ART. 29 IMMATURE STAGES OF SAECOPHAGID FLIES — GREEXE 25 



these small points. The three anterior segments each have a trans- 

 verse row of rounded tubercles; on segments 3 to 9 there is a small 

 granular tubercle on the lower lateral portion. Posterior cavity 

 large, deep, elliptical, with three pairs of conical tubercles of equal 

 size on the edge of the upper half; on the edge of the lower half 

 are three pairs of tubercles with the middle pair smaller. Spiracular 

 plates large, dark yelowish brown, with the edge much darker; on 

 the lower portion of the inner edge the chitin is wider and there 

 is also a notch on the side. Each plate has three broad slits con- 

 verging at the base. Anal tubercles robust, conical, and widely 

 separated; edge of anal opening yellowish brown. There are two 

 mouth hooklets: two small, brownish papillae on each side of the 

 head just barely elevated. 



Length, 14-15 mm.; diameter, 3 mm. 



Washington, District of Columbia, June 8, 1923; H. E. Ewing, col- 

 lector. Reared from beef liver. 



EXPLANATION OF PLATES 



(Drawings by C. T. Greene) 



Pi-ate 1 



Fig. 3. Sarcophar/a ctstudinis Aldrich. 



2. Sarcophaga commums, var. ochracea Aldricli. 



3. Sarcophofja communis Parker. 



4. Sarcopliana securifera Villeneuve. 



5. Sarcophaga cooleyi Parker. 



Plate 2 



Fig. 6. Agria afflnis Fallen. 



7. Sarcophaga eleodes Aldricli. 



8. Sarcophaga opifera Coquillett. 



9. Sarcophaga subaenescens Aldrich. 

 10. Sarcophaga hunteri Hough. 



Plate 3 



Fig. 11. Sarcophaga atlanis Aldrich. 



12. Sarcophaga fuscicauda Bottcher. 



13. Sarcophaga sternodontis Townsend. 



14. Sarcophaga anstralis Aldrich. 



15. Sarcophaga sarracenioides Aldrich. 



Plate 4 



Fig. 16. Wohlfahrtia vigil Walker. 



17. Sarcophaga aculeata Aldrich. 



18. Spirobolomyia singularis Aldrich. 



19. Sarcophaga haemorrhoidalis Fallen. 



20. Chaetorav!))ia quadrisetosa Coquillett. 



