772 PROCEEDINGS OF THE NATJONAI. MUSEUM. vol xxv. 



Bla.stobusida' and a very similar one in the genus Baeeulatri.f in the 

 Tineida>. 



The reason for these strangely recurrino- specializations is difficult 

 to explain and will not be fully understood ])efore we learn the true 

 biological use of them, but that they do recur is sufficient proof of 

 their secondar}^ value as generic characters. 



Thus it will be found that within the same genus the palpi may varv 

 considerably, while the venation wmII be found to be very constant, at 

 most varying in the coincidence of two veins, already long-stalked in 

 the allied species, or the obliteration of a transverse vein, which in the 

 related forms had a tendency to become obsolete. 



Of the 35 genera now recognized in this family from North America 

 7 are widely distributed, cosmopolitan ornearl}^ so; 7 others are found 

 in Europe; 2 are recorded from Africa, and 19 have not been recog- 

 nized outside of North America, including the West Indies. 



They may be separated by the following synoptic table: 



Forewings with veins 7 and 8 out of 6 1 



Forewings with vein 6 separate or out of liase of 7 11 



1. Basal joint of antennae with pecten Sitnlniga, p. 781 



Basal joint without pecten 2 



2. Forewings with one or more veins al)sent 3 



Forewings with all veins present 4 



3. Forewings with vein 11 absent Agnippe, p. 789 



Forewings with vein 11 present Helice, p. 804 



4. Hindwings with veins 3 and 4 sei:)arate 5 



Hindwings with veins 3 and 4 connate or stalked 7 



5. Hindwings of male with costal row of Ijristles Glaucc, ]i. 783 



Hindwings without such row 6 



6. Second joint of labial palpi with long spreading hairs Paltodora, p. 775 



Second joint of labial palpi merely rough-haired beneath Metzncria, p. 773 



7. Hindwings with vein 6 absent Evippe, p. 805 



Hindwings with vein 6 present 8 



8. Forewings with veins 3 and 4 stalked Tri/jxinismd, p. 815 



Forewings with veins 3 and 4 not stalked 9 



9. Forewings with veins 2, 3, 4, and 5 separate ecjuidistant Epithectii<, p. 816 



Forewings with veins 2, 3, and 4 approximate, long; vein 2 distant, short. . . 10 



10. Second joint of labial palpi with long expansible tuft on inner side. 



Eacordyka, p. 807 

 Labial palpi without such tuft Recurvaria, p. 807 



11. Forewings with veins 2 and 3 stalked 12 



Forewings with veins 2 and 3 separate 16 



12. Sec( )nd joint of labial palpi with long pn ijecting tuft 13 



Labial palpi without such tuft 14 



13. Tuft expansible [northosia, p. 91 7 



Tuft not expansible Ypsolophux, p. 920 



14. Hindwings narrower than forewings Strobisia, p. 904 j 



I lind wings broader than forewings 15i 



15. Male antenna^ with deep notch near base Glijpkipdocera, p. 916| 



Male antenna- without such notch Tricliotaphe, p. 906 



16. Forewings with one or more veins absent Mciu'sta, p. 902 



Forewings with all veins present , . . 17 



