106 THE ENTOMOLOGIST. 



Division 2. — Back of metathorax not, or scarcely, concave. 



A. Abdomen black, or almost so; scape of antennae black beneath. 

 A. Hind femora red. 



a. Hind tibiae red, or apex fuscous ; rarely base also. 



* 3rd segment of abdomen with a chestnut spot at the side; 



aculeus one-third of abdomen (female). 44. lateralis, 2^ lines. 

 ** 3rd segment not red-marked, 

 f Aculeus about half of abdomen. 

 I Transverse anal nervure of hind wing geniculated. 

 § Metathoracic arese obsolete (female). - robusta, about 3 lines. 

 §§ Metathoracic areae distinct. 

 X 3rd segment of abdomen quadrate (female). 



22. difforviis, about 3 lines. 

 X X 3rd segment of abdomen transverse (female), ovata, about 3 lines. 

 II Transverse anal nervure not geniculated. 

 3rd segment of abdomen quadrate (male and female). 



27. erucator, about 3 lines. 

 00 3rd segment of abdomen transverse (male and female). 



cylindrica, If lines, 

 ff Aculeus not more than one-third of abdomen. 

 Metathorax very short. 

 ! Aculeus rather longer than Ist segment of abdomen (male and 

 female). . . . . Kriechbaumeri, 2^ — 3^ lines. 

 !! Aculeus shorter than 1st segment. - vulgaris, 3 — 3|- lines. 

 Iff Aculeus very short, hardly exserted. 



-i- Hind tibiae white at the base. - - ? in-ussica, 2 J lines. 



■i--t- Hind tibiae not white at the base. 



f-^ Front coxae yellow, base dark. - - - Brischkei, 3 lines. 

 <->■-->■ All the coxae black. .... 42. insectator, 2 lines. 



b. Apex and before the base of hind tibiae dark. 



* Hind tibiae white. 



f Coxae black, front ones more or less pale beneath at the apex. 

 I Margin of hind segments castaneous ; aculeus about one-third of 

 abdomen (female). - - - 73. viennensis, 2^ lines. 

 \\ Margin of hind segments black. 

 § 3rd segment of female transverse; aculeus one-third of abdomen. 



52. nana, 1^ line. 

 §§ 3rd segment of female not transverse ; aculeus rather less than 



half of abdomen. 

 X Hind femora entirely red. - 18. ceropliaga, 2i — 2| lines. 



X X Hind femora black at the base. - - '?11. arvensis, 2 — 2^ lines, 

 ff Front and part of middle coxae yellow. 



Aculeus about one-third or one-fourth of abdomen. 



67. tibialis, 2^ lines. 

 00 Aculeus about one-sixth of abdomen. 



1 Post-petiole quadrate ; supero-medial area transverse ; sides of 2nd 



and 3rd segments often more or less red. virginalis, 2f lines. 

 !! Post-petiole longer than wide; supero-medial area elongate. 



37. gracilis, If ^-2^ lines. 

 ** Hind tibiae reddish. 



