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 1| times as long as second node, which is globose. 



Color yellowish brown, abdomen fuscous; epinotum with a faint 

 median longitudinal fuscous stripe. 



75. Pseudomyrma clcgans 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 Ceara-Mirim and Independencia. One 

 large tree at Ceara-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 mesoepinotal 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. 



