\ 
430 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Color black, except the legs and apex of antennae which are cas- 
taneous. 
Worker. Length 2.55 mm. 
Head, excluding mandibles, as broad as long; sides and occipital 
margin evenly rounded. Mandibles long, slender, with three teeth 
apically. Clypeus slightly convex; anterior border truncate. An- 
tennal scapes extending half their length beyond the occiput. Pro- 
thorax rounded, elevated. Promesonotal impression indistinct. 
Mesonotum in profile convex above, declivous behind. Epinotum 
flat and narrow above, the sides and posterior border slightly mar- 
gined; the spines barely perceptible. Node of petiole in profile 
rounded above. Postpetiole a little broader than long, with rounded 
sides. Legs long, the femora and tibiae somewhat swollen. M1i- 
nutely punctate and shining. Base of epinotum transversely carinate. 
Pilosity as in the soldier. , 
Color fuscous; petiole, postpetiole, and legs testaceous fuscous. 
Female. Length 5.5 mm. 
Head, excluding mandibles, broader than long, sides slightly con- 
vex; border of occiput only slightly concave. Mandibles similar to 
those of soldier. Antennae short, scapes extending three fourths the 
distance to occiput. Eyes large, located in front of middle of head. 
Other characters as in the soldier. Thorax flattened above, declivous 
in the epinotal region, the epinotal spines short and stout. Post- 
petiole twice as broad as the petiole, the sides drawn out into distinct 
cones. Gaster one and one half times length of head. Sculpture of 
head similar to that of the soldier. Pro- and mesothorax longitu- 
dinally striate. Epinotum sparsely and coarsely punctured. Gaster 
with fine punctures, shining. 
Wings. Length a little over 5 mm. Slightly infuscated. Veins 
light fuscous. 
Described from workers, soldiers, and a single female from a colony 
taken at Madeira-Mamoré Camp 36. This is a very distinct 
form, the soldier differing from that of typical P. guclelmi-miillert in 
its smaller size, darker color, stronger cephalic sculpture, and in being 
much less shining. The worker is more shining and much darker 
than the soldier. It is much smaller than the closely related P. 
hohenlohet Forel from Brazil. The very minute epinotal spines of the 
worker are scarcely more than angles of the margin at the bases. 
