82 DIPTERA OF NORTH AMERICA. [PART IV. 



wings (D. rara, defuncta). The subcostal cross-vein in all the 

 species known to me, is close by the tip of the auxiliary vein ; 

 the marginal cross-vein close by the tip of the first longitudinal 

 vein. The slenderness of the feet, the structure of the forceps of 

 the male, etc., remind one of Dicranomyia (compare the forceps 

 of B. maculata, figured by me in Stett. Ent. Z. 1854, Tab. I, fig. 

 3, and that of B. domestica in the present volume, Tab. Ill, fig. 

 5, ha). 



The genus Ehipidia (from fads, a fan) was established by 

 Meigen, in 1818, for the only European species at that time 

 known. A second European species, B. uniseriata, has been 

 only very recently (1864) described by Dr. Schiner. Among the 

 three North American species, one occurs also in Europe ; the 

 other is very like the European B. uniseriata, and the third 

 seems to be common to the United States and to Brazil. A 

 Bhipidia from Caffraria exists in the Berlin Museum. 



Table for the determination of the species. 



' Wings with spots and clouds scattered over the whole surface. 



1 maculata M. 

 Wings with some brown spots or clouds along the anterior margin 

 only. 2 



( Antennae black. 2 fidelis 0. S. 



\ Antennae with the two penultimate joints yellow. 3 domestica 0. S. 



Description of the species. 



1. R. maculata M. % and J . — Cinereo-fusca, thoracis vitta, brunnea, 

 alae maculis majoribus in margine antico, punctis et maculis minoribus 

 in cellulis omnibus, fuscis ; antennae maris bipectinatse. 



Grayish-brown, thorax with a brown stripe ; wings with larger brown spots 

 along the anterior margin and with smaller spots and dots in all the 

 cells ; antennae of the male bipectinate. Long. corp. 0.3 — 0.4. 



Syn. Ehipidia maculata Meigen, I, p. 153 ; Tab. V, fig. 9-11. — 0. Sacken, 

 Proe. Ac. Nat. Sc. Phil. 1859, p. 208. 



Front and vertex gray ; rostrum, palpi, and antennae black ; 

 joints of the flagellum (except the basal and the terminal ones) 

 bipectinate in the male ; in the female, these joints project dis- 

 tinctly on the under side. Thorax brownish, pruinose with gray 

 above ; a broad brown stripe in the middle ; lateral stripes some- 

 what indistinct ; halteres pale j feet tawny ; coxaa and base of the 



1-! 



