22 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 6C 



40. SARCOPHAGA PLACIDA Aldrich 



Medium sized, dull, very dark red. Posterior cavity medium 

 sized, slightly elliptical, located centrally on the horizontal axis ; one 

 tubercle on each side of the cavity slightly above the horizontal axis. 

 Each spiracular plate is subshining black with three narrow yellow 

 slits; middle slit straight, all three slits converging very slightly to- 

 ward their bases ; spiracular plates separated by a space nearly equal 

 to the width of one plate. Anal opening small, depressed with a 

 large rounded tubercle each side. Anterior spiracles at anterior end 

 of puparium; each spiracle has 16 small, yellow lobes; basal portion 

 dull, reddish black. 



Length, 8 mm. ; diameter, 3.25 nam. 



Ancon, Canal Zone, September 12, 1923. Reared from Murex; J. 

 Zetek, collector; " Z. No. 2305." 



41. SARCOPHAGA FROGGATTI Taylor 



Large, dull, very dark red. Posterior cavity small, elliptical, 

 deep, located centrally on the horizontal axis ; tubercles distinct ; two 

 pairs above the central line and one pair below: from the posterior 

 cavity to the anal opening is a broadly rounded ridge with a 

 tubercle on each side of the anal opening which is distinctly de- 

 pressed. Each spiracular plate is shining, reddish black, with three 

 yellow slits; the lower end of the outer slit is bent in toward the 

 middle slit; spiracular plates separated by a space equal to about 

 two-thirds the width of one plate. Anterior spiracles with 15 small, 

 rounded, yellow lobes; the basal portion of the spiracle is deep red. 



Length, 9-10 mm. ; diameter, 3.5 mm. 



Townsville, North Queensland; G. F. Hill, collector; 1506. Ir 

 national collection and one specimen in collection of E. R. Parker. 



DESCRIPTIONS OF THE LARVAE 

 42. SARCOPHAGA CISTUDINIS Aldrich 



Larva pale ocher yellow, tapering slightly toward each end. There 

 are 10 segments in addition to the head. First three segments nar- 

 row and of equal width; other segments wider and of equal width. 

 Numerous very thick, short, pointed reddish-brown spines not con- 

 fined to the segmental line but also in various other areas. Posterior 

 cavity shallow, transversely elliptical; the edges around this cavity 

 have very delicate, chitinous, sharp-pointed spines arranged in very 

 short rows like the teeth of a comb; these little rows of teeth are 

 shorter above and below the central area of the cavity. The tuber- 

 cles around the posterior cavity are round, flat and appear to be 

 made up of rounded plates located one on top of the other: these 



