1898.] NATURAL SCIENCES OF PHILADELPHIA. 453 



narrow, yellow line ; superior wings fuscous on basal two-thirds, 

 especially in costal cell with dark nervures, the apical third whitish- 

 yellow, with yellowish nervures and stigma. 



Clypeus subcordate, nearly as broad as long, with large scattered 

 punctures throughout ; ocelli forming an almost equilateral triangle, 

 the space between hind pair, however, slightly less than that sepa- 

 rating them from the anterior one, and not nearly equal to half the 

 distance between them and eyes ; the latter not reaching base of 

 mandibles, being separated from them at their closest proximity by 

 a distance nearly equalling the length of fourth antennal joint; 

 pronotum short, finely margined or carinated at the sides anteriorly, 

 but not medially ; dorsulum at least one-quarter longer than broad ; 

 scutellum, postscutellum and metathorax strongly punctured, all 

 three more or less sulcate down middle, especially the middle 

 segment which has the furrow much broadened apically ; sides of 

 thorax strongly punctured ; petiole, distinctly punctured, shorter if 

 anything than hind femur, somewhat clavate, being gradually 

 broadened from before the middle, the basal third stem-like; remain- 

 der of abdomen cordate ; second submarginal cell short, much higher 

 than long aind narrowed above ; third submarginal rhomboidal, 

 higher than long, somewhat narrowed above, the outer nervure 

 sinuate. Length 13 mm. 



Chapada, September and December. Two specimens. Belongs 

 to Saussure's IV Division My. Its resemblance to P. socialis is only 

 superficial. The shape of petiole is nearly as in P. lugubris, but is 

 more slender. 



Polybia chapadae n. sp. 



9 or £. — Ferruginous; body of abdomen, sides of prothorax and 

 niesopleurpe sometimes darker; two broad oblique marks uniting in 

 V-form on front, and the occiput black ; antennae dark above ; 

 clypeus, mandibles except tips, inner and posterior orbits,two oblique 

 lines on vertex behind ocelli, lines on pronotum anteriorly and pos- 

 teriorly, two rather indistinct lines on dorsulum, scutellum and post- 

 scutellum anteriorly, tegulse, spot at top of meso- and metapleura?, 

 two broad lines on middle segment, four anterior coxse beneath, 

 stripe on hind coxse, spot at tip of all femora, (sometimes obscure), 

 and apical margin of abdominal segments 1-3 or 1-6, or the first 

 only, yellowish. 



Clypeus about as broad as long, not distinctly punctured ; ocelli 

 forming an equilateral triangle, the space between hind pair a little 



