262 
Psyche 
[September 
curved, opposing the large pectinate tibial spur; other metatarsi 
straight, weakly clavate. Tarsal claws small, slender, simple. 
Petiole with a massive subcubical node, a brief, slender, but dis- 
tinct anterior peduncle, and a very short posterior peduncle. Both 
anterior and posterior faces of the node are vertical, and the petiole 
is connected to the gaster only by the narrowly strangulated con- 
nection of the posterior petiolar peduncle to the short anterior 
peduncle of the first gastric (postpetiolar) segment. Postpetiole 
(first gastric segment = true abdominal segment III) reduced in 
size, only slightly broader than petiole ; much smaller than the 
following segment, and showing a very slight beginning of constric- 
tion from the latter (constriction a little more distinct in the queen). 
Sternum of postpetiole especially reduced, only weakly convex and 
with only a suggestion of bilateral anteroventral processes on either 
side of a shallow anteromedian impression. Second gastric (IV 
abdominal) segment the longest, widest and deepest of the gaster; 
larger than the remaining apical segments taken together; these 
taper to a rounded apex from which issues a very long, slender, 
curved sting. Postpetiolar tergum and the terga of all succeeding 
segments of gaster easily and cleanly separable from sterna. 
Entire body shining, smooth, with abundant small, distinct, spaced 
punctures on dorsum of head, becoming fewer and smaller on truncus 
and remainder of body; legs and antennal funiculae becoming more 
densely and finely punctulate apicad ; cervix and a few other areas 
on sides of truncus and node loosely reticulate. 
Entire body (except lower sides of truncus) and appendages 
covered densely (more sparsely on underside of petiole and gaster) 
with short, fine, pointed hairs. 
Color ferruginous yellow ; mandibles and appendages lighter yellow. 
Queen, alate: Like the worker in general form of body, but more 
robust overall. Eyes well-developed, pigmented and moderately 
convex, with about 10 facets across the greatest diameter, situated 
Plate 2. Apomyrma stygia, same worker as in Plate 1, scanning electron 
micrographs by H. E. Hinton. G, posterior part of truncus, oblique lateral 
view, X 86. H, petiole and associated structures, lateral view, X 87. 
I, closer view of propodal-petiolar articulation, showing details of sculpture 
and of spiracles, X 203. J, lateral view of hind tibial apex, showing 
coarsely pectinate smaller spur lying over larger, broader, more regularly 
and finely pectinate medial spur, X 203. K, portions of the 3 apical seg- 
ments of an antenna, showing reclinate peg-like sensilla and finer setae. 
X 428. L, end of front tarsus, showing a tarsal claw, X 473. 
