RHYPHOLOPHUS. 145 



brown ; discal cell open, confluent with, the third posterior cell. Long, 

 corp. 0.2—0.25. 



Syn. Erioptera meigenii 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 226. 



Head grayish, rostrum and palpi brown ; antennae brownish ; 

 those of the male, if bent backwards, would not reach much 

 beyond the root of the wings ; the joints of the flagellum are 

 elongated, subcylindrical, with a long, soft pubescence; those of 

 the female have the joints shorter, beset with verticils and scat- 

 tered hairs, but without any conspicuous pubescence. Thorax 

 of a uniform, dull yellowish-gray ; beset with yellow hairs on the 

 back, as well as on the pleurae and on the halteres ; the latter 

 with a yellow knob. Abdomen brown, with a soft, long, erect 

 yellowish pubescence ; genitals of the male reddish-brown ; horny 

 appendages black ; feet brownish ; coxae and basis of the femora 

 paler; knees likewise somewhat pale. Wings brownish-gray, 

 shorter and comparatively broader than in R. rubellus and R. 

 monlicola ; veins much stouter, dark brown ; stigma distinct, 

 brown ; usually there is a clearer spot at the end of the first basal 

 cell ; discal cell open, coalescent with the third posterior cell ; 

 seventh longitudinal vein somewhat arcuated, approximated to 

 the sixth, in its latter portion, in such a manner that the axillary 

 cell is not much broader towards the tip than in the middle ; the 

 great cross-vein is usually anterior to the inner end of the discal 

 cell. 



Sab. Middle States ; not rare. 



7. R. monticola, n. sp. % . — Thorace vittis nullis ; alis immacu- 

 latis ; articulis antennariim maris elongatis, pedunculatis, longe pubes- 

 centibus ; cellula discoidali aperta, cum tertia posteriori confluente ; 

 stigmate pallido. 



Thorax without stripes ; wings immaculate ; joints of the antennae of the 

 male elongated, pedicelled, and with a long pubescence ; discal cell open, 

 confluent with the third posterior cell ; stigma pale. Long. corp. 0.22? 



Head and thorax brownish, with a bluish-gray bloom, some- 

 what concealing the ground color. The antennae, if bent back- 

 wards, would reach some distance beyond the root of the wings ; 

 the joints of the flagellum, beginning with the second, are 

 elongated and narrow, terminating in an elongated point, to 

 which is fastened the following joint ; each joint bears, on both 

 10 August, 1863. 



