1944] Genus Pseudomyrma 75 
prothorax not marginated; node subglobular ; petiole 
with a small tooth. Peru. 
7. Petiole with a vertical posterior face and a lamina below, 
ending in front in a triangular tooth. PI. Ill, fig. 21. 
A. picta type. Length 5.5 mm.; pronotum marginate; 
node from above trapezoidal and marginate, the mar- 
gins ending behind in blunt teeth (transitional to 
Ornatinoda). Ground color red with a complicated 
black pattern superimposed. Brazil. 
B. var. humboldi. Without postero superior teeth on the 
first node. 
Petiole shaped differently 8 
8. Petiole with a relatively long peduncle and a strong tooth, 
sometimes continued backward in a crenulated lamellae. 
PI. Ill, fig. 19 group triplaridis-maligna 
Petiole without peduncle, lamella not crenulated. PL III, 
fig. 20 group arboris-sanctce 
Group triplaridis-maligna 
A. ulei. Length 4-5 mm.; mandibles angular near the base; 
head rectangular with nearly parallel sides; color as in 
caroli. Amazonas. 
B. maligna. 
I. maligna type. Length 4-4.6 mm.; thorax submar- 
ginate; petiole from above globular; petiolar node 
abrupt behind; color deep castaneous. British Gui- 
ana. 
II. var. cholerica. Length 3-3.5 mm.; lighter colored 
than the type and weakly bicolored; without a ven- 
tral tooth on the petiole. British Guiana. 
III. var. crucians. Length 3-3.5 mm.; very dark brown, 
sometimes black. British Guiana. 
C. triplaridis. Head long and narrow; mandibles not lighter 
than the rest of the body as is almost invariably the case in 
Pseudomyrma. 
I. triplaridis type. Length 4. 5-4.8 mm.; petiolar node 
from above subhexagonal. Amazonas. 
II. subsp. biolleyi. Length 4. 8-5. 2 mm.; eyes smaller 
than in the type; node from above globular; head 
reddish brown, gaster brown, first gastric segment 
and rest of the body reddish. British Guiana. 
