224 THE ENTOMOLOGIST. 



x Forehead with a vertical ridge above the antennae. 



perspicuum, 5 — 6 lines, 

 x x Forehead without a vertical ridge, or with a very slight one. 



Exterior discoidal recurrent nervure interstitial. 

 -+■ Antennae black, scape with whitish spot beneath. 



Base, apex, and back of 2nd segment of abdomen black. 



8. Jibulator, 7 — 8 lines. 



-+■-*• Antennae rufo-fulvous ; abdomen red, with a black line on 2nd 



segment. ------ 3. mirabUe, 14 lines. 



oo Exterior discoidal recurrent nervure not interstitial. 

 «-■» Face yellow ; hind femora black, or base and apex red. 



6. cerinops, 5 — 9 lines. 



*-++•■* Face of male yellow, female sometimes yellow-marked ; base of hind 



femora black. ----- 13. latro, 6 — 9 lines. 



§§ Scutellum depressed, margins very much raised. 



Agryp. canaUculatum, 4 — 5 lines. 



b. Posterior discoidal recurrent nervure interrupted by anal nervure 



above the middle. 



* Transverse anal nervure divided by a more or less distinct emitting 



nervure. 

 f Hind tarsi not thickened ; thorax black. 



1 Exterior discoidal recurrent nervure interstitial. 



§ Antennas about half the length of the insect. 9. perspicillator, 5 lines. 

 §§ Antennae three-fourths the length of the insect. 



cylindricum, 7 — 8 lines. 

 H Exterior discoidal recurrent nervure not interstitial. 



10. tenuitarsum, 5 lines. 

 |f Hind tarsi thickened. 

 x Exterior discoidal recurrent nervure interstitial. 



7. melanobatum, 6 — 6-J lines. 

 x x Exterior discoidal recurrent nervure not interstitial. 



12. clandestinum, 3 — 4i lines. 

 ** Transverse anal nervure not divided. 

 o Hind coxae red. 

 -+■ Vertex black. 



ft Breast yellow, or yellow-marked; 1st to 3rd segments of abdomen 



reddish chestnut, with bases black. - 11. interruption, 6f lines. 



i-n-f Breast not yellow-marked ; back and sides of apex of abdomen black. 



anxium, 4% — 5£ lines. 

 _i__}- Vertex with yellow spots ; thorax of female greater part red; apex 

 of abdomen slightly fuscous. arquatum, 3-J — 5i lines, 



oo Hind coxae black. 

 un Aculeus about as long as the 1st segment of abdomen. 



minutum, about 2J lines. 

 unun Aculeus about half the length of the 1st segment. 



! Exterior discoidal recurrent nervure almost interstitial. 



septentrionale, 3 lines. 

 !! Exterior discoidal recurrent nervure not interstitial. 



* Hind tibiae red, apex dark. - Agryp. flaveolatum, Si — 6 lines. 

 ** Hind tibiae black, towards the base red. - anomelas, 4 — 5 lines. 



c. Posterior discoidal recurrent nervure not interrupted. 



geniculatum, 3 lines. 



