38 PROCEEDINGS OF THE NATIONAL MUSEUM Vol. 78 



types the pollen of the frons is yellow, not so deep golden as in 

 some specimens, but about as in the type of sternodontis. 



Sarcophaga chaetopygialis^ p. 366. 



Numerous specimens, of two species. I restrict the species to the 

 one described by me from a series of cotypes in the American Mu- 

 seum of Natural History ,^^ which is represented here also. It be- 

 longs to the Oxysarcodexia group, and is the only one of these known 

 which has hairs on the first vein, there are usually only two or three 

 of these hairs or setules. 



EXPLANATION OF PLATES 

 Plate 1 



Figure 1. 8. varia Walker, a, peni.s, from behind ; b, male genitalia, from side 



2. S. violenta Walker, a, genitalia, from side ; 6, forceps, from behind. 



3. S. auriflms Walker. Penis, from side. 



4. S. Mfrons Walker. Genitalia, from side. 



5. S. assidua Walker, o, genitalia, from side; 6, forceps, from be- 



hind ; c, tip of penis, from side ; d, fifth sternite. 



6. 8. perneta Walker. Genitalia, from side. 



7. 8. acanthoptera Van der Wulp. Genitalia, from side; and forceps, 



from behind. 



8. 8. stirrubea Van der Wulp. a, genitalia, from side; &, penis, from 



behind. 



9. /S. praerolans Van der Wulp. a, forceps, from behind ; h, hind tibia 



of male. 



10. 8. turhata Van der Wulp. o, genitalia, from side; b, forceps, from 



behind. 



11. 8. trivialis Van der Wulp. a, penis, from side; 6, forceps, from 



side; c, forceps, from behind. 



Plate 2 



12. 8. debilis Van der Wulp. a, genitalia, from side; 6, forceps, from 



behind. 



13. 8. deleta Van der Wulp. a, forceps, from behind; 6, penis, from 



side ; c, forceps, from side. 



14. S. ohcrrans Van der Wulp. a, terminal joint of penis, from behind ; 



6, genitalia, from side. 



15. 8. pexata Van der Wulp. a, genitalia, from side; 6, forceps, from 



behind. 



16. 8. volucris Van der Wulp. «, genitalia, from side; &, forceps, from 



behind, less magnified. 



17. S. aequata Van der Wulp. Genitalia, from side. 



18. 8. afficta Van der Wulp. o, genitalia, from side; &, forceps, from 



behind. 



19. /S. mieropyyuilis Williston. «, genitalia, from side; &, forceps, from 



behind. 



20. 8. otiosa Williston. a, genitalia, from side ; 6, forceps, from behind. 



"S Sarcophaga and Allies, 1916, p. 110, fig. 45. 



