MANN: THE ANTS OF BRAZIL. 427 
first funicular joint as long as second and third together. Metano- 
tum evenly convex. First petiolar node elongate, slightly petiolate 
in front, about 14 times as long as second node, which is globose. 
Color yellowish brown, abdomen fuscous; epinotum with a faint 
median longitudinal fuscous stripe. 
75. Pseudomyrma elegans F. Smith. 
Found frequently in the vicinity of Manaos. This is the only known 
ground-inhabiting species of the genus. The nests found were in 
bare places along the roadside. The entrance is circular, about two 
millimeters in diameter, and directly on the surface, without a mound. 
76. Pseudomyrma elongata Mayr. 
Many colonies found at Cearé-Mirim and Independencia. One 
large tree at Ceard-Mirim contained hundreds of colonies nesting in 
hollow twigs and in galls, scarcely a dead twig or a gall being without 
them. The twigs inhabited are those hollowed naturally or bored by 
other insects. Pseudomyrma elongata is decidedly beneficial to the 
tree in keeping away insect enemies. The tree mentioned was 
especially well protected, having several Azteca colonies and some 
populous wasp nests in addition to the Pseudomyrma. 
77. Pseudomyrma sericea Mayr var. altinoda, var. nov. 
Worker. Length 4 mm. 
Head one and one third times as long as broad, slightly broader in 
front than behind, with convex sides and concave posterior border. 
Clypeus with distinct notch at middle. Eyes large. Antennal scape 
reaching one third its distance from place of insertion to posterior 
border of head. Basal funicular joint not as long as two succeeding 
joints taken together. Pronotum with well-defined margin. Pro- 
mesonotal and mesoépinotal sutures equally pronounced. Mesono- 
tum small, seen in profile lower than pro- and epinotum, transverse, 
about one half the length of the pronotum. Epinotum longer than 
pro- and mesonotum together, evenly convex above; its declivity 
shorter than length of basal surface; angle between the two sur- 
faces much rounded. Petiole two thirds as long as thorax, its nodes 
higher than epinotum, equal in length; anterior node convex in front, 
