1944] Genus Pseudomyrma 63 
of the petiole in profile is straight or even convex 
Apedunculata , PL II, fig. 13-15 
Pedicel of different shape; with the node transversely oval, 
or trapezoidal, or globular, or triangular, but always 
with a very broad and short peduncle 
Latino da, PL II, fig. 17-22 
Detailed keys to the groups and species 
Branch Ornatinoda 
1. Pedicel in profile long and low, with the upper border al- 
most horizontal. PL III, fig. 3 tenuissima Emery 
Petiole in profile higher ...2 
2. Pedicel in profile with a high rounded node. PL III, fig. 1 
group excavata 
Petiole in profile with a sharp or blunt superior-posterior 
corner. PL III, fig. 2. 
A, — Posterior face of the node straight. PL II, fig. 2 .... 
group tenuis 
B. — Posterior face of the node convex 
group picta-schuppi 
The group picta-schuppi is transitional to the branch 
Latinoda and some of its forms are listed there. We include 
under Ornatinoda the following additional forms: 
1. gebelli — which has a transverse suture on the 
petiolar node. 
2 . excissa — the node with a strong semilunar excava- 
tion. 
3. schuppi var. geraensis — which has the node exca- 
vated on top. 
The remaining forms of schuppi we have placed near 
belti , following Forel. 
Group tenuis 
1. tenuis , typical. Length 5 mm. Entirely yellow-ochrous ; 
sides of the head very convex; basal face of the epinotum 
with a longitudinal impression; node from above long and 
narrow; prothorax strongly marginate. Maranho, Brazil. 
2. var. parcensis. Length 5 mm. Yellowish; mesonotum 
broader than long (as long as broad in the type) ; node with 
rounded angles instead of sharp corners; posterior face of 
node a little convex. Para, Brazil. 
