298 



THE CANADIAN ENTOMOLOGIST. 



North American Species. 



AuLACOPHiLus, Smith. 

 Trypoxylon, Latreille. 



T. politum, Say. 

 =albitarse, Auct. 

 --neglectum, Kohl. 



T. albipilosum, Fox. 



T. excavatum, Say. 



T. projectum, Fox. 



T. apieah's, Fox. 



T. frigidum, Smith. 



T. bidentatum, Fox. 



T. rubricinctum, Pack. 



T. rufozonalis, Fox. 



T. arizonense, Fox. 



T. caHfornicum, Sauss. 



T. spinosum, Cam., 9 S 



T. texense, Sauss. 



T. colUnum, Smith. 



T. carinatum, Say. 



T. Johnsonii, Fox. 



T. ornatipes, Fox. 



T. fastigium, Fox. 



T. striatum, Prov. 



T. sulcus. La Munyon. 



T. unicolor, Beauv. 



T. centrale, Cam. 



T. cinereum, Cam. 



T. mexicanum, Sauss. 



T. aztecum, Sauss. 



T. lactitarse, Sauss. 



T. luteitarse, Sauss. 



T. carinifrons, Cam. 



T. fulvispina, Cam. 



T. fulvipes, Cam. 



T. balteatum, Cam , 



T. apicipenne. Cam. 



T. cinereo-hirtura, Cam., $ 



T. fasciventre, Cam., 9 • 



T. sonorense, Cam. 



T. cornigerum, Cam. 



T. chichimecum, Sauss. 



T. toltecum, Sauss. 



T. palliditarse, Cam. 



T. rugifrons, Cam. 



?. 



T. pennsylvanicum, Sauss. 



Family XXII.— Mellinidte. 



This family, as well as those which are to follow, is distinguished from 

 all of the preceding families l?j> Juiv'uig tzuo apical spurs on the tniddle 

 tibice. From the other families having this character in common, namely, 

 the Nyssonidfe, Stizida?, Sphegidfe, and Ampulicid?e, it could only be con- 

 fused with the family Nyssonidae, subfamily Gorytina?. 



Unquestionably, the Mellinidce and the Nyssonidoe have had a com- 

 mon origin and are exceedingly closely allied, but I believe both exhibit 

 certain structural peculiarities, of taxonomic value, that justify one in 

 keeping them separate and in treating them as distinct families. 



In the Mellinidre the first abdominal segment is usually long, petioli- 

 form, and coarctate, or always taith a decided constriction between the first 

 and second segments, the intermediate cox^ are contiguous,, while the 

 mesosternal suture is usually entirely wanting. In the Nyssonidte, on the 



