1865.] 95 



yellow. Legs black ; extreme tips of the femora and the tibiae exte- 

 riorly, pale yellow; the latter black beneath; the four anterior tarsi 

 honey-yellow; the posterior pair blackish. Abdomen ovate, highly 

 polished, with scattered deep punctures; basal segment convex, rounded 

 at base and constricted at tip, with a white rounded or transverse spot 

 on each side ; second segment with a transverse white line on the apical 

 middle, and a subquadrate spot on each side, sometimes the middle line 

 is wanting; third, fourth and fifth segments have each a narrow, apical, 

 white fascia, deeply emarginated on each side anteriorly ; apical seg- 

 ment depressed, rounded at tip with two indistinct whitish spots at 

 base ; in some specimens the second segment has a continuous fascia, 

 very deeply and squarely emarginated on each side posteriorly; venter 

 smooth and polished, immaculate. Length 4^ lines; expanse of wings 

 71 lines. 



Huh. — " Pennsylvania," (Say, Smith) ; Massachusetts, (Ridings) ; 

 Illinois, (Dr. Lewis and Mr. Walsh); llocky Mountains, Colorado Ter- 

 ritory, (Ridings). Coll. Ent. Soc. Philad. 



Thirteen 9 specimens ; S unknown, unless it be the P. duhhts de- 

 scribed below. 



H. Philanthus simillimus, n. sp. 



Black, pubescent: face, line on collar, two spots on scutellum, line on post- 

 .scutellum, tibiae exteriorly, and fasciae on abdomen, sometimes more or less in- 

 terrupted and emarginated, whitish ; wings hyaline. 



Female. — Black, shining, head and thorax rather thickly clothed 

 with a short, fine, whitish pubescence, finely and sparsely punctured ; 

 head transversely subcompressed ; sides of the fece, extending a little 

 above the slight emargination of the eyes, a longitudinal line above the 

 insertion of each antenna, clypeus except a large black spot on each 

 lateral lobe, a line on the mandibles, and a spot behind the eyes, all 

 obscure whitish; antennae gradually thickened towards the tips, black 

 above, the scape whitish beneath, and the flagellum, except basal joint, 

 fulvous beneath. Thorax: line on the collar, two subobsolete longitu- 

 dinal lines on the mesothorax, a spot beneath the anterior wing, two 

 spots on scutellum, a line on postscutellum, and the tegulae, obscure 

 whitish ; in one specimen the collar has only a short line on each side 

 above, the mesothorax and scutellum are immaculate, and the postscu- 

 tellum has only a spot on each side; the markings are all indistinct; 

 mesothorax closely punctured, abrupt on the sides and behind, the disk 

 with a shallow longitudinal fovea. Wings hyaline, iridescent, slightly 

 tinged with pale fuscous towards the tip; nervures pale honey-yellow. 

 Legs slightly pubescent, black; apical half of the anterior femora, tips 



