1897.] NATURAL SCIENCES OF PHILADELPHIA. 251 



with strong purplish effulgence, second submarginal rhomboidal, 

 third submarginal very large, receiviug the second recurrent vein 

 between base and middle, basal vein and cubital vein of hind wings 

 interstitial. Length 12-14 mm. 



$ . — Similar to female, but more slender, the abdomen almost petio- 

 late ; legs scarcely spinose, claws with a basal prominence the ante- 

 rior pair bifid, longer spur of hind tibia? nearly two-thirds as long as 

 first hind tarsal joint ; wings brighter (aniline red and blue). 

 Length 9-12 mm. 



Santarem (February) ; Marurii (April) ; Rio de Janeiro (Nov- 

 ember) ; Chapada (December). Twelve female, ten male specimens. 

 Seems to be near P. tristis Kohl. 

 Pompilus nobilis Fabr. 



Rio de Janeiro (July, November); Santarem; Chapada (April). 

 P. multifasciatus Tasch., is probably identical with nobilis. 



Pompilus ?p. 



A series of male specimens from Santarem, which are very close, 

 in appearance, to nobilis 9 » but which probably belong to another 

 species, perhaps new. 



Pompilus sericeifrpns n. sp. 



9 . — Black, densely clothed with silvery pile, especially on the 

 sides of thorax, the abdomen sparsely ; antenna?, legs and upper sur- 

 face of thorax as far as middle segment not silvery ; clypeus with 

 fore margin broadly subtruncate, smooth and shining, otherwise 

 clothed with silky pile ; front densely clothed with pale golden pile, 

 impressed down the middle ; eyes reaching mandibles, very slightly 

 converging above, at which place they are separated by a distance 

 greater than the combined length of scape and pedicellum, but 

 much less than, that of first flagellum joint; space between hind 

 ocelli but little less than that which separates them from the eyes ; 

 antenna? rather long and slender, the first joint of flagellum nearly 

 as long as the two following joints united ; pronotum angulate be- 

 hind, transversely swollen medially ; middle segment indistinctly im- 

 pressed, posteriorly with coarse transverse stria? ; legs not very 

 strongly spinose, no tarsal comb, tarsi testaceous, claws bifid, calcaria 

 short, the longer spur of hind tibia? about one-fourth the length of 

 first hind tarsal joint; abdomen ovate, with sparse pale hairs at 

 apex ; wings subhyaline, the anteriors with two broad fuscous bands, 

 one crossing the wing at apex of median cell, the other including 



