74 
Psyche 
[March 
angles may be smoothly rounded, as in Fig. 2, or may bear very low, 
obtuse corners that also render the sides of the declivity vaguely sub- 
marginate (30 March colony) as opposed to the rounded sides of the 
declivity in the 1 April series (Fig. 2), taken less than half a kil- 
ometer away. Seen from above, trunk broadly rounded in front, 
sutureless, tapering gently caudad, with a feeble suggestion of con- 
striction behind mesonotum. 
Petiole briefly pedunculate in front, the peduncle with strong 
anterolateral cornuae, the node varying from loaf-shaped with rela- 
tively steep, rounded anterior face (Fig. 2) and rounded sides to a 
lower version with more gradually sloping anterior face and sides 
less bulging. Postpetiolar (first gastric) segment varying in dorso- 
ventral depth, especially near the posterior quarter or third of its 
length, and the individuals with deeper postpetiole tend to have the 
tergum of this sgment more swollen (or humped as seen in side view) 
than in the paratype depicted in Fig. 2. 
Integument overall smooth and decidedly shining, but head, trunk, 
node and postpetiolar (first gastric) segment thickly sown with cir- 
cular, centrally-tuberculate and piligerous foveae or coarse punctures. 
These foveae tend to be larger and more densely arranged, even sub- 
contiguous in places (e.g., in the region behind the eyes), in the 
30 March colony as compared with the series of 1 April, but the 
latter series vary greatly in this respect, even within samples from the 
same nest. The least strongly punctured individuals have the dorsa 
of trunk, node and postpetiole almost completely smooth and shining, 
the punctures here small and sparse. Antennae and legs much more 
finely and densely punctate, becoming more opaque apicad. Median 
clypeal lobe finely punctate-rugulose in a longitudinal direction ; 
mandibles striate-punctate, but shining and coarsely punctate toward 
apicolateral margins. Second gastric (IV true abdominal) segment 
smooth, shining, with sparse piligerous punctulae. Gastric apex finely 
and densely punctulate, subopaque. 
Pilosity abundant, moderate and uneven in length, of fine, sub- 
decumbent to suberect tapered hairs, a little longer but much less 
abundant than usual in Proceratium, grading into a much shorter, 
appressed to decumbent pubescence-like covering as one moves apicad 
on antennae, legs and toward gastric apex; also a fine, appressed, 
medially-directed pubescence in the space between eyes and frontal 
carinae. 
Color (of fully mature individuals) rich bright ferruginous red, 
legs and scapes often lighter and more yellowish; region immediately 
