THE CANADIAN ENTOMOLOGIST 157 



Metoposarcophaga pachyproctosa, n. sp. 



Holotype (male). — Collection of R. R. Parker. 



Allotype (female). — Collection of R. R. Parker. 



This species is so close to M. pachyprocta that a repetition of the description 

 is unnecessary. So far as observed the only reliable differences between the 

 males of the two species are to be found in the characters of the genitalia as here 

 listed. 



M. pachyproctosa. 



1. Anterior clasper reversed S-shaped (Fig. 12). 



2. Penis distinctive, but with long, slender base (Fig. 12). 



3. Fifth ventral plate distinctive (Fig. 13). 



M. pachyprocta. 



1. Anterior clasper with broad expanded basai portion (Fig. 9). 



2. Penis distinctive, with short base \Fig. 10). 



3. Fifth ventral plate distinctive (Fig, 7). 



In addition the second genital segment of pachyproctosa is dull orange 

 throughout, and there is a narrow, posterior, dull orange band on the first seg- 

 ment, whereas in pachyprocta the second segment is more or less greyish pollinose 

 and the grey pollen of the first segment extends to the middle portion of the 

 posterior margin, at least. These characters may well be variable, however, 



I have three females collected in the same locality as the above males. 

 These females are not separable from those of pachyprocta, but this species has 

 never been found in several lots of materal from Savary Island. The females 

 are therefore assumed to be those of pachyproctosa. 



Described from two male and three female specimens. 



Range. — British Columbia; Savary Island, July 9, and Aug. 11, 1916. 

 July 11 and 12, 1917, (R. S. Sherman, collector). 



M. pachyprocta is known to occur in Mass., N. Y.,N.J., Pa., Va., N, C, 

 S, C, Ga., La., Ind., Ohio, Col., S. D., Calif., Manitoba, Cuba (?) and Hayti 

 (?): M. pachyproctosa and M. tothilli are known only from British Columbia: 

 M. incurva occurs in N. Mex., Mont., and British Columbia. 



Explanation of Figures. 



I. Profile view of genital segments of M. pachyprocta R. Parker and M. 

 pachyproctosa, n. sp. 



2. Profile \'iew of genital segments of M. incurva Aldrich and M. tothilli, 

 n. sp. 



3. Penis of M. tothilli. 



4. Claspers of M. tothilli. 



5. Forceps and accessory plate of M. tothilli. 



6. Fifth ventral plate of M. tothilli. 



7. Fifth ventral plate of M. pachyprocta. 



8. Forceps and accessory plate of M. pachyprocta. 



9. Claspers of M. pachyprocta. 

 10. Penis of M. pachyprocta. 



II. Forceps and accessory plate of M. pachyproctosa. 



12. Claspers and penis of M. pachyproctosa. 



13. Fifth ventral plate of M. pachyproctosa. 



