242 PROCEEDINGS OP THE ACADEMY OF [1897. 



mandibles 4-dentate at apex ; maxilla? at base with hvo long curved 

 and diverging brushes of pale hairs; maxillary palpi prominent, 

 6-joiuted ; labial palpi small, 4-jointed ; thorax oblong, compara- 

 tively longer than in Agenia ; legs rather stout, tibial spurs 1-2-2 ; 

 to the apex the claws are suddenly narrowed from their middle, 

 which point internally is formed into a small tooth ; legs not spin- 

 ose, the hind tibial slightly serrated; abdomen short and stout, the 

 first segment campulate, with a short petiole ; second ventral dis- 

 tinctly impressed transversely ; wings ample (see pi. IV, fig. 1), 

 stigma large; cubital vein of hind wing originating far beyond apex 

 of submedian cell. Type D. populator n. sp. 



Dipogon populator n. sp. PI. IV, f. 1. 



9 . — Black, more or less covered with grayish pile, especially on 

 vertex, dorsulum and scutellum ; antennse, mandibles, palpi and 

 tarsi reddish-testaceous ; clypeus transverse, short, its fore margin 

 broadly subtruncate, front not impressed ; space between hind ocelli 

 somewhat greater than that between them and nearest eye margin, 

 the space between eyes above greater than the combined length of 

 autennal joints 2 and 3 ; antenna? scarcely as long as head and 

 thorax, first joint of flagellum more than one-quarter longer than 

 second ; pronotum slightly bowed posteriorly, middle segment en- 

 tire, finely punctured, more or less rounded posteriorly ; wings clear, 

 with a fuscous fascia crossing the anteriors at the basal vein, and a 

 fuscous cloud which fills the lower half of marginal, first submargi- 

 nal and first discoidal, and the second and third submarginals and 

 third discoidal entirely ; the cloud is not strictly confined to the 

 points indicated, as it extends slightly beyond third submarginal 

 and beneath third discoidal ; nervures and stigma black ; abdomen 

 clothed with sparse, long hairs beneath and apically. Length 6 

 mm. 



Corumba (April). One specimen. 



Pompilus amethystinus Fabr. 



A large series of both sexes. Chapada (February to April) ; 

 Santarem (April) ; Corumba (April) ; Pedra Branca (April) ; 

 Uacarizal (February) ; Rio de Janeiro (October, November) ; 

 Villeta (May) ; Mararu (April). 



Pompilus echinatus n. sp. PI. IV, f. 2, 3. 



9 . — Black, with varying shades of purple and blue ; last two ab- 

 dominal segments more or less with cinereous pile, and long black 



