1897.] NATURAL SCIENCES OF PHILADELPHIA. 255 



Pompilus fragilis Sm. 



Chapada (December, April) ; Corumba (April, May) ; Santarem 

 (May). Eight specimens. 



Pompilus ruficoxalis n. sp. 



$ . — Head, thorax and legs black with purplish pile ; abdomen 

 bluish ; four hind coxa? red ; anterior margin of clypeus slightly 

 incurved or rather subtruncate ; front with impressed line ; eyes 

 separated from base of mandibles, inner margins parallel, separated 

 above by a distance about equal to the third and half of the fourth 

 antennal joints ; space between hind ocelli less than half that separ- 

 ating them from eyes; antenna? slender, -first joint of flagellum one- 

 third longer than second; pronotum angulate behind; scutellum 

 elevated, strongly compressed ; middle segment, sloping from base 

 to apex, with scarcely any convexity, parted for two-thirds its length 

 by an impressed line ; legs rather weakly spinose, claws of fore and 

 medial tarsi bifid, the hind ones simple, longer spur of hind tibia? 

 equal to about half the length of first hind tarsal joint; abdomen 

 compressed, subpetiolate, sixth ventral segment deeply and narrowly 

 emarginate in middle of apical margin, subgenital plate elongato- 

 acuminate, rather densely hirsute ; wings dark fuscous, with purplish 

 reflection, second submarginal.cell rhomboidal, slightly higher than 

 broad, third very large, narrowed less than one-half toward mar- 

 ginal. Length 12 mm. 



Chapada (May). One specimen. The dark body and red medial 

 and hind coxa? form a contrast in coloration which is apparently 

 unique in the Pompilida?. 



Pompilus sulcatus n. sp. PI. IV, f. 15. 



$ . — Black ; face, clypeus and thorax on sides and beneath with 

 pale grayish pile, the pronotum anteriorly, and base dorsal abdom- 

 inal segments 1-3, or 4, with plumbeus pile; flagellum beneath and 

 tegula? obscurely testaceous ; head rather flat, the occiput somewhat 

 sunken; front with punctures running into irregular stria?; clypeus 

 with fore margin slightly incurved ; eyes well separated from base 

 of mandibles, the inner orbits converging from above their middle, 

 separated above by a distance greater than the length of pedicellum 

 and first flagellum joint united ; space between hind ocelli more 

 than one-third greater than that between them and eyes ; antenna? 

 about as long as head and thorax, the first joint of flagellum but 

 little longer than the second ; cheeks scarcely developed ; pronotum 

 evenly rounded and convex, angulate behind ; middle segment sub- 



