1944] Genus Pseudomyrma 61 
advised us to include these descriptions in this paper. 
Other undescribed forms were found in the unidentified ma- 
terial of the collection of the Museum of Comparative Zoology; 
the remainder of the newly described forms are material col- 
lected by us and for us in Central and South America. 
Genus Pseudomyrma (Latreille). 
Pseudomyrma is the only American genus of Forel’s Pro- 
myrmicinae (Promyrmicini of some writers), which includes the 
following tribes and genera: 
I. Tribe Metaponini Forel 
1. Genus Metapone Forel 
II. Tribe Pseudomyrmini Forel 
1. Genus Sima Roger 
2 . Genus Pseudomyrma Latreille 
Branches . 3 
Branch Ornatinoda. PI. II, fig. 1, 2 ; PI. Ill, fig. 1, 2, 3. 
Characters: The petiole with angular or rounded projections 
above and behind; or deeply excavated above; or with longi- 
tudinal or transverse impressions. This branch corresponds 
roughly to Emery’s group tenuis. 
Type: Pseudomyrma tenuis (Fabricius). 
Groups: excavata , tenuis , picta-schuppi. 
Branch Clavanoda. PI. II, fig. 3, 4, 5; PI. Ill, fig. 15; 
PI. IV, fig. 26-35. 
Characters: The petiole is clubshaped, with a long thin pe- 
duncle in front, and is not or only weakly marginated at the 
sides. This branch corresponds to Emery’s group gracilis. 
Type: Pseudomyrma gracilis (Fabricius). 
Groups: laevigata , solisi , mutica , gracilis. 
Branch Triangulinoda. PI. II, fig. 6-12. 
Characters: The pedicel from above has approximately the 
shape of a triangle, usually with rounded corners and convex 
sides; the peduncle is much shorter than in the preceding 
branch. The node is margined or submargined in some of the 
forms. 
Type: Pseudomyrma spinicola Emery. 
Groups: dolichopsis , sabanica, championi, spinicola , elegans. 
3 An explanation of this term has been given on p. 60. 
