-20 T 11 1-; CANADIAN ENTOMOLOGIST. 



3. Labrum extensible 8. 



Librum not extensible. 



Maxillary palpi wanting or rudimentary, or 3 -jointed 7. 



Maxillary palpi not rudimentary, 4- to 6-jointed ; labial palpi 

 4-jointed 4 



4. Maxillary palpi 4-jointed 5. 



Maxillary palpi 6-jointed. Labial palpi stout, the last three joints 



united scarcely as long as the first ; claws with a strong tooth 



beneath ; mandibles 3-dentate (3) Paragia Shuekard. 



(Type P. decipiens, Shuck.) 



5. First abdominal segment small ; clypeus in ^ transverse 6. 



First abdominal segment nearly as long as the second ; clypeus in $ 



longer than wide ; mandibles obliquely truncate, 3- or 4-den. 



tate (4) Paraceramius, Saussure- 



(Type P. spiricornis, Sauss.) 



6. Abdominal segments not constricted at base ; marginal cell with an 



appendage, the second cubital cell about twice as long as 



wide (5) Ceramius, Latreille. 



(Type C. Fonscolombei, Latr.) 



Abdominal segments constricted at base as in the genus Cerceris, 

 Latr.; marginal cell without an 



appendage (6) Ceramioides, Saussure. 



(Type C. cerceriformis, Sauss.) 



7. Second cubital cell subquadrate, not or scarcely longer than wide. 



Labial palpi 4-jointed ; labium long ; maxillary palpi rudimen- 

 tary, 3-jointed ; mandibles rather short and acute : claws 



unidentate (7) Jujurtha, Saussure. 



(Type Celonites oraniensis, Lepel.) 



Labial palpi 3-jointed ; labium short, bifid; maxillary palpi 

 wanting ; mandibles somewhat acute at apex ; claws 



simple (8) Trimeria, Saussure. 



(Type T. Americana, Sauss.) 



8. Marginal cell with an appendage 10. 



Marginal cell without an appendage. 



Eyes in £ normal, the lateral ocelli away from the eye margin . . 9. 

 Eyes in ^ abnormal, very strongly converging above or holoptic, 

 the lateral ocelli touching the eye margin ( 9 unknown). 



