170 
Psyche 
[June-September 
Queen 
(Figs. 1-4, Table 1) 
Two specimens (Museum of Comparative Zoology at Harvard 
University) taken by Maria del Carmen Hincapie from nests in soil 
behind the beach at Bahia Gairaca, about 20 km. by road east of 
Santa Marta, Colombia, in Parque Nacional Tayrona, on 2 dif- 
ferent days, April 22, 1978 (#780422-6) and April 26, 1978 
(#780426-9). The following description is based primarily on the 
first specimen, with occasional remarks on the second if they differ 
in some way. For each measurement, that of the first specimen is 
followed by that of the second. 
Mandibles subtriangular; basal and masticatory borders meet at 
obtuse angle; outer border gently convex, slightly flattened mid- 
length; masticatory border with 5 teeth increasing in size apically, 
the second tooth with a denticle on its distal edge (second specimen 
with denticle reduced on one mandible, absent on the other). Palpal 
formula 3,3 as determined from undissected specimens; neither palp 
reaching posterior margin of buccal cavity. Labrum with rounded 
lobes on either side of a sharp median emargination. Head (fig. 4) 
about as wide as long; in full face dorsal view occiput broadly V- 
shaped, with distinct occipital lobes; sides of head gently convex on 
temples to small bulge behind the eye, then indented to flat cheeks. 
Middle of clypeus weakly convex overall, both transversely and 
longitudinally; sculpture stops a weak median carina short of 
reaching apron; apron narrow, leading edge convex with median 
tooth bracketed by low rounded lobes; lateral arms form low 
narrowly rounded ridges in front of antennal fossae. Frontal 
triangle reduced to a narrow, deep Y-shaped sulcus separating 
clypeus from posterior % of frontal lobes. Frontal lobes short, well 
separated; carinae convex. Eyes small, convex, ringed by a round- 
bottom sculptured groove. 
Antennae 12-merous. Scape short and rather thick, not reaching 
vertex of head; bent at a nearly right angle within basal !4 of length 
and largely flat beyond (extensor surface viewed from side). First 2 
segments of flagellum longer than wide, L 0.21, 0.20; 0.18, 0.18; 
segments 3-7 wider than long; segments 8-1 1 about as long as wide. 
Apical segment much longer than any other, L 0.34, 0.37; apex 
narrowly rounded. Last 4 segments constitute a weakly defined 
