THE CANADIAN KNTOMOLOGlbT. 297 



? P. frontalis, Cr. A. scelestus, Cr. 



? P. xanthosligma, Cam., $ . A. dubius, Cr. 



? P. maculifrons. Cam., J. A. sublimis, Cr. 



? P. multimaculata, Cam., c^ . Philanthus, Fal)ricius. 



Anthophilus, Dahlbom. P. bilimatus, Cr. 



A. politus, Say. Trachypus, Klug. 



A. albifrons, Cr. T. mexicanus, Sauss. 



A. flavifrons, Cr. T. punctifrons. Cam., ^ . 



A. pacificus, Cr. T. hirticeps, Cam., ^ . 



A. albopilosus, Cr. T. gracilis, Cam., ^. 



Family XXI. — Trypoxylidae. 

 This family has usually been classified with the family Crabrofiida^ 

 with which it has no affinity whatever, its affinities being closest to the 

 Larridse, through Fison, and to the Philanthidte through Trachypus ; but 

 is readily separated from both by the characters made use of in my table 

 of families. 



Trypoxylon, the type of the family, was probably classified, by the 

 older entomologists, with the Crabronidw on account of its elongate, 

 narrow form, and its petiolate, clavate abdomen, which gives it a super- 

 ficial resemblance to the Crabronid genus Rhopahim. Structurally, 

 however, it has no relations whatever with this or allied genera, differing 

 widely in the structure of the head and in the venation of both pairs of 

 wings. 



Only two genera are known, separable as follows : 



Table of Genera. 

 Front wings with two cubital cells, the second usually indistinctly 

 defined ; eyes deeply emarginate within. 



Median and submedian cells in front wings of an equal length, 

 the transverse median nervure being interstitial with the basal 

 nervure ; first recurrent nervure interstitial with the first trans- 

 verse cubitus or nearly, the second recurrent received by the 



second cubital cell before the middle Aulacophilus, Smith. 



Median cell in front wings distinctly longer than the submedian, 

 the transverse median nervure joining the median vein before 

 the origin of the basal nervure ; first recurrent nervure uniting 

 with the cubitus before the first transverse cubitus ; second 

 recurrent nervure rarely distinctly defined, usually indicated by 

 a fuscous line or streak Trypoxylon, Latreille. 



