278 THE CANADIAN ENTOMOLOGIST. 



lo. Antennte black, slightly thickened beyond the middle ; abdomen 

 polished; 2 dorsal carinse of petiole not reaching apex ; carinse on 

 metathorax indistinct, angles subspinose ; legs rufous ; coxae and 

 trochanters black ; abdomen red. Length 

 9 mm *PACiFicus, Harrington. 



Antennse red, in cJ black at apex, mtich thickened at apex ; 

 metathorax with distinct carinse ; face finely punctate ; petiole large 

 at apex. Length 5 mm *ruficornis, Provancher. 



12. Petiole broad at apex; scutellum entirely white ; generally no v/hite 

 between eyes and mandiblec, but a white line between antennae and 

 eyes, between pro- and mesothorax, and between pleura and 

 dorsum of mesothorax 14. 



Petiole slender, narrow at apex, not very rough, black ; apex red ; 

 following 3 joints abdomen red ; no white on thorax or face, except 

 between the eyes and the mandibles and the apex of scutellum; 

 flagellum rufous at base. Length of antennae 9 mm., of insect 

 8 mm Canadensis, Cresson. 



14. Dorsum of 3 basal abdominal segments piceous, rest of abdomen 



rufous ; face, mouth-parts, broad orbital lines, cheeks, neck, stripes 

 on mesonotum, most of pleura and sternum, large spot on meta- 

 pleura, apical spot on metathorax (but black in centre), petiole, 

 broad margin of remaining segments and parts of legs white ; 

 carince on metathorax prominent, spines long ; petiole scabrous, 

 with two distinct carinoe. Length 8 mm Foxi, Davis. 



Abdomen red, apical portion more or less dark ; only an anterior 

 orbital line, ring on antenna, scutellum and humeral lines white. 15. 



15. Abdomen long and narrowly oval; face uniformly and closely 



punctured, not polished ; anterior orbital line reduced to a mere 

 short stripe; antennae long, 6 mm.; basal joints of flagellum more 

 than twice as long as broad ; metathoracic carinte well marked ; 

 spines not prominent ; apex of petiole aciculated ; base of second 

 segment shagreened ; abdomen red ; base of petiole darkened. 

 Length 7-8 mm montanus, Cresson. 



Abdomen short and very broadly oval ; face sparingly punctured, 

 smooth and polished anteriorly and on clypeus ; white line in front 

 of eyes long and broad ; antennae short, 4 mm.; basal joint of 



