OF WASHINGTON, VOLUME XIX, 1917 155 



At the base of the first segment is a row of small, fleshy, bristle-like 

 projections; all the other segments have three rows each of similar pro- 

 jections. 



Between the large tubercles on the lateral edge (which are the ends of 

 the transverse rows) are numerous fleshy, bristle-like projections, which 

 are longer than those on the dorsum. 



The caudal or posterior spiracle is nearly cylindrical, mostly dull black 

 and shiny at the apex. On the apex are two small, circular, pit-like 

 openings. 



The mouth is a fleshy opening, of the suctorial type and retractile be- 

 tween two large, rounded, fleshy folds. 



The palpi are located just above the buccal opening and are retractile. 

 The base is whitish and nearly cylindrical and bifurcated at the apex; these 

 bifurcations are yellowish-brown and have a depression or groove on both 

 sides, giving this upper portion the appearance of two cylinders fused 

 together; the inner cylinder slightly shorter than the outer one. 



For details see drawing (fig. d). 



The entire ventral surface of the larva is covered with minute, brownish- 

 black spines. 



Larva is 7 mm. long in the body, posterior spiracle 1 mm. making a total 

 of 8 mm. in length and 3 mm. wide, being nearly cylindrical. 



Pupa (plate XIX, fig. 3). 



Pupation takes place in the larval skin. The puparium looks like the 

 larva except the characters noted. It is much smoother and the segmenta- 

 tion is hardly noticeable. All the fleshy, bristle-like projections are very 

 much compressed and shriveled. In profile, the puparium slopes from 

 about the middle of the second segment to the apex of the first, having a 

 wedge-shape appearance. On the dorsum of the first segment are four 

 short ridges, all meeting at the apex. Near the center of the transverse 

 ridge, in the middle of the second segment, are two conical spiracles, curved 

 outward; they are reddish-brown, slightly shiny at the apex, and have 

 numerous small tubercles, around the sides with one located at the apex. 



It is 7 mm. in length, 4.75 mm. in width and nearly cylindrical. The 

 adult emerges by pushing off the dorso, apical portion of the puparium 

 which breaks transversely across the segmental line. 



Pseudotephritis corticalis Loew. 

 MOM. X. A. Dipt. Ill, p. 136. 



These larvae were collected at Falls Church, Va., February 18, 

 1913 by Messrs. S. A, Kolnvrr and Win. Middleton, in frass, under 

 the bark of chestnut (Caxtanea denlata). 



Pupation took place in the larval skin, March 16, 1913 and the 

 adults emerged April Hi to 18, 1913. 



