1898.] NATURAL SCIENCES OF PHILADELPHIA. 455 



Var. — Reddish-testaceous, with the yellow marking ohscure, the 

 stripe on dorsulum wanting; black spot on vertex quite prominent. 



Chapada, September ; Santarem. Twelve specimens. Belongs 

 perhaps to Saussure's II, Division Iota, but the third submarginal 

 cell is longer than high ; otherwise it agrees with the characteristics 

 of that group. It has a strong superficial resemblance to some 

 species of Gorytes. The variety mentioned comes from Santarem. 



Polybia suffusa n. sp. 



9 or ^ . — Black ; scape and pedicel, pronotum more or less, 

 body of abdomen, and legs in part, obscure ferruginous-brown ; 

 mandibles, fore margin of clypeus, spot on inner orbits at base of 

 clypeus and at bottom of cheeks, pronotum anteriorly and posteriorly, 

 two spots on mesopleura, one at top of metapleura, scutellum, post- 

 scutellum, middle segment except on sides, base of petiole and a 

 fascia at its apex which is extended along the sides, and a fascia at 

 apex of segments 2-5, yellow ; head and thorax with a golden pile, 

 not very dense, however. 



Clypeus broader than long, not distinctly punctured, its fore mar- 

 gin acutely angulate ; front with shallow punctures ; ocelli form a 

 high triangle ; eyes barely reaching base of mandibles, at any rate they 

 are more distant than in P. pediculata, to which suffusa is related ; 

 flagellum clavate, the first joint nearly as long as three following 

 united; dorsulum about as broad as long; middle segment with 

 shallow punctures, strongly furrowed down middle, more so than in 

 pediculata ; petiole, if anything, slightly longer than hind femur, 

 slender, strongly dentate behind middle, and a little dilated from 

 the teeth to apex ; remainder of abdomen cordate ; wings sub- 

 hyaline, strongly iridescent ; nervures and stigma dark brown ; 

 third submarginal longer than high, three times as long as second, 

 slightly narrowed above, the outer nervure sinuous. Length 7-8 mm. 



Chapada, May and October. About 60 specimens. This species 

 is closely allied to P. pediculata, but differs in coloration, less tri- 

 angular second submarginal, and generally more slender form. 

 The petiole is shaped almost precisely as in pediculata. 



Polybia frontalis n. sp. 



9 or $ , and $ . — Black ; front, clypeus and most of scape, red- 

 dish-yellow ; posterior orbits, narrow line on pronotum anteriorly 

 and posteriorly, spot beneath wings, postscutellum except apex, tips 

 of all femora, spot at tips of four anterior tibise, and a narrow line, 



