150 PROCEEDINGS OF THE NATIONAL MUSEUM vol. »o 



yet clearly definable into two genera. I have examined several hun- 

 dred specimens and find that veins 2 and 3 of the fore wing vary from 

 remote to stalked in every species, frequently differing on the two sides 

 of a specimen. The genitalia support the view that in the case of the 

 species of Semioscopis we are actually dealing with one genus. In 

 Agonopterix and Depressaria their separation is supported by geni- 

 talic evidence. 



Busck ^® recognized six species in this genus. Forbes '^ later removed 

 alleneUa to Agonopterioo. For this species I have erected a new genus. 

 Two species, mcdunnoughi and hraunae^ are described as new in this 

 paper bringing to a total of seven the number of species for the genus. 



KEY TO THE SPECIES OF SEMIOSCOPIS BASED ON 

 COLORATION 



1. Fore wing with a dark, outwardly curved bar at end of cell 2 



Fore wing without such bar at end of ceU; ground color gray or 



whitish, strongly irrorated with grayish fuscous and without 



large, conspicuous dark spots or dashes inornata Walsingham (p. 155) 



2. Discal mark continued toward base as a straight or curved bar or 



series of short lines 4 



Discal mark not continued toward base 3 



3. Fore wing sordid whitish marked with small contrasting black 



irrorations braunae, new species (p. 159) 



Fore wing whitish gray marked with small black irrorations and 



generally suffused with fuscous megamicrella Dyar (p. 157) 



4. Discal mark continued toward base as a strongly contrasted 



curved bar 5 



Discal mark not continued toward base as a curved bar 6 



5. Discal bar reaching base of fore wing packardella (Clemens) (p. 151) 



Discal bar sharply terminated at basal third of fore wing. 



merriccella Dyar (p. 153) 



6. Second segment of labial palpus suffused with blackish on distal 



half; third segment contrastingly marked black and white 



aurorella Dj-ar (p. 160) 

 Second segment of labial palpus almost wholly blackish exteri- 

 orly; third segment weakly mottled black and white 



mcdunnoughi, new species (p. 162) 



KEY TO THE SPECIES OF SEMIOSCOPIS BASED ON MALE 

 GENITALIA 



1. Ventral margin of sacculus with prominent extension (figs. 137, 138, etc.). 2 

 Ventral margin of sacculus without prominent extension (fig. 135) 6 



2. Extension of sacculus slender, simple, pointed (fig. 137) 



inornata Walsingham (p. 155) 

 Extension of sacculus otherwise 3 



3. Extension of sacculus bifurcate (figs. 140, 141) 4 



Extension of sacculus otherwise (figs. 138, 139) 5 



M Busck, A., Proc. U. S. Nat. Mus., vol. 35, p. 201, 1908. 



ST Forbes, W. T. M., CorneU Univ. Agr. Exp. Stat. Memoir 68, p. 241, 1923. 



