514 PROCEEDnNGS OF THE NATIONAL MUSEUM vol. ii4 



7. Cucullus of harpe with apical portion broadly expanded (fig. 39) ; vesica of 



aedeagus unarmed (fig. 40) 4. acornus, new species 



Cucullus of harpe with apical portion not broadly expanded (figs. 43, 46) ; 

 vesica of aedeagus armed with cornuti (figs. 45, 47) 8 



8. Cucullus of harpe with approximate central third moderately expanded 



ventrad (fig. 43) ; vesica of aedeagus armed with approximately 6 to 12 



small cornuti (figs. 44, 45) 5. simulatus Walsingham 



Cucullus of harpe not expanded ventrad (fig. 46) ; vesica of aedeagus armed 

 with 2 large cornuti (fig. 47) 7. bicornutus, new species 



9. Antennae strongly bipectinate 10 



Antennae unipectinate or laminate 11 



10. Forewing with prominent, irregular, white patch in basal half; furcae of 



uncus subparallel to slightly convergent, with distance between apices much 

 less than length of each furca (fig. b7) ; harpe with base of cucullus broad 

 and indistinctly merging with costa and sacculus (figs. 83, 85) ; vesica of 



aedeagus unarmed (figs. 84, 86) 16 



Forewing without white patch; furcae of uncus divergent, with distance 

 between apices at least equal to length of each furca; harpe with base of 

 cucullus narrowed and separated from costa and sacculus by ventral con- 

 striction (fig. 49); vesica of aedeagus armed with numerous, small cornuti 

 (figs. 52, 53) 8. filicicornis (Walsingham) 



11. Harpe with long, prominent costal process overlapping cucullus (figs. 54, 58). 



9. plumifrontellus (Clemens) 

 Harpe without costal process 12 



12. Furcae of uncus with bases broadly separated and developed ventrad into pair 



of prominent, semicircular plates with dentate margins; furcae with major 



portions convergent and overlapping distad, with apical portions flattened 



dorsoventrad and divergent (figs. 61, 62, 63) . 10. mortipennellus (Grote) 



Furcae of uncus not as above 13 



13. Furcae of uncus abruptly directed or curved very strongly ventrad through 



angle of approximately 90 degrees (figs. 8, 9, 69) ; vesica of aedeagus armed 

 with either one large cornutus (fig. 66) or two large clusters of cornuti 



{6gs. 10, 11, 12); {popeanellus-klotsi species group) 14 



Furcae of uncus not curving strongly ventrad (figs. 70, 98) ; vesica of aedeagus 

 either unarmed (figs. 79, 84, 86, 101) or armed with very small cornuti not 

 arranged in clusters (fig. 97) 15 



14. Furcae of uncus abruptly directed ventrad, broadly expanded and flattened 



in lateral aspect (figs. 9, 16, 17); vesica of aedeagus armed with two large 



clusters of cornuti (figs. 11, 12) 11. popeanellus (Clemens) 



Furcae of uncus curving strongly ventrad, unexpanded and only slightly 

 flattened in lateral aspect (fig. 69) ; vesica of aedeagus armed with one large 

 cornutus (fig. 66) 13. klotsi, new species 



15. Furcae of uncus tubular, divergent, with distance between apices approxi- 



mately equal to length of each furca (figs. 74, 75) ; eastern species: Missouri, 



Arkansas, and eastward 14. propinquus (Walsingham) 



Furcae of uncus somewhat flattened laterad, subparallel, with distance be- 

 tween apices much less than length of each furca (figs. 87, 99) ; south- 

 western species: Texas, New Mexico, and Arizona 16 



16. Harpe rather slender, with base of cucullus narrowed and separated from 



costa and sacculus by dorsal and ventral constrictions (figs. 95, 100) ; 

 forewing without prominent white patch in basal half; (arizonellus-luriei 

 species group) 19 



