82 DIPTERA OF XORTH AMERICA. [PART IV. 



wings {D. o-ara, defuncta). The subcostal cross-vciu 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 72. maculata, figured by me in Stett. Ent. Z. 1854, Tab. I, fig. 

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

 5, 5 a). 



The genus Rhipidia (from ^mli, a fan) was established by 

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

 known. A second European species, R. 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 vei'y like the European R. uniseriata, and the third 

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

 Rhipidia from Caflfraria exists in the Berlin Museum. 



Table for the determination of the species. 



[ Wings witli spots and clouds scattered over the wbole surface. 

 1 1 maculata M. 



j Wings with some brown spots or clouds along the anterior margin 

 [ only. 2 



( Antennse black. 2 fidelis 0. S. 



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



Description of the species. 



1. R. iBiacilIata M. % and 9- — Cinereo-fusca, thoracis vittabrunned, 

 ahe maculis majoribus in margine antico, punctis et maculis minoribus 

 in cellulis omnibus, fuscis ; antennje maris bipectinatae. 



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 ; autennffi of the male bipectinate. Long. corp. 0.3 — 0.4. 



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

 Proc. 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 ; haltcres pale ; feet tawny ; coxa3 and base of the 



