154 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



Pupa (fig. 2). 



Same general shape as the larva, but more cylindrical and smooth. It 

 is dark yellowish-brown and sparsely covered with a short, yellow pubes- 

 cence. They average 11 mm. in length and 4.3 mm. in diameter. 



On the dorsum near the apex are two very small tubercular, dark-brown, 

 chitinous spiracles. Behind this pair is another much larger pair with the 

 apical portion bent back. They are more yellowish than the pupa skin, 

 and slightly shiny. 



From the dorsal aspect, this spiracle has seven small, raised, pad-like 

 areas which are evanescent on the ventral portion. These areas and the 

 ventral side are covered with minute tubercles. (See fig. c.) 



The tail is bent along the side of the body or up over the dorsum. The 

 chitinous tip of the third section protrudes from the tip of the first. 



Brachyopa vacua O. S. 

 Bull. Buff. Soc. Nat. Hist., Ill, p. 68. 



The larvae were collected at Falls Church, Va., November 30 to 

 December 2, 1912, by the writer. They were found under dead 

 bark (Liriodendron) in the juice of decaying fungi. Some of the 

 larvae were brown and some black. The juice of the fungi was 

 brown in some places and black in others and the larva was of 

 the same color as the juice in which it was found. A larva of 

 each color was isolated and the result was a d" in each case. 



Exact time of pupation not known. All the adults emerged 

 during the night, from April 5 to 14, 1913. 



Larva 1 



Larva. Opaque, dull, light yellow-ochre with the entire body finely 

 rugose. First segment somewhat pointed. Larva reaches its greatest 

 width at the fourth segment and gradually decreases in width towards the 

 caudal end. The dorsum is very rugose transversely; in the middle of each 

 segment is a transverse depression or groove. On the lateral edge, near the 

 apex of the first segment, is a small spiracle. It is conical in shape, of a 

 dark reddish-brown color and of a chitinous texture. On the dorsum of the 

 first segment are six faint, longitudinal ridges reaching almost to the apex, 

 also a transverse row of six fleshy tubercles near its base and all the oth&r 

 segments have a row of 8 or 10 similar tubercles, just above the center. Two 

 or three tubercles on each end of each transverse row, terminate into three 

 or four fleshy, bristle-like projections; while the other tubercles terminal 

 into two such projections. 



At the base of the first, and the base and apex of all the other segments 

 is a row of short, fleshy, bristle-like projections. 



1 The larva and pupa look so much alike, that only the pupa was drawn. 



