ART. 29 IMMATURE STAGES OF SARCOPHAGID FLIES GREENE 23 



tubercles always appear to be worn off. Each spiracular plate is 

 located on a rounded, raised area ; these areas touch each other in the 

 center of the cavity; each plate is shining, reddish-yellow with a 

 broad, reddish-black, wide ring around the edge very narrowly 

 connected at the base ; each plate has three broad slits nearly parallel ; 

 the first or inner slit bent slightly, in the middle, toward the second 

 slit. Looking from the posterior end there is a large rounded, flat- 

 tened tubercle like those described above. There are two mouth 

 booklets; two small papillae on each side of head segment near the 

 apex; these papillae are hardly as long as their diameter. Anterior 

 spiracles deeper reddish brown with 19 small lobes to each. 



Length, 12-13 mm. ; diameter, 3-4 mm. 



Long Branch, New Jersey, March 29, 1910; William T. Davis, 

 collector. 



43. WOHLFAHRTIA VIGIL Walker 



Larva pale yellowish white, very robust; posterior end slightly 

 rounded, tapering to a point at the anterior end. There are 10 seg- 

 ments in addition to the head. First three segments slightly nar- 

 rower than the others. Chitinous spines minute confined to the 

 segmental lines, much more numerous on the anterior portion, where 

 the spines are arranged in very short, slightly arcuated lines or 

 groups. Anterior segments 2, 3, and 4 with large, rounded tubercles 

 arranged transversely; posterior cavity small, deep, with six small, 

 conical tubercles on the upper edge and with two on the lower edge. 

 Spiracular plates small, shining, deep reddish black, with three yel- 

 low slits; the two inner slits nearly parallel. Each side of the anal 

 opening is a large globular tubercle with the space between them 

 about equal to the diameter of one tubercle. Between these two 

 large tubercles is a very small tubercle. There are two mouth hook- 

 lets; two small papillae on each side of the head, brownish, the 

 upper one is larger and darker; their length is less than their 

 diameter. Anterior spiracles brownish, and each spiracle with nine 

 lobes. 



Length, 13 mm. ; diameter, 3.5 mm. 



Dunkirk, Montana, September 8, 1922; ^Y. Roy Walker, col- 

 lector. In back of Airedale puppy 6 days old. 



44. SARCOPHAGA PLACIDA Aldrich 



Larva yellowish white, slender, tapering to a point at the an- 

 terior end, somewhat truncate at the posterior end. There are 10 seg- 

 ments in addition to the head ; anterior segments 2, 3, and 4 slightly 

 narrower than the following segments, which are of about the 

 same width. Segments 1 to 9 each have a transverse row of small 

 conical tubercles: those of the first three segments a little more 



