24 PROCEEDINGS OF THE NATIONAL MUSEUM vol. GG 



rounded. Spines minute, pale yellow, and confined to the segmental 

 lines. Posterior cavitj' deep, large, elliptical. On the edge of the 

 upper half of the cavity is one very large conical tubercle on each 

 side; above, between these, are two pairs of much smaller tubercles; 

 on the lower half of the cavity are two pairs of small tubercles, with 

 a smaller pair located centralW between them. Spiracular plate 

 small, with three broad short slits ; the chitinous edge is dark brown, 

 very broad, extending down in a pointed fashion between the slits; 

 the lower end of the inner edge of the plate has a deep notch, and 

 the chitin here is more blackish. Each side of the anal opening is 

 a large conical tubercle ; these tubercles are widely separated. There 

 are two mouth booklets; two small papillae on each side of the head, 

 very pale, of about equal size, their length less than their diameter. 

 Anterior spiracles brownish yellow; each spiracle has 16 small lobes. 



Length, 11 mm.; diameter, 2.5 mm. 



Ancon, Canal Zone, September 12, 1923; in Murex. J. Zetek, col- 

 lector; "ZNo. 2305." 



45. SARCOPHAGA BULLATA Parker 



Larva pale 3'elowish-white tapering to a point at the anterior end. 

 There are 10 segments in addition to the head. All segments are 

 nearly equal in length ; chitinous spines are very minute, light colored 

 and confined to the segmental lines. Posterior cavity large, deep, 

 elliptical. On the upper edge of the posterior cavity are three 

 pairs of conical tubercles; the outer tubercle is slightly larger than 

 the inner ones; the lower edge has three pairs of tubercles with the 

 middle pair slightly smaller and located slightly below the line of the 

 other tubercles. Spiracular plates large, faintly brownish yellow 

 toward the apex; spiracular plates separated by a space about half 

 as wide as the width of one plate. Each plate has three fairly wide, 

 long yellow slits; darkened edge of the plate very narrow% widened 

 on the lower inner edge. Below the posterior cavity the anal tuber- 

 cles are nearly transverse. Anterior spiracles are browmish yellow; 

 each spiracle has 20 small lobes. 



Length, 12-13 mm.; diameter, 2.5 mm. 



Washington, District of Columbia, May 31, 1923; H. E. Ewing, 

 collector. Reared from beef liver. 



46. SARCOPHAGA SECURIFERA Villeneuve 



Larva is pale yellowish white, tapering gradually to a point at 

 the anterior end. There are 10 segments of about equal width in 

 addition to the head. The very minute chitinous points are princi- 

 pally along the segmental lines, but there are small similar areas 

 between these lines; the posterior end is pretty well covered with 



