84 DIPTERA OF NORTH AMERICA. [PART IV. 



3. R. domestica 0. S. % and J . — Antenna nigrse, articulis flagelli 

 reniformibus, subpectinatis ; pjenultinio et antepsenultimo flavis. 



Antennre brown, joints of the flagellum reniforin, subpectinate ; the 

 penultimate and antepenultimate joints yellow. Long. corp. 0.3 — 0.35. 



Syn. Rhipidia domestica 0. Sacked, Proc. Ac. Nat. Sc. Phil. 1859, p. 208. 



Front and vertex cinereous ; rostrum and palpi brown ; eyes 

 almost contiguous ; in living specimens dark green above and 

 purple below ; antennas black ; penultimate and antipenultimate 

 joints yellow ; flagellum moniliform ; its joints reniform. Thorax 

 yellowish-brown, sericeous, when viewed in a certain light ; the 

 thoracic stripes (a double intermediate one and broad lateral 

 ones) occupy the posterior part of the mesonotum ; the anterior 

 part shows a brown line in the middle, which is expanded in 

 front, and several brown dots on the humeri ; two brown stripes 

 on the pleurae, one running from the collare, backwards ; the 

 other along the base of the coxae. Halteres tawny, with a dusky 

 spot on the knob ; feet tawny ; coxae and basis of the femora pale ; 

 tips of the femora, of the tibiae, and of the tarsi brown. Abdo- 

 men brownish ; lateral margins of the segments darker ; forceps 

 tawny (Tab. Ill, fig. 5 and 5 a). Wings tinged with pale brownish ; 

 first and fifth longitudinal veins yellowish ; the others brownish ; 

 five brown spots along the first longitudinal vein, more or less 

 expanded on both sides of this vein in the shape of clouds ; the 

 third spot (counting from the root of the wing) is connected with 

 a cloud at the origin of the prasfurca ; the fifth is a round spot at 

 the tip of the first longitudinal vein ; it is connected with a cloud, 

 surrounding the stigma, the centre of which is pale ; a pale cloud 

 at the inner end of the submarginal cell ; tips of all the longi- 

 tudinal veins and all the cross-veins clouded ; pale, indistinct 

 clouds in some of the cells. 



Hab. Washington, D. C, not rare; Palisades, New Jersey. 

 I have seen in the Berlin Museum a specimen from Brazil, which 

 I believe to be the same species. 



Gen. IV. MxWtf OBIA. 



One submarginal cell ; four posterior cells ; a discal cell. The marginal 

 cross-vein is sometimes at the tip of the first longitudinal vein, but often 

 at some distance anterior to this tip, crossing the stigma ; the tip of the 

 auxiliary vein is usually far beyond the origin of the prsefurca. Antennae 



