrma from South America A 
have been observed by Mr. Bates, P. oculata and P. termi- 
'taria, which construct their dwellings in chambers in the 
outer walls of the tunnels of different species of Termes, or 
white ants. Still another species, with small colonies, con- i 
structs its formicarium in the pith-tube of dried twigs. 
From this variety of habits there would seem to be no defi- 
nite rule laid down for the genus, as in Formica and Myr ~ l 
mica. Each species or group of species must be studied 
separately, although the whole genus may meet on common | 
ground, as to its manner of procuring food and mode $i 
transformations. 1 
The genus Atta has. two nodes in the peduncle. The ; 
wings are larger than the body, with one marginal and three 
duhoasieinal cells, the third sometimes incomplete, the second 
bell-shaped. The large workers have greatly develop 
heads, and the corslet, or thorax, is without spines. Thit 
genus belongs to the subfamily Attidæ of Mr. Smith. 
Atta ebypeate Smith. (British Museum Catalogue of H 
menoptera, Vol. VI, p. 169.) Mr. Smith describes only the 
male and female. The worker minor from Orizaba, Mexico, 
agrees tolerably well with the description. 
Another genus of this group is’ @codoma. It differs from 
Atta externally, in having the corslet armed with ie 
and in the fore wings are two submarginal cells, the 
being incomplete. 
Gis Mexicana Smith. (Fig. 9, female; 10, wo 
major.) (British Museum Catalogue of Hymenoptera, 
VI, p. 185.) “This species is unfortunately too abunda 
in Mexico, in the temperate departments of the gulf ¢ 
such as those of Orizaba, Cordova, ete. The neuters i A 
_ known in Mexico under the name of arrieras, or hormi 
arrieras, from the similarity presented by their mare 


