220 THE CANADIAN ENTOMOLOGIST. 



12-, in (^ 13-jointed ; the terminal joint in the latter com- 

 pressed, dilated ; the others normal . . Monisecera, Ashm., n. g. 



[Type C. abdominalis, Fox.] 

 Mesosternal suture distinct, extending to the middle coxae, and 

 distinctly separating the mesosternum. 



Head subquadrate or obtrapezoidal, wider than long, the 

 temples not especially broad : mandibles at apex in 2 

 truncate, blunt, in ,^ bidentate ; antenna; in $ 12-, in ^ 13- 

 jointed, the latter deformed, some of the joints emarginate 

 beneath ; metathorax coarsely rugose ; recurrent nervure in 

 front wings received by the cubital cell distinctly beyond the 

 middle; pygidium in p flat, triangular .. Podagritus, Spinola. 



[Type P. Gayi, Spin.] 

 4. Mesosternal suture wanting; mandibles in both sexes bidentate; 

 ocelli triangularly arranged. 



Metathorax smooth, the cordate area on the posterior face, more 

 or less distinctly defined; antennae in p 12-, in (^ i3Jointed, 

 the latter deformed, some of the flagellar joints depressed or 

 emarginate beneath ; recurrent nervure in front wings received 

 by the cubital cell far beyond the middle. . . .Rhopalum, Kirby. 



=Corynopus, Lep., et Br, 

 [Type R. tibiale, Fabr.] 

 Metathorax feebly punctate, the cordate area less distinct ; an- 

 tennae in p 12-, in (^ 13-jointed, the latter normal, none of the 

 joints emarginate ; recurrent nervure in front wings received by 

 the cubital cell at or near the middle. . Physoscelis, Lepel, et Br. 



[Type C. clavipes, Linne.] 

 [:=rufiventris, Panz.] 

 North American Species. 



(30) Dasyi'ROCtus, Lepeletier and (2) M. asperatus, Fox, (^ . 



Brulle. (36) Pt)DAGRiTUS, Spinola. 



(31) Synorhopalum, Ashniead. ? uncertain. 



(i) S. decorus, F'ox, p. (0 P- fulvohirtus. Cam. 



(32) Brachvmerus, Dahlbom. (2) P. maculitarsis, Cam. 



(33) Alliognathus, Ashmead. (3) P. jason. Cam. 

 (f) A. occidentalis, Fox, p (^ . (37) Rhopalum, Kirby. 



(34) Microcrabro, Saussure. (i) R pedicellatum. Pack., p ^. 



(35) Monia!cera, Ashmead. (2) rufigaster, Pack., ^ (^ . 

 (i) M. abdominalis, Fox, ^. 



