132 ENTOMOLOGICAL SOCIETY 



form a stripe. Fore wings veined as in Psychomyia, fork i not present ; 

 hind wings more excavate on apical half of front margin than any 

 figured species, and fork 3 is not present, thus like Ecnomus; fringe 

 on hind edge of hind wings about as long as width of wirtg; middle 

 tibise and metatarsi plainly dilated in female. 

 Expanse, n mm. 



One female from Colorado (No. 2133), probably Ft. Collins 

 or Denver. 



Rhyacophila torva Hagen (PL IX, fig. 16). 



In the Eastern States there are at least three allied species. I 

 identify as R. torva a form with more spotted wings than the 

 others. It has the lower branch of the median vein in fore 

 wings forked before the middle, so that the fork is longer than 

 its pedicel ; this fork is not as near base as the fork of the upper 

 branch of the radial sector. The male genitalia show a forked 

 process each side below. 



I have specimens from Sherbrooke, Canada; Franconia, 

 N. H., and Sea Cliff, N. Y. 



Rhyacophila terminata, n. sp. (PI. VIII, fig. 7). 



In this species the lower branch of the median vein in fore wings is 

 forked much beyond the middle, so that the fork is much shorter 

 than its pedicel, and no longer than the fork of the upper branch. The 

 wings are not very dark, rather sparingly flecked with yellow, and 

 the basal joint of the antennae is much darker than the others. The 

 male genitalia show a pair of very long appendages below. 



From Delaware Water Gap, New Jersey. Two females 

 from Ithaca, N. Y. agree in venational characters, but are in 

 poor condition. 



Rhyacophila nigrita, n. sp. 



Much like R. torva; with the fork of lower branch of the median 

 vein before the middle, so that the fork is longer than the pedicel; 

 this fork is as near to the base of wing as the fork of upper branch 

 of the radial sector. Wings a deeper black than in R. torva. 



Two specimens from the Black Mts., North Carolina, June. 



EXPLANATION OF PLATES. 



FIG. i. Thremma deceptiva: wings. 



2. (Ecetina apicalis: male genitalia. 



3. Setodes v emails: male genitalia. 



