274 WILLIAM J. FOX. 



180. Ilutilla Tagaiis Fabr. 



Midilla vagntis Fahricins. Ent. Syst. Suppl., 282, ?, 1798. 



Boreal America. 



181. Uliitilla seciin«la D. T. 



Mutilla canadensis Provan(;her, Add. Hym. Quebec, 2.50, % , 1887. 

 Mutilla secimda Dalla Torre, Cat. Hym., viii, 84, % , 1897. 



Canada. This is not the same as Photopsis canadensis Provan- 

 cher, or Spheerophthalma canadensis Blake. It belongs to group 

 hexagona and may be a variety of that species. 



182. Mutilla coiitracta Say. 



Mutilla contmda Say, Bost. Joiir. N. H., i, 29.5, % , 1836. 



Arkansas and IMissouri. This is not the M. contracta Blake 

 which is identical with hexagona. I am inclined to regard con- 

 tracta Say as belonging to the series with tridentate mandibles, as, 

 judging from the description, it has a third submarginal cell similar 

 to the species of that series, notwithstanding that Say described the 

 eyes as emarginate. 



183. Mutilla tertia D. T. 



Photopsis canadensis Provancher, Add. Hym. Quebec, 410, % . 1888 (nee Blake). 

 Mutilla tertia Dalla Torre, Cat. Hym., viii, 91, % , 1897. 



Canada. This is not the same as Matilla canadensis Provancher. 



184. Mul^illa vigilans Say. 



Mutilla vigilans Say. 



This species is not identical with hexagona Say. See note under 

 M. hexagona. 



II. Subfamily Thynnin>e. 



The characters offered herein for the separation of the Mutillinse 

 and Thynniuffi have apparently never been used by previous writers 

 in defining the Mutillidse and Thynnidje, which have hitherto 

 been generally regarded as families. The use of these charac- 

 teristics necessitate the breaking down of old boundaries, so that 

 some genera are relegated thereby from one family, or subfanjily, 

 into the other. For instance, the divided thorax of female and 

 armature of tip of male abdomen remove Myrmosa, Methoca, Bra- 

 chycistis and Chyphotes from the Mutillidse (Mutillinse) into the 

 Thynnidce (Thyninnje), which gives the latter subfamily a strong 

 representation in our fauna. 



The Thyninnse of the United States are divisible into five genera 

 as follows : 



