262 
Psyche 
[December 
Mandibles < 0.80 mm long; longitudinal costulation on post- 
petiolar disc complete from anterior to posterior border 31. 
30. Size larger (HL 0.98 mm in holotype worker) ; infradental 
lamella of propodeum low and cariniform, terminating below in 
a small, obtuse ventral angle that is much smaller than the dorsal 
tooth (Fig. 24) ; antennal scape straight to its base (se. Brazil) 
sanctipauli Kempf 
Size smaller (HL < 0.85 mm) ; infradental lamella high, termi- 
nating below in a prominent tooth or angle which is subequal 
to, or often larger than, the dorsal propodeal tooth (Figs. 25-27) ; 
antennal scapes gently but distinctly curved in basal half (s. 
Mexico to Trinidad and the Guianas) cordovensis Mayr 
31. Pilosity of head, alitrunk and nodes rather abundant and con- 
spicuous, narrow-spatulate ; eyes 0.09 mm in greatest diameter; 
MI 1 00 db (Amazon Basin) rehi Forel 
Pilosity less abundant and conspicuous, that of nodes and first 
gastric segment sparse, fine and filiform; eyes 0.07-0.08 mm in 
greatest diameter; MI 94-99 (Amazon Basin) .. sublonga Brown 
32. Propodeal lamellae evenly rounded, without dorsal or ventral 
angles or teeth (Fig. 22; Colombia) hemidisca Brown 
Propodeal lamellae angulate or toothed above and/or below, 
more or less as in Figs. 23, 24 or 28 33. 
33. Propodeal lamellae without dorsal teeth or angles; ventral angle 
present and prominent (Fig. 28 ; C. America s. to Ecuador) 
biolleyi Forel 
Propodeal lamellae angulate or toothed both above and below 
(more or less as in Figs. 23-26) 34. 
34. Mandibles longer and more slender (MI > 63) ; head narrower 
(CK80) 35. 
Mandibles shorter and more robust (MI < 63) ; head broader 
(Cl 80 or more) 36. 
35. Smaller (HL < 0.80 mm), more slender (Cl < 68) ; preapical 
teeth small and crowded toward apical fork, occupying little or 
no more than the apical 1/5 of the mandibular length (Brazil: 
Pernambuco) borgmeieri Brown 
Larger (HL 0.80 mm or more), not so slender (Cl > 68) ; 
preapical teeth more widely spaced, occupying the apical 2/5, 
more or less, of the mandibular length (se. Brazil, n. Argentina) 
s aliens Mayr 
36. Larger (HL 0.80 mm or more), with heavy, distinctly arcuate 
mandibles planeti Brown 
