: Challenger ” Hymenoptera. 409 
but very conspicuous below the black tegulz, and on the sides. 
Mesothorax velvety black or silky green, according to the light. 
Metathorax inky black, with a double longitudinal carina, 
and transversely striated; abdomen black, tinted with verdigris- 
blue on the upper side; legs black, violet-blue above; wings 
violaceous, an indistinct transverse yellowish crescent near 
the end of the radial cell; face, thorax, and tip of abdomen 
clothed with rather long divergent hairs. 
Bahia, Sept. 1873. 
Allied to P. mutabilis, St.-Farg. 
30. Pepsis cerulea. 
Sphex cerulea, Linn. Syst, Nat. ed, x. vol. i. p. 571 (1758). 
St. Thomas, March 1873; Bahia, Sept. 1873. 
31. Pepsis stellata. 
Sphex stellata, Faby. Ent. Syst. ii. p. 217 (1798). 
St. Thomas, March 1873. 
32. Pepsis xanthocera. 
Pepsis xanthocera, Dahlb. Hym. Eur. i. p. 120 (1845). 
San Jago, Cape Verdes, Aug. 10, 1873. 
DIPLOPTERA. 
Eumenide. 
33. Humenes colona. 
Eumenes colona, Sauss. Guépes Solit. p. 70 (1852). 
St. Thomas, March 1873. 
34. Odynerus atlanticus. 
Long. corp. 4 lin. 
Female.—Black, closely punctured ; clypeus convex, biden- 
tate at the apex ; sides and lower surface of clypeus, a dot 
between the antenne, their lower surface, especially the 
scape beneath and towards the tip, prothorax above, and 
the sides in front, tegule, and legs red; mesothorax with 
a shallow and inconspicuous channel above, on each side; 
abdomen: first segment red, with a black spot in front ; 
second segment black above, with the sides, hinder edge, 
and under surface red ; wings smoky hyaline, with blackish 
nervures. 
St. Vincent, Cape Verdes, July 1873. 
Differs from most other black species with red markings 
by the black scutellum. 
Ann. & Mag. N. Hist. Ser, 5. Vol, xiii. 27 
