452 PROCEEDINGS OF THE ACADEMY OF [1898. 



down middle, subconcave ; petiole of abdomen slender, but broadened 

 from beyond middle, so tbat it becomes somewhat infundibuliform, 

 in length longer than hind femur ; remainder of abdomen ovate ; 

 wings brownish basally and in the costal cell, otherwise dark sub- 

 hyaline, with nervures and stigma brownish ; third submarginal 

 cell rhomboidal, higher than long, its outer nervure strongly sinuate. 

 Length 12-13 mm. 



Chapada, October. Three specimens. Belongs apparently to 

 Saussure's IV Division My., and is allied to P. constructor. Viewed 

 from above the shape of petiole greatly resembles the lower part of 

 a horse's fore leg seen from the front, the swollen portion represent- 

 ing the hoof. 



Polybia flavitincta n. sp. 



9 or $ . — Black, with a dense silky,brown pile ; flagellum, tegulse 

 and legs from tip of femora, ferruginous brown ; a narrow line on 

 pronotum posteriorly, and at apex of petiole, yellowish. 



Clypeus a little broader than long, with a few large punctures 

 anteriorly ; ocelli in a high triangle, in consequence of the hind pair 

 being much closer than they are to the anterior one ; flagellum sub- 

 clavate, the first joint a little longer than the two following united ; 

 eyes almost reaching the mandibles ; pronotum tolerably well devel- 

 oped above, not margined or ridged ; dorsulum broad and short, its 

 length barely one-fifth greater than its width ; middle segment short, 

 almost perpendicular, strongly sulcate down middle, and with dis- 

 tinct separated punctures, and silvery pile apically ; petiole of 

 abdomen elongate, about as long as hind femur, slender basally and 

 suddenly broadened beyond middle, so that it presents an infundi- 

 bulate appearance; remainder of abdomen short-ovate; superior 

 wings strongly yellowish anteriorly, otherwise the wings dark sub- 

 hyaline, nervures and stigma yellowish ; second submarginal cell 

 quite triangular ; third submarginal rhomboidal, higher than long, 

 distinctly narrowed above, its outer nervure a little curved near the 

 top. Length 14 mm. 



Santarem. Two specimens. Allied to P. lugubris. In colora- 

 tion it more closely resembles P. angulicallis, but the prothorax is 

 not produced as in that species. 



Polybia tinctipennis n. sp. 



9 or $.— Black, with brownish silky pile; legs and tegula? 

 brown ; posterior margins of pronotum and petiole with an obscure 



