RiiYpncLornrs. i-iJ 



Brownisb-graj ; palpi blackish ; antennte brown, four basal 

 joints pale yellow ; flagellum of the male densely clothed with a 

 long, soft, pubescence ; only a few verticillate hairs reach above 

 it ; joints elongated, becoming longer towards the tip ; flagellum 

 of the female with a much shorter pubescence, and hence, verti- 

 cillate hairs more distinctly visible ; thorax with a brownish tinge 

 above and an indistinct intermediate brownish stripe ; two rows 

 of blackish hairs on the posterior part of the mesonotum ; coxae 

 grayish-brown ; feet brown, with an appressed pubescence, which 

 appears golden-yellow in a reflected light; trochanters and basis 

 of the femora paler ; knob of the halteres yellow ; its basis and 

 the stem with a pale grayish tinge ; abdomen grayish-brown ; 

 horny appendages of the male forceps sharp, black. Wings uni- 

 formly gray, with a somewhat more brownish tinge in the region 

 of the stigma; seventh longitudinal vein approximated to the sixth 

 on its anterior half, strongly diverging beyond the middle, and 

 thus the axillary cell much broader at the tip than in the middle ; 

 discal cell elongated, narrow ; the inner end of the third posterior 

 cell is nearly opposite its middle ; all the veins comparatively 

 slender. 



Hab. Washington, D. C. Two specimens. 



4. R. bolotriclilis 0. S. 9- — Fuscanus ; alis immaculati.5 ; cellula 

 discoidali aperta, cum secunda posteriori confluens ; venis sixta et sep- 

 tima longitudinalibus convergentibus ; antennis nigris. 



Brownish ; wings immaculate ; discal cell open, confluent with the second 

 posterior cell ; sixth and seventh longitudinal veins convergent ; antennae 

 black. Long. corp. 0.23. 



Syn. Erioptera holotricka 0. Sackex, Proc. Ac. Nat. Sc. Phil. 1859, p. 226. 



Palpi and antennje blackish ; thorax uniformly pale yellowish- 

 gray above, with some pale hairs ; stripes hardly marked at all ; 

 halteres yellowish ; coxas and basis of the femora brownish- 

 yellow ; the remainder of the feet brown ; abdomen grayish- 

 brown, with a pale, erect pubescence. Wings of a uniform pale 

 yellowish-brown color ; veins not darker than the ground color ; 

 a darker shade in the stigmatic region ; discal cell open, confluent 

 with the second posterior cell ; the latter portion of the seventh 

 vein is rather approximated to the sixth vein, in such a manner 

 that the axillary cell is not broader at the tip than in the middle. 



