1944] Genus Pseudomyrma 71 
cel and gaster shiny, rest of the body opaque. Peru. 
PI. Ill, fig. 10. The variety tuberculata. Epinotum 
with small tubercles at the junction of the base and 
the declivity. PI. Ill, fig. 12. The type lacks the 
tubercles. 
B. allidora. Length 3-3.5 mm.; intermediate between 
sericea and acanthobia in the shape of the petiole; 
differs from the former by its brown color, from the 
latter by the absence of erect hairs. Panama. 
C. weberi. Length 3.8-4 mm.; head reddish brown, 
weakly bicolored on the rest of the body; this species 
is easily recognized by the peculiar shape of its petiole 
in profile. PI. Ill, fig. 16. It is transitional to de- 
cipiens. 
Petiole with a triangular lamella in place of the antero 
ventral tooth. (Some forms have a tooth, i.e., sericea 
fords.) PL III, fig. 17 4 
4. With an antero ventral and a posterior tooth, the two teeth 
connected by a serrated lamina. PL III, fig. 19. 5 
Without a posterior tooth, but the lamella is present. PL 
III, fig. 20. Color brown 6 
5. All forms belonging here are black or very dark brown and 
all have a silky shine. 
A. sericea type. Length 4. 5-5. 5 mm.; Colombia. PL III, 
fig. 11. 
B. var. altinoda. Length 4 mm.; petiole higher than in 
the type, two-thirds as high as the thorax; differs 
from the type in color. Brazil. 
C. var. cordioe. Smaller than the type; clypeal lobe tri- 
angular. Peru. 
D. var. fortis. Length 6 mm.; base of the epinotum 
longer than the declivity. Mexico. 
E. var. huberi. Length 4.5 mm.; abdomen grayish, 
otherwise as in rubiginosa. 
F. var. ita. Length 4.5 mm.; the first node has a very 
convex anterior face, the second node is smaller than 
in the type. Costa Rica. 
G. var. longior. Length 5.5-6 mm.; clypeal lobe trian- 
gular; color as in fortis. Brazil. 
H. rubiginosa. Head black, front of pronotum deep 
