1899.] NATURAL SCIENCES OF PHILADELPHIA. 437 



sulum with larger shallow punctures, with a slender raised 

 line anteriorly in middle, the usual posterior impressions indis- 

 tinct or. wanting, on each side near the tegula there is a short, 

 fine, raised line; scutellum convex, impressed; postscutellum 

 carinate laterally, Avith a small tubercle medially; middle seg- 

 ment concave medially, the concavity bounded outwardly by a 

 sharp carina, beginning at each side of postscutellum in the shape 

 of a lamella and gradually decreasing to a slender ridge, space 

 between these and the sharp lateral carina rugoso-punctate, sides 

 a little roughened apically, lateral carina reaching to the insertion 

 of abdomen gradually increasing in height frora^ base until it is 

 almost laminate at apex; tarsi flattened, unusually short, hind 

 tibiae more or less distorted, the outer margin being strongly sinu- 

 ate; petiole with stem short and thick, the enlarged portion 

 strongly punctured, rounded at base, the sides only narrowed to 

 apex from their apical fourth, and then only slightly ; second 

 segment above with shallow punctures, beneath with large sparse 

 punctures, the stem short and thick ; second submarginal cell with 

 a radial side a little shorter than the distance between the first 

 transverso-cubital and first recurrent nervures on the cubital ner- 

 vure; third submarginal cell subquadrate, oblique, broadened 

 above, the outer nervure angulate medially. Length 16 mm. 

 Chapada, March. Two specimens. 



A. Petiole of abdomen with a long slender base, swollen at 

 apex, more or less campanulate. 

 a. Head from front as long as broad. 



Eumenes chrysothorax Sauss. 



One specimen. Corumba, April. 



Eumenes sericea Sauss. 



Same locality and month as the preceding; also Sautarem. 

 Four specimens. 



Eumenes bipartita n. sp. 



9 . — Black, with sericeous pile ; mandibles yellow, black within 

 basally, reddish at apex ; flagellum beneath near apex, four ante- 

 rior tibite and tarsi more or less, and a ring on petiole near base, 

 reddish ; front subconvex with indistinct, shallow punctures, 

 medially impressed ; ocelli in a curved line ; clypeus feebly punc- 



