914 Charles Paul Alexander 



very different from those of Ula and closer to those of the subgenus 

 Lasiomastix in the genus Limnophila. 



Ulomorpha pilosella (0. S.) 



1859 Limno-phila pilosella O. S. Proc. Acad. Nat. Sci. Phila., p. 241. 

 1869 Ulomorpha pilosella O. S. Mon. Dipt. N. Amer., part 4, p. 233. 



Ulomorpha pilosella is a shiny, reddish brown fly, with the wings faintly 

 darkened. The sessile or subsessile cell 7^2 is a well-marked feature of 

 the venation (Plate XLI, 163). The insect is common in cold Canadian 

 woods thruout northeastern North America. 



Genus Adelphomyia Bergroth 



1891 Adelphomyia Bergr. Mittheil. Naturf. Ges. Bern, 1890, p. 134. 



The species of the genus Adelphomyia are among the smallest of the 

 Limnophilini. The immature stages of the American species are spent 

 in rich, saturated, organic earth in shady situations. There are two 

 European and three American species thus far described. Adelphomyia 

 cayuga and A. americana are commonest in late summer; A. minuta is a 

 species of late spring and early summer, fairly common in rich Canadian 

 woods, in gorges, and near wooded bogs. 



A recent study of the larval head in this genus shows a decided rela- 

 tionship with the tri])e Pediciini, and it seems probable that the genus will 

 have to be placed in that tribe despite the very limnophiline appearance 

 of the adults. 



The local species of Adelphomyia may be separated by the following key : 



1. Cell Ml of wings lacking; coloration of body dark brown; antennae with less than 16 seg- 



ments, the basal segments of the flagellum fused together. [Pomona Journ., vol. 4, 



p. 831, fig. B. 1912.] (Plate XLI, 162.) A. cayuga Alex. 



Cell Ml of wings present; coloration of body yellow or light yellowish brown; antennae 

 with the basal flagellar segments distinct 2 



2. Pubescence in cells of wings sparse; cross- vein r not evident; cross- vein 7n short or 



obliterated by fusion of Mi on Mi+-<; color of body light yellow. [Can. Ent., vol. 43, 



p. 287-288. 1911.] (Plate XLI, 161.) ' .4. minuta Alex. 



Pubescence in cells of wings conspicuous; cross-veins r and m usually distinct, the former 

 in some cases little evident; color of body yellowish brown. [Pomona Journ., vol. 4, 

 p. 829-830, fig. A. 1912. Ent. News, vol. 22, p. 353-354, fig. 4, as .4. senilis Hal. 

 of Europe. 1911.] (Plate XLI, 160.) A. americana Alex. 



Genus Epiphragma Osten Sacken 



1859 Epiphragma O. S. Proc. Acad. Nat. Sci. Phila., p. 238. 



