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 

 fiat 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. Mi- 

 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 coarselj^ 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-Mamore Camp 36. This is a very distinct 

 form, the soldier differing from that of typical P. guilelmi-muUeri 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. 

 hohenlohei Forel from Brazil. The very minute epinotal spines of the 

 worker are scarcely more than angles of the margin at the bases. 



