428 bulletin: museum of comparative zoology. 



declivous behind; posterior node nearly globose, broader than base 

 of first segment of gaster. Gaster about as long as thorax. Legs 

 robust. 



Body opaque, ever\'iv\iiere with a fine mat of pale pubescence, and 

 short, erect, pale pile. 



Color fuscous, antennae and legs lighter. Differs from typical 

 P. sericea in smaller size and fuscous color. Pseudomyrma sericea is 

 black throughout, and the gaster is more robust. 



Described from two workers from Porto Velho and one from Camp 

 39 Madeira-Mamore R. R. 



78. Pseudomyrma gracilis Fabricius subsp. carapiina, subsp. nov. 



Worker. Length 10 mm. 



Head, excluding mandibles, slightly longer than broad, contracted 

 behind, with convex sides and slightly concave occipital border. 

 Mandibles large and thick, with finely dentate blades. Clypeus 

 small, slightly convex, anterior border truncate at middle. Antennal 

 scape extending past opposite the middle of eye; first funicular joint 

 three times as long as broad and longer than the second, apical joint 

 as long as the two preceding together. Pronotum flat, with straight, 

 distinctly margined sides and narrrowly rounded, projecting humeri. 

 Mesothorax transverse. Mesoepinotal suture as long as the. pro- 

 and mesonotum together, nearly as broad behind as in front; its 

 basal surface margined at sides, shorter than the declivity. Peduncle 

 of petiole nearly as long as the node; node elongate-globose. Post- 

 petiole longer than broad, pyriform, nearly twice as broad as petiolar 

 node. Gaster long and slender. Legs with slightly thickened 

 femora. 



Subopaque; petiole, postpetiole, and gaster shining; finely, densely 

 punctate tlu-oughout; mandibles subopaque, finely punctate. 



Pubescence more abundant than in typical P. gracilis, white. 

 Pilosity short and abundant on head and thorax, longer and more 

 sparse on petiole, postpetiole, and gaster; black in color. Head, 

 thorax, epinotum, and legs black, the tarsi brown; petiole, post- 

 petiole, and gaster bright ferrugineous. 



Described from two workers taken on a shrub at Abuna. This 

 form is very distinct from the other varieties of P. gracilis in its much 

 larger size, and the bicolored body. In the latter respect it resembles 

 P. agilis Emery from Central America, but is very much larger. 



