224 THE CANADIAN ENTOMOLOGIST. 



cubitus, or the second recurrent interstitial with the second 

 transverse cubitus ; inner spur of hind tibise dilated ; metathorax 

 with a median sulcus, the area at base striate or alveolate ; 

 petiole of abdomen long, usually furrowed laterally ; clypeus 

 convex or subconvex, separated, anteriorly more or less rounded, 

 and with a slight vein, but without a median sinus ; labrum 



hidden Mimesa, Shuckard. 



=Aporia, Wesm. 

 [Type M. equestris, Lind.] 

 Second and third cubital cells each receiving a recurrent nervure, 

 or the first recurrent nervure is interstitial with the first transverse 

 cubitus ; head with a spine between the antennse; clypeus ante- 

 riorly rimmed, and with a median 



sinus , Dahlbomia, Wissmann. 



--Mesopora, Wesmael. 



=Psen, Kohl. 



[Type Sphex atra, Panz.] 



2. Submedian cell in front wings a little shorter than the median, the 



transverse median nervure being not quite interstitial with the basal 



nervure ; second cubital cell usually much narrower above. 



Second and third cubital cells each receiving a recurrent nervure, 



rarely with the first recurrent nervure interstitial with the first 



transverse cubitus Psen, Latreille. 



=Psenulus, Kohl pars. 

 [Type P. atratus, Panz.] 

 Second cubital cell receiving both recurrent nerv- 



ures Psenulus, Kohl. 



[Type M. fuscipennis, Dahlb.J 

 North American Species, 

 (ii )MiMESA, Shuckard. (9) M. basirufa. Pack., ? ^ . 



(i) M. chalcifrons, Pack., 9. (10) M. cylindricus, Fox., J (^ . 



(2) M. argentifrons, Cross., ? ^. (ri) M. regularis. Fox, 9. 



(3) M. Cressonii, Pack., 9 ^. (12) M. niger. Pack., 9 S- 



(4) M. borealis. Smith, ^ ^. (13) M. mixta, Fox, 9 cj  



(5) M. clypeata, Fox, 9 J^ . (14) M. leucopus, Pack., 9 ^. 



(6) M. pauper. Pack., 9 ^ . (15) M. cingulata, Pack. ^. 



(7) M. unicincta, Cress., 9 (J. (16) M. granulosus. Fox,, ,:^. 



(8) M. proxima, Cress., 9 . (17) M. gregaria. Fox, ;t . 



