351 



The larva and pupa of this species have previously been described 

 by Johnson* and by Feltf, the latter donating an imago and pupal 

 exuvium of lugens to the collection of the Laboratory. 



Originally described from Illinois, lugens has subsequently been 

 recorded from Riverton, N. J. ; and from Pennsylvania, New Hamp- 

 shire, and New York. 



Xylophagus abdominaus Loew 



Xylophagus abdominalis Loew, Berl. Ent. Zeitschr., 1869, p. 163. 



Larva. — Length, 16-21 mm. Differs from larva of lugens as 

 follows : the longitudinal pale streak on second thoracic segment sim- 

 ple, not Y-shaped ; third thoracic segment with conspicuous, brown, 

 chitinized dorsal patches (PI. L, Figs. 10, 11 ) ; thoracic and abdominal 

 hairs much weaker and paler. 



Pupa. — Length, 14 mm. Differs from pupa of lugens as follows : 

 antennal sheath without basal thorn (PI. L, Fig. 7); ventral aspect 

 of head and mouth-parts as in same figure ; dorsum of head with about 

 12 long hairs on each side of disc; thoracic spiracles less elevated; 

 npical segment of abdomen with the bifid process shorter and stouter. 



The examples used for the above descriptions were supplied by 

 C. W. Johnson and were found under the bark of a decaying pine-tree 

 at Riverton, N. J. 



The species was originally described from Texas, and has not been 

 recorded from any locality except Riverton as far as I am aware. 



Family COBNOMYIWAB 



Only two genera and three species are considered as belonging to 

 this family in North America, but if the catalogues are to be credited 

 one of these, Coenomyia pallida Say, has been described by various 

 authors under sixteen or more different specific names. In Aldrich's 

 "Catalogue of North American Diptera" the name accepted for our 

 species is fcrruginea Scopoli. I have some doubt about the identity 

 of our species with that of Europe, as Beling's description of the larva 

 of ferruginea does not fit that before me, and I use Say's name for 

 the species in this paper. The differences are noted on a subsequent 

 page. 



*Ent. News, Vol. 14, 1903, p. 23. 



IBull. 155, N. Y. State Mus., p. 121. (1912) 



