78 WILLIAM G. LIETZ, M. D. 



HOMOSETIA Clem. \Pithys, Ch.) 



Type tricingulatella Clem. 



Head entirely rough haired, sometimes in lateral tufts on the 

 vertex. Labial palpi cylindrical, spreading, semi-porrect ; second 

 joint slightly incrassate towards the apex, with spreading apical and 

 generally lateral setse, terminal joint shorter than the second, pointed. 

 Maxillary palpi plicate. Antennae three fourths the length of the 

 forewings, rarely (subgenus Diachorisia), only one-half, with closely 

 set joints, not or very finely pubescent in the male, more rarely with 

 verticillate scales, and distinctly pubescent in the male (Diachorisia). 

 Eyes round, visible from above. 



Forewings elongate-lanceolate, with or without scale tufts. All 

 veins present, free, or 7-8 stemmed (Diachorisia') ; vein 2 sometimes 

 obsolete towards its origin ; vein \ b simple. Hindwings scarcely 

 over one half, lanceolate or lineo-lanceolate, costa retuse in its outer 

 two or three fifths, cilia over 2, 8 veins, free, or rarely (subgenus 

 Stenoptinea), veins 5 and 6 stemmed. Posterior median moderately 

 distant (Calostinea., Diachorisia), or else very close to the wing 

 margin, and vein 2 merely rudimentary (Homosetia, Stenoptinea). 

 Cell closed. Internal veins absent except in Calostinea and Diacho- 

 risia. Hind tibia rough haired. 



Narrow-winged species, differing essentially from Tinea L. only 

 in vein V> of forewings being simple at base. As here defined the 

 genus includes the genus Semele Ch. and Diachorisia Clem. Semele 

 cristastella, the type of the genus is a true Homosetia, whereas the 

 other two species argentinotella and argentistrigella, placed by 

 Chambers in this genus, differ somewhat structurally. Diachorisia, 

 the type of which 1 have critically examined, is not sufficiently dis- 

 tinct to warrant its retention as a distinct genus. Dr. Clemens' 

 description as well as delineation of the hindwing, is erroneous; the 

 costal margin is distinctly emarginate in its outer half, veins 5 and 

 6 are apparently free, and vein 8 attains the margin just beyond the 

 middle. There is nothing in the type, suggestive of any close rela- 

 tionship to Incorvaria or Eudarcia, as pointed out by the ajthor. 



On account of structural differences, I shall arrange the species 

 under four subgenera, as follows : 



Forewings with an accessory cell; no scale tufts. Hindwings with posterior 

 median vein not close to wing margin, internal vein present. 

 Antennae of % distinctly pubescent; forewings without metallic markings; 

 veins 7 8 stemmed ; costa of hindwings distinctly emarginate. 



Diachorisia. 



