THE CANADIAN ENTOMOLOGIST. 291 



Sapygidee, Myrmosidre and Mutillidae ; they also agree with the three last- 

 mentioned families in habits, since species of Trigonalys have been bred 

 from the nests of wasps (Vespa and Polistes). It is probable also that, 

 like the Mutillidae, they will be found to live parasitically in the nests of 

 some of the bees. 



Table of Genera. 



i. Second cubital cell triangular or petiolate, the first recurrent nervure 



not interstitial, joining the cubitus before the first transverse cubitus; 



anterior margin of clypeus truncate or slightly rounded, never 



emarginate ; second ventral segment in <$ normal 2. 



Second cubital cell not petiolate, the first recurrent nervure interstitial 

 with the first transverse cubitus ; second recurrent nervure joining 

 the third cubital cell at or a little before the middle ; anterior margin 

 of clypeus more or less emarginate medially ; second ventral 

 segment in J produced at apex medially into a tooth or proc- 

 ess (1) Lycogaster, Shuckard. 



(Type L. pullatus, Shuck.) 



2. Front wings with three cubital cells, the marginal cell not attaining the 



apex of the wing 3. 



Front wings with four cubital cells, the marginal cell attaining the apex 

 of the wing. 



Legs not short, rather slender, not robust, the tarsi slender, the 

 basal joint elongate, joints 2-4 much longer than wide ; 

 antennae more than 16-jointed, tapering off toward 



tips (2) Trigonalys, Westwood. 



(Type T. melanoleucus, Westw.) 



Legs short, robust, the tarsi stout, the first joint hardly thrice as 

 long as thick ; joints 2-4 transverse; antennas 16- 

 jointed (3) Nomadina, Westwood. 



(Type N. Smithii, Westw.) 



3. Second cubital cell receiving the second recurrent 



nervure (4) Liaba, Cameron. 



(Type L. balteata, Cam.) 



