1899.] NATURAL SCIENCES OF PHILADELPHIA, 457 



and stigma black; third submargiual higher than long. Length 

 7-8 mm. 



Var. (?;. Coloration darker ; punctuation more even ; petiole 

 with stem slender. 



c?. — Colored like 9, and similarly punctured; petiole a little 

 longer than thorax, the enlargement beginning behind middle, 

 with an indistinct pit or fovea before apex; ventral tubercle larger; 

 flagellum clavate; seventh ventral plate rounded at apex, smooth; 

 wings paler, much less strongly fuscous along costa. Length 

 7 mm. 



Corumba, April, May. Twenty-four females; one male. 



A A. Petiole of abdomen with a short thick base, the apical por- 

 tion lengthened, with its sides more or less parallel. 



a. Second segment not or but little compressed. 

 Eumenes chalicodomae Sauss. 



Ten specimens. Chapada, February, March; Corumba, April; 

 Santarem. The amount of rufous on head and thorax is variable, 

 and the apical yellow fascia of petiole is sometimes wanting. 

 Eumenes canaliculatus Oliv. 



A large series of both sexes, from various localities. The wings 

 vary from fuscous to yellow fuscous, and the thorax from dark 

 brown to light rufous; the dorsulum may; be entirely reddish or 

 maculated with black. The varieties in the collection before me 

 are as follows: 



I. Wings dark fuscous. 



1. Dorsulum entirely red. 



2. Dorsulum with a black median stripe and lateral spot. 



II, Wings fuscous, tinged with yellow, especially along costa. 



1. Dorsulum entirely red. 



2. Dorsulum with a median black stripe. 



3. Dorsulum with a black median stripe and lateral spot. 



aa. Second segment compressed. 



Eumenes filiformis Sauss. 



Santarem. One specimen. 

 Eumenes rufomaculata n. sp. 



?. — Black; clypeus except medially, scape, pedicel, pronotun^ 

 mesopleurte, two large spots on dorsulum, scutellum,'postscutellum 



