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, everywhere 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-Mamoré R. R. 
78. Pseudomyrma gracilis Fabricius subsp. carapuna, 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. Mesoépinotal 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 throughout; 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 Abund. 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. 
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