1966] 
Gotwald and Brown- — - Simopelta 
267 
Simopelta jeckylli 
Belonopelta jeckylli Mann, 1916, Bull. Mus. Comp. Zool. Harv., 60 415, 
pi. 2, fig. 12, 13, worker. Type locality: Camp 39, Madeira-Mamore 
R.R., Mato Grosso, Brazil. 
Simopelta jeckylli: Wheeler, 1935: 14, fig. 2, worker. 
S. jeckylli is a relatively large, brightly-colored form (forebody 
piceous to bright ferruginous red, gaster contrasting red or yellow) 
with densely punctulate head and alitrunk. Clypeal spine present; 
only 3 well-developed mandibular teeth. No tooth on “mesoster- 
num.” Known only from the type collection, which consisted of 
workers from under forest litter that appeared to be “traveling in 
a definite direction,” a description that suggests a foraging column. 
Simopelta williamsi 
Simopelta ‘williamsi Wheeler, 1935: 14, fig. 3, worker. Type locality: Naran- 
japata, Ecuador, at about 600 m. 
This species lacks a median clypeal spine, has very small eyes, and 
has the large basal tooth of the mandible truncate, with the truncate 
apex often even slightly concave. Piceous in color. Known only 
from the type collection. 
Simopelta oculata new species (Figures 1-14) 
Holotvpe worker: TL 3.8, HL (without median lobe of clypeus, 
i.e., measured to anterior border of frontal lobes) 0.80; HW (with- 
out eyes) 0.58; WL (diagonal length of alitrunk as seen from side) 
1.34; greatest diameter of eye 0.10; scape L (chord, without basal 
neck) 0.76 mm. Abbreviations as in Brown (1958: 254). Cephalic 
index (Cl) 73. 
Similar to worker of S. williamsi, but differing in the following 
ways : 
1. Mandibles more slender, with the basal tooth simple and acute 
(basal tooth broad and truncate in williamsi ) . 
2. Eyes notably larger than in williamsi or the workers of any 
other species in the genus so far known, but still composed of only a 
single convex (fusion) facet. 
3. Antennal scapes longer; when laid straight back in full-face 
view, surpassing the occipital margin by distinctly more than their 
greatest apical thickness (by less in williamsi). 
4. Alitrunk, especially the propodeum, both absolutely and rela- 
