SARCOPHAGA AND ALLIES 89 



As in this small series of forms there is consider- 

 able variation in the group characters, especiallj?^ in 

 the numljer of ps dc and the color of the hypopygium, 

 I give a table for the separation of all the species that 

 have been reared from Sarracenia. 



Table of Sarcophagas reared from Sarracenia. 

 Males only. 



1. Hind tibia with long, erect villosity 



sarraceniae Riley. 

 Hind tibia without villosity 2. 



2. Scutellum with a small pair of decussate 



(crossed) bristles at the apex. 3. 



Scutellum without such bristles, or if rather 

 coarse hairs are present they are divergent. 



fletcheri n. sp. 



3. Middle femur with a short comb of stubby, thick- 



ened bristles on hind lower edge near tip; 

 palpi black 4. 



Middle femur with only ordinary bristles in this 

 series; palpi yellow apically 



utilis Aid., var. 



4. Penis with deep, cup-like concavity in front, in 



which no copulatory tube is visible 



rileyi n. sp. 

 Penis with obvious copulatory tube projecting 

 from front side 5. 



5. Free part of accessory plate long, finger-like, 



divergent celarata n. sp. 



Free part of accessory plate flat but somewhat 

 slender jonesi n. sp. 



No. 33. Sarcophag-a tetra n, sp. 



Male. So nearly like sarraceniae that it will 

 suffice to point out the differences. Front narrower, 

 .159 of head; three distinct ps dc, the anterior large 

 and well spaced with the others ; first segment of hypo- 

 pygium black, with small bristles at apex ; forceps not 

 so heavy in profile and not toothed on front edge; 

 penis seemingly more oi)ened out to the front; both 



