ART. 29 IMMATURE STAGES OF SARCOPHAGID FLIES GREENE 19 



cavity. Each spiracuiar plate is shining red, with three yellow 

 slits; inner and middle slit slightly convex to each other and of 

 about equal length ; outer slit straight and about two-thirds as long 

 as the middle one ; spiracuiar plates separated by a space about as 

 wide as one plate. Anal opening small, indistinct, located just below 

 the cavity. Anterior spiracles are missing in the specimens at hand. 



Length, 7-7.5 mm. ; diameter, 3 mm. 



One specimen without labels ; other specimen labeled " Sarcophaga 

 Xo. 25." Both specim.ens in collection of R. R. Parker. 



33. SARCOPHAGA BULLATA Parker 



Large, dull, dark red. Posterior cavity large, elliptical; located 

 centrallv on the horizontal axis; tubercles around the edge very 

 small; two posterior segments slightly visible; on each side and 

 below the posterior cavity is an area faintly depressed. Each 

 spiracuiar plate is shining black with three narrow yellow slits ; the 

 first slit is slightly sinuous; middle slits about parallel; spiracuiar 

 plates separated by a space about half the width of one plate. Anal 

 opening some distance from the edge of the cavity ; each side of the 

 anal opening is a conical tubercle; these tubercles are separated 

 by a space about twice the height of one tubercle. Anterior spiracles 

 arcuate, about tAvice as wide as high ; located at the apex each spiracle 

 has 20 small, yellow, lobes; spiracle reddish brown at the base. 



Length. 8 mm. ; diameter, 3 mm. 



Bethesda, Maryland, June 26, 1915; reared from meat by Max 

 Kisliuk: Hunter, No. 3281. 



34. SARCOPHAGA UTILIS Aldrich 



Large subshining, dark red; surface around the posterior cavity 

 shining with the edge of the cavity yellow. On the dorsum at the 

 posterior end is a depression with a broad ridge in the middle. 

 Pofa'terior cavity nearly round, located centrally on the horizontal 

 axis. Each spiracuiar plate is shining, deep reddish black, with 

 three yellow slits of nearly equal length; two inner slits parallel with 

 the outer or first slit bent slightly to the right near the base; 

 spiracuiar plates separated by a space equal to about two-thirds 

 the width of one plate. Anal opening small, fairly distinct, with a 

 rather weak tubercle on each side of the opening. Anterior spiracles 

 about as high as wide ; each spiracle has 2G small yellow lobes with 

 the lower part of the spiracle deep red. 



Length, 9 mm. ; diameter, 4 mm. 



Natrona, Pennsylvania, May 30, 189G. In collection of R. R. 

 Parker. 



