226 THE ENTOMOLOGIST. 
Head, three bands on abdomen, apex of antenne, and apex of hind 
femora and tibiee, dark. : = - 7. zonatus, 12 line. 
oo Insect almost entirely black-brown. 
— lst segment of abdomen yellow. - - 8. timidus, } line. 
+--+ Ist segment of abdomen black brown. - - —nigritus, 1 line. 
If. Abdomen clothed with scattered hairs. 
a. Metathorax very short; insect piceous. 
** Mesothorax of ordinary length. - - - 9. pumilus, + line. 
*k Mesothorax as short as the metathorax. : - brevis, 2 lines. 
b. Metathorax of ordinary length. 
+ The fourth joint of antennse longer than the third. 
t Thorax red. 
Legs and base of abdomen red. - 10. Kiesenwetteri, 1{—2} lines. 
tt Thorax and abdomen black. 
§ Legs red; aculeus quite as long as Ist segment of abdomen. 
11. ecarinatus, 1 line. 
§§ All the femora and hind tibize more or less brown; aculeus at least 
one-fourth shorter than the lst segment. 12. forticornis, 1% line. 
++ The third joint of antennee as long as the fourth, or a little longer. 
Brown, legs yellow; 1st segment of abdomen and femora brownish 
yellow. - - - . - - 13. posthumus, 3 line. 
B. Metathorax with a more or less distinct transverse ridge, which 
separates the upper from the back or slanting part. 
I. The slanting part (or that portion below the transverse ridge) much 
shorter than the upper part. 
a. Abdomen clothed with dense pubescence. 
Black, legs red; thorax elongate. - - 14. nigricornis, 1% line. 
b. Pubescence on abdomen seattered, not dense. 
* Legs entirely red. 
Base of antenne, thorax, lst two and part of 3rd segments, red. 
15. bellicosus, 24 lines. 
«* Legs not entirely red, but more or less brown ; thorax red. 
+ Ist segment of abdomen red. - - 16. pulicarius, 2? lines. 
++ 1st two segments of abdomen red. - 17. acarorwm, 2} lines. 
II. The posterior or slanting part of the metathorax of ordinary length, 
or long. 
1. Pubescence on the abdomen dense, at least on the three 1st segments. 
a. Aculeus about as long as the Ist segment. 
* Spiracles on the 1st segment of the abdomen distinctly projecting. 
Antenne, thorax, Ist two and part of 3rd segments and legs, red. 
Hemimachus trua, 12 line. 
*& Spiracles on the lst segment not distinctly projecting. 
+ Abdomen, as well as thorax and legs, entirely red, or reddish yellow. 
t Head red, or reddish yellow. 
§ Head darker than the thorax.  - - - 19. carnifex, 14 line. 
§§ Head not darker than the thorax. - . 20. rufulus, 2 lines. 
tt Head black. 
x The Ist segment of the abdomen with slightly but distinctly project- 
ing spiracles ; the sheaths of the aculeus brown at the apex. 
21. ochraceus, 1% line, 
x x The Ist segment without projecting spiracles; sheaths of the aculeus 
entirely brown. - . : - 22. corruptor, 1% line. 
