48 INSECUTOR INSCITI/E MENSTRUUS 



covered with rather long, fine, brown hairs ; marginal bristles yellowish- 

 brown ; pleurae glossy black ; scutellum of good size, its posterior margin 

 rounded, and the disk slightly flattened ; numerous discal hairs and at least 

 two, generally four, post-marginal bristles present ; squamae brown. Ab- 

 domen black, glossy, broadly ovate, the segments subequal; numerous 

 surface hairs present, those on last segment rather conspicuous, whitish ; 

 length of abdomen about equal to that of thorax ; hypopygium rather 

 large, on the left side with a protruding, rather globular, ventral append- 

 age. Legs black, knees, apices of fore and mid tibiae, and entire tarsi 

 yellowish or reddish ; surface hairs on legs pale and very short. Wings 

 grayish, more or less smoky along the fore margin ; second costal division 

 barely longer than the first and twice as long as third ; veins 3 and 4 

 subparallel, slightly divergent at extreme apices, fourth ending very little 

 beyond apex of wing ; outer cross vein oblique, last section of fifth about 

 twice as long as penultimate section of fourth. Halteres brown, knob 

 black-brown, shining. 



Length, 1.5-2 mm. 



Type: Cat. No. 15654, U. S. Nat. Mus. 



Type locality : Washington, D. C, from birds' nests February 2, 1913 

 (R. C. Shannon). 



The female is identical with the male in every respect except the 

 hypopygium. Fifteen specimens representing both sexes. 



The type series is identical in every respect with four specimens from 

 River View, Md., which were reared from egg cocoon of a spider, 

 August 25, 1895. These specimens were recorded by Coquillett as 

 Siphonella oscinina Fallen, in Bull. 10, n. ser., Bur. Ent., 1898, p. 75. 



THE LARVA OF TRICHOSTIBAS PARVULA 



(Lepidoptera, Yponomentida) 

 By HARRISON G. DYAR 



The curious basket-like, stemmed cocoon of T. parvula H. Edwards 

 has long been known, but the larva has escaped observation. 1 found 

 the cocoons on the base of a large bay tree in Florida many years ago, 

 but never met with the larva. Recently, however, larvae have appeared 

 in numbers, and I have received a box of living ones from Mr. J. R. 

 Watson, who obtained them from a correspondent in Sea Breeze, Florida, 



