NEOTROPICAL MICROLEPIDOPTERA — DUCKWORTH 99 



been illustrated in figure 2j. Other species were found lacking this 

 condition, and since it is possible that the tips of the setae might be 

 broken during the preparation of slides of the genitalia, definite con- 

 clusions concerning their presence or absence must await examination 

 of additional material. 



Key to the Species of Lethata Based on the Genitalia 



1. Male 2 



Female 14 



2. Anellar lobes symmetrical 3 



Anellar lobes asymmetrical 13 



3. Vesica armed with coniuti 4 



Vesica without cornuti 12 



4. Vesica armed with small spiculate cornuti 5 



Vesica armed with one or more large, heavily sclerotized cornuti ... 7 



5. Harpe with saccular lobe bearing two long, heavily sclerotized setae. 



L. trochilosticta (Walsingham) 

 Harpe not as above 6 



6. Anellar lobes approximately triangular with single, short spine at apex; 



aedeagus without spine, apex blunt L. fusca, new species 



Anellar lobes narrow with large, strongly recurved, hooklike spine at apex; 

 aedeagus with posterior spine, apex sharply pointed. 



L. satyropa (Meyrick) 



7. Aedeagus with apical process; anellar lobes narrowing sharply at middle 



forming narrow, apically acute projections 8 



Aedeagus without apical process; anellar lobes not narrowing sharply at 

 middle 9 



8. Aedeagus with apical process hooklike L. buscki, new species 



Aedeagus with apical process straight L. asthenopa (Meyrick) 



9. Aedeagus with vesica armed with more than six cornuti 10 



Aedeagus with vesica armed with less than six cornuti 11 



10. Aedeagus large, broad basally, vesica armed with ladder-like series of large to 



small cornuti extending from base to apex; anellar lobes of near uniform 



width throughout L. invigilans (Meyrick) 



Aedeagus small, narrow, vesica armed with two clusters of small cornuti at 

 apex and single, large cornutus basally; anellar lobes approximately 

 triangular in shape, pointed at apex . . . . L. maculata, new species 



11. Anellar lobes serrate beyond apical third; harpe broader basally. 



L. bovinella (Busck) 

 Anellar lobes not serrate; harpe of approximately equal width throughout. 



L. leucothea (Busck) 



12. Aedeagus with two laterally directed processes at apex, one extending from 



each side, the larger one slightly recurved . . . L. glancopa (Meyrick) 

 Aedeagus with large, heavily sclerotized process posteriorly. 



L. pyrenodes (Meyrick) 



13. One anellar lobe long, narrow, curved 90° laterad at middle and extending 



to base of opposite harpe; the other shorter, broader, sharply recurved; 

 aedeagus with large, recurved spine at apex . . L. aromatica (Meyrick) 

 One anellar lobe narrow, pointed at apex; the other broad with three large 

 spines apically; aedeagus with apex on one side produced into long blade- 

 like process L. ruba, new species 



