276 
Psyche 
[December 
4. Eyes large and conspicuous, greatest diameter = greatest width 
of antennomere 4 (Figs. 10, 14); dark brown (Costa Rica) 
oculata 
Eyes smaller, greatest diameter distinctly < greatest width of 
antennomere 4 5. 
5. Occiput, front of pronotum, mesonotum and propodeum more or 
less distinctly transversely striate or rugulose; median clypeal 
lobe without a slender tooth or process (Fig. 10) ; blackish 
brown (Ecuador) williamsi 
Head and alitrunk as seen from above uniformly and densely 
punctulate ; median clypeal lobe with a narrow tooth or process, 
variable in form (Fig. 16) ; color lighter, brown or reddish, 
or bicolored 6. 
6. Mandible 4-toothed; third tooth (counting apical tooth as first) 
at least half as large as basal (fourth) tooth, well-developed 
and acute (SE Brazil) curvata 
Mandible with only 3 well-developed teeth; broad diastema be- 
tween second tooth and basal tooth unarmed or with at most 
a few low, irregular denticles or crenulations 7. 
7. Larger species (head width usually > 0.66 mm) ; punctation of 
head, alitrunk and node coarse, separate punctures of head not 
much smaller than eye; color ferruginous red to piceous, with 
contrasting yellow or red gaster and appendages ( Brazil : NW 
Mato Grosso) jeckylli 
Smaller species (head width usually < 0.66 mm) ; punctation 
fine and shallow, separate punctures of head not more than 
about 1 /3 the size of the eye ; color yellowish-brown to medium 
brown (Central America) per garni ei 
Ackowledgements 
We owe thanks to Father W. W. Kempf, OFM, for his sending of the 
sample of S. curvata, and to the National Science Foundation for support 
under grants (GB-2175, GB-5574X), W. L. Brown, Jr., principal investi- 
gator. 
References 
Borgmeier, T. 
1950. A femea dichthadiiforme e os estadios evolutivos de Simopelta 
pergandei (Forel), e a descrigao de S. bicolor, n. sp. (Hym. 
FormicidaeV Rev. Ent., Rio de Jan., 21: 369-380. 
