bi 
228 THE ENTOMOLOGIST. 
Antenne and legs red. - - . - 29. transfuga, 14 line. 
2. Pubescence on the abdomen scattered. 
a. Thorax entirely or greater part black. 
a. Aculeus as long as, or scarcely longer or shorter than, the 1st segment 
of the abdomen. 
x Seventh joint of the antennee longer than broad. 
* Abdomen black; only the 1st segment more or less red. 
+ Prothorax, petiole, and the segments, narrowly red-margined; the 
legs red, hind ones partly brown. 
Hemimachus instabilis, 14—2 lines. 
++ Thorax more or less red or brown, also the 1st segment; legs red 
and brown. - - - - - - 31. detritus, + line. 
** At least two of the abdominal segments red. 
Mesothorax red. 
Black; base of antenne, Ist two segments of abdomen, and legs, red. 
32. pedicularius, 2 lines. 
++ 
-_+ 
t Thorax entirely black. 
Antenne, Ist to 3rd segments of abdomen, and legs, red. 
33. cursitans, 2 lines. 
b. Aculeus shorter than the 1st segment. 
Black ; base of antenne, prothorax, mesothorax, Ist, 2nd, and base 
of 3rd segments of abdomen, and legs, red; hind femora 
brown. 
xx Seventh joint of antenne just as broad as long. 
34. vagans, 1—2 lines. 
Black; base of antenne, apex of all’the segments, and legs, red. 
30. spurius, ¢ line. 
b. Thorax entirely or greater part red. 
a. Aculeus as long, or about as long, as the Ist segmeut. 
* Ist segment of abdomen red. 
Black-brown ; base of antennee, thorax, and legs, dirty yellow. 
35. gracilis, 1 line. 
** Several of the segments of the abdomen red. 
+ Seventh joint of the antenne not, or hardly, longer than broad. 
Base of antenne, thorax, segments Ist to 3rd, and legs, red; hind 
femora brownish. - - aS lees 36. latrator, 1 line. 
}+ Seventh joint of antenne distinctly longer than broad. 
+ Abdomen red, with only one segment black. 
8rd segment black; legs red. = Hemimachus fasciatus, 13—2 lines. 
tt Ist to 3rd segments of abdomen red. 
‘Thorax without scutellum; Ist segment of abdomen with projecting 
spiracles; base of antenna, thorax, and legs, red. 
37. lepidus, 1 line. 
b. Aculeus longer or shorter than the Ist segment. 
x Aculeus decidedly shorter than the Ist segment. 
* Thorax, Ist segment, and greater part of legs, red. 
38. Stevenii, 2—2% lines. 
** Base of anteune, thorax, 1st four segments, aud greater part of legs, 
red. - - . . - - 39. canaliculatus, 14 line. 
x x Aculeus decidedly longer than the lst segment. 
Line on the metathorax faint. 
Base of antennee, thorax, 1st two or three segments, and legs, red. 
