178 DIPTERA OF NORTH AMERICA. [PART IV. 



By all means the position of Goniomyia, as proved by its 

 characters, is on the extreme limit of the group of Eriopterina, 

 and this view is strengthened by the following circumstance : The 

 smallness of the first submarginal cell seems to foreshadow its 

 entire disappearance ; and indeed, I possess two specimens where 

 this disappearance actually takes place through the obliteration 

 of the branch of the second longitudinal vein. One of these 

 specimens resembles G. sulphurella very much ; it is barely 

 possible that it is an accidental abnormity 1 of a specimen of this 



1 While this volume was in press, I have found a second specimen of the 

 same kind, and have had the opportunity to examine it when it was still 

 alive. It is not an accidental abnormity, but a new species closely allied 

 to G. sulphurella. Although a new genus might be easily formed upon 

 this species, I prefer to leave it in the genus Goniomyia, until more species 

 of the same kind are made known. Thus Goniomyia will contain species 

 with two and with one submarginal cell, just as Limnophila contains species 

 with Jive and with four posterior cells. 



Goniomyia inanca, n. sp. % . — Flava, sulphureo maculata, hal- 

 teribus sulphureo-llavis ; alae cellula submarginali unica. 



Yellow, marked with sulphur yellow, halteres sulphur yellow ; wings with 

 a single submarginal cell. Long. corp. 0.2. 



Rostrum yellowish, palpi brown ; front brownish in the middle ; two 

 basal joints of the antennae yellowish, considerably infuscated ; the first 

 is small ; the second much larger than the first, rounded ; fiagellum black- 

 ish, slender, with long verticils (somewhat similar to those of G. sulphu- 

 rella), which give the fiagellum a feather-like appearance. Thorax yellow, 

 pale brownish above with faintly indicated stripes and a slight gray bloom ; 

 collare and upper part of the pleurse sulphur yellow ; the remainder of the 

 pleurae with a hoary bloom ; halteres with a sulphur yellow knob. Abdo- 

 men and male forceps yellow. Feet yellowish-tawny ; the tips of the 

 femora, tibiae, and tarsi hardly darker. Wings immaculate, with a slight 

 grayish tinge ; the venation is precisely like that of G. sulphurella (Tab. 

 II, fig. 2), except that the posterior branch of the second longitudinal vein 

 is obliterated ; thus the second longitudinal vein, shortly before its tip, 

 takes a sudden turn towards the anterior margin, in consequence of which 

 the submarginal cell is trumpet-shaped, that is, very considerably narrower 

 at its inner than at its outer end. The discal cell is closed. 



The forceps of the male (which I have examined on a living specimen) 

 belongs to the same type of structure as those of the other species of 

 Goniomyia, but the structure is more simple than that of the two species 

 the forceps of which I have figured (Tab. IV, fig. 17 and 18). There are 

 two lateral, elongated, subcylindrical (digitiform) lobes, converging, but 



