GONIOMYIA. 119 



species ; the specimen is too imperfectly preserved to allow a 

 close comparison. The other specimen, however, belongs to a 

 species which is manifestly distinct from all known Goniomyix, 

 but which, at the same time, shows the characters of this genus 

 in a most striking manner ; the venation (except the absence 

 of the first submarginal cell) resembles that of G. sulphurella, 

 but the auxiliary vein is much shorter ; the marginal cross-vein 

 is absent ; the discal cell is open and coalesces with the third 

 posterior cell ; the costa has a remarkable whitish tinge ; other- 

 wise the coloring and the general appearance of the insect are 

 those of Goniomyia. The structure of the male forceps would 

 be decisive as to the relationship of this species ; but the speci- 

 men is a female. 



The name of this genus occurs for the first time in Meigen, 

 Yol. I, p. 146, as Gonomyia. Megerle sent him L. tenella 

 under that generic denomination, which, however, Meigen did 

 not adopt. It was revived afterwards by Mr. Stephens in his 

 Catalogue, etc. (1822), and by Mr. Curtis in his Guide (1837), in 

 connection with the same species, but without any definition. I 

 have defined the genus in the Proc. Acad. Nat. Sci. Philad. 1859, 

 p. 229, and described the four North American species belonging 

 to it. In 1864 Dr. Schiner (Fauna Austriaca, Dipt. Yol. II, p. 

 543) gave this genus a wider definition by admitting in it some 

 species which, according to my opinion, it is better to separate, 

 and which now form the genus Empeda. 



As the name of this genus is probably derived from yavla, angle, 

 in allusion to the shape of the fork of the second longitudinal 

 vein, I propose to amend it in Goniomyia, 



Table for the determination of the species. 



x ( Wings spotted. 4 blanda 0. S. 



\ Wings not spotted. 2 



not lapping over each other in repose ; immediately above and parallel to 

 them is a single, long, horny style, the tip of which reaches beyond the 

 tip of the lobes ; below the lobes, some small, black, horny organs are 

 perceptible. 



Hub. South Orange, N. J., June 30, 1868 ; a single specimen. 



The first longitudinal vein in my specimen comes to an abrupt termina- 

 tion before reaching the costa. 



