G. C. DAVIS. ■ 331 



TRYPHONIN^ NOT REGULARLY CLASSIFIED. 



1. Abdomen black, segments 2-4 with red dorsal spots, other segments slightly 



margined witli yellow; all coste and trochanters yellow: hind tibise 



white, black at tip Tryphon dcM-salis Prov. 



Markings not as above 2. 



2. Areolet present 3. 



Areolet wanting 19. 



3. Abdomen black, or with pale apical margins 4. 



Abdomen partly or entirely rufous 10. 



4. Antennae with pale annulus: legs black- . .Polyblastus annulicornis I'rov. 

 Antennse without pale annulus 5. 



5. Areolet m(;omplete; scutelluiii deeply excavated at base and with lateral 



carina ; cosiB and tarsi black Mesolelus niger Prov. 



Areolet co)uplete 6. 



6. Posterior tibise with small white annulus: femora and coxse red. 



Tryphon (Pyrachmon) annulatum Prov. 

 Posterior tibiae not annulate with white. • • • 7. 



7. Hind legs black beyond middle of femora- . - .Mesoleptus ang-ustus Prov. 

 Hind tibiae rufous, or dusky at apex 8. 



8. Scutellums yellow Mesoleius chicoutimiensis Prov. 



Scutellums black 9. 



9. Legs mostly rufous; clypeus rufous; antenupe black. 



Mesoleius dufresnei Prov. 



Legs dusky, femora and base of tibife pale; antennse yellow at base: clypeus 



black Tryphon quebecensis Prov. 



10. Thorax and abdomen ferruginous; legs yellow. 



Mesoleius (Pyrachmon) rufum. 

 Thorax black 11. 



11. Abdomen black at base 12. 



Abdomen not black at base Iti. 



12. Base and apex of abdomen black 13. 



Base only black 14. 



13. Two basal segments aciculate ; areolet small. 



Tryphon (Mesoleptus) largus. 

 Two basal segments not aciculate ; areolet large 15. 



14. Hind femora yellow, their tarsi dusky. 



Mesoleius (Mesochorus) truncatus. 

 Hind femora dusky ; all the tarsi white, black at exti'emity. 



Mesoleptus rufomixtus Prov. 



15. Mesonotum and scutellum black Mesoleptus Interruptus Prov. 



Mesonotum and scutellum red Mesoleptus lucens Prov. 



16. Scutellum black 17. 



Scutellum not black 18. 



17. Legs rufous, coxae black Tryphon hervieuxii Prov. 



Legs rufous; coxse rufous, four anterior ones and all trochanters white. 



Mesoleptus (Mesostenus) alblfacies Prov. 



18. Scutellum and antennae red Mesoleptus laurentianus Prov. 



Scutellum white; hind legs black, white annulus on tibite. 



Tryphon clapini Prov. 



TRANS. AM. ENT. SOC. XXIV. DECEMBER, 1897. 



