336 
Psyche 
[December 
in full-face view, with a narrow but distinct occipital collar. Except 
for the head, the sculpture is as in the soldier, but the reticulation 
of the postpetiolar disc and die anterior half of the gaster is more 
superficial, and the integument here somewhat shining. Head smooth, 
mostly shining, with sparse fine short appressed hairs in addition to 
the longer standing setae; anterior cheeks, especially the parts just 
mesad of the eyes, finely reticulopunctulate and subopaque, with fine 
costulae disposed as shown in Fig. 4. Mandibles smooth and shining, 
with sparse fine punctures. Outstanding pilosity positioned as in 
soldier. 
Color light castaneous ; mandibles, antennal funiculi and legs 
brownish yellow. 
Worker variation: Of 6 paratype workers measured, only one 
differed from the specimen described above by much more than the 
average measurement error of about ± 0.0 1 mm; this is a worker 
from the Igarape Marianil berlesate that is a little larger, darker and 
more heavily sculptured than others in the sample available: TL 2.4, 
HE 0.60, HW 0.49 (Cl 81), WL 0.75 mm. It has the vertex 
largely microreticulate and su'bopaque instead of shining, and its color 
is prevailingly darker brown than the other workers. Otherwise, the 
workers show noticeable but not extreme variation in depth of colora- 
tion, and some have an extra pair of erect hairs on the mesonotum. 
Female (dealate, from type nest series) : TL 5.7, HL 1.00, HW 
1. 1 2 (Cl 112), WL 1.65, scape L 0.80, greatest diam. compound 
eye 0.31, of median ocellus o.ii mm. 
Form shown in Figs. 5, 6 and 7. Head wide, with straight pos- 
terior margin in full-face view. Antennal scapes reaching posterior 
margin of head when held straight back, incrassate and strongly 
curved at base, the incrassate portion further thickened by a jacket 
of whitish gelatinous material that collapses in dried specimens (Fig. 
5 ) ; this was much better developed in one specimen than in the other, 
and could possibly represent foreign material in part. Frontal lobes 
thick, a well-marked median sulcus extends from posterior border 
of head to a point in front of median ocellus. Clypeus with a feeble 
median carina in its posterior half. 
Alitrunk robust, mesonotum broad and depressed, sides of scutum 
produced as thick curved shelves decidedly overhanging pronotum. 
Petiole with a broad (W 0.22 mm) transverse node, its rounded 
border emarginate in the middle as seen from behind; its peduncle 
strongly depressed and broadened (W 0.15 mm), with very convex 
margins as seen from above. Petiole subelliptical, about 0.56 mm 
