70 
-Ain. J. B. BRIDGMAN ON HYMENOPTERA IN THE 
24. (15.) Thorax entirely black. 
25. (26.) Cheeks below the eyes one and half times as long as the width 
of the base of the mandibles; legs red; coxa?, apex of hind tibia? and tarsi 
blackish. *<jenalis, Moll, g £ . 
26. (25.) Cheeks below the eyes scarcoly, if at all, longer than the width 
of the base of the mandibles. 
27. (40.) Clypous covered with long dense pubescence. 
28. (29.) Second and third segments of abdomen longer than wide; 
middle of abdomen, more or less, and legs red; base black, rubicmda, 
m., <? ?. 
29. (28.) Second and third segments wider than long. 
30. (33.) Hind coxa? black ; hind tibia? biannulated, is.. apex and before 
the base dark. 
31. (32.) Hind tarsi black; extreme base pale; aculeus as long as the 
body. *milnerator, Gr., g 9 . 
32. (31.) Hind tarsi black ; joints white-ringed ; aculeus a little shorter 
than the abdomen. *hmsitator , Gr., $ 9 • 
33. (30.) Hind coxa? red ; hind tibia? biannulated. 
34. (35.) Hind trochanters black. *trooTianteraia, m., g 9 . 
35. (34.) Hind trochanters red. 
36. (37.) Fourth and fifth joints of hind tarsi of equal length ; aculeus 
rather longer than the abdomen, similis, m., g 9 . 
37. (36.) Fifth joint of hind tarsi much longer than the fourth. 
38. (39.) Keels on the first abdominal segment distinct, extending 
almost to the apex. filicornis, Tli., g 9 ■ 
39. (38.) Keels on the first segment less distinct, extending just beyond 
the middle, lineata, Desv., g . 
40. (27.) Clypeus not covered with long dense pubescence. 
41. (48.) Fifth joint of hind tarsi not longer than the fourth. 
42. (43.) Second and third segments of abdomen transverse; aculeus 
rather shorter than the body ; legs red ; apex and before the base of hind 
tibia? dark ; coxa? and trochanters of the male blaok. *resinance, Hart., g 9 • 
43. (42.) Second and third segments of the abdomen not transverse. 
44. (45.) Coxa?, and apex of hind tibiae, and tarsi black ; aculeus about 
as long as the abdomen. *iores, Gr., g 9 • 
45. (44.) Coxa? not black. 
46. (47.) Legs red ; front coxa? and scape beneath, of the male, yellow ; 
aculeus a little shorter than the abdomen. flavipes, Desv., g 9 . 
47. (46.) All the coxa? of male red; scape beneath not yellow; hind 
tibia? biannulated; base and base of tarsal joints pale. Female not known, 
or undescribed, punctifrons, Tli., g. 
48. (41.) Fifth joint of hind tarsi decidedly longer than the fourth, 
especially of the female. 
49. (52.) Hind tibia? and tarsi white, or whitish, dark ringed. 
50. (51.) Middle of hind tibiae clear white; aculeus rather longer than 
the abdomen, pedata, Desv., g 9 • 
