NO. 3585 MICROLEPIDOPTERA, XII — DUCKWORTH 17 



Lethata aletha, new species 



Plate 3 (fig. 1); Figures 23, 24; Map 9 



Alar expanse 33 mm. 



Antenna brownish. Head brownish, Hghter between eyes; second 

 segment of labial palpus brown on outer side, whitish on inner side, 

 apical segment whitish. Legs whitish, fore- and midlegs heavily 

 shaded with brown. Thorax and tegula brown. Forewing brown 

 shaded with deep ochreous scales; costa narrowly deep ochreous; 

 dorsum purplish to apical two- thirds; spot at end of cell consisting of 

 purplish scales overcast \\ath whitish scales; termen shaded with deep 

 ochreous; cilia whitish basally, brown beyond. Hind wing whitish, 

 heavily shaded with gray scales in anal area; cilia brownish, 



Male genitalia (slide WDD 3612, type): Uncus short, recurved; 

 gnathos dorsoventrally flattened; harpe broad, bluntly rounded; 

 anellar lobes symmetrical, approximately uniform in width, truncate 

 apex bearing dentate spines; aedeagus with one prominent lateral 

 spine at apex, vesica armed with one large cornutus. 



Female genitalia: Unknown. 



Type: In the collection of the British Museum (Natural History). 



Type-locality: Santo Domingo, 6000 ft., southeast Peru. 



Distribution: Known only from the type-locality. 



Described from the male holotype: "Santo Domingo, S.E. Peru, 

 6000 ft., xi. 1904 (G. Ockenden)." 



The single lateral spine at the apex of the aedeagus in the male 

 genitalia separates this species from all others. 



Lethata mucida, new species 



Plate 3 (fig. 2); Figures 25, 26; Map 8 



Alar expanse 2S mm. 



Antenna brownish. Head brownish, lighter between eyes, labial 

 palpus brownish. Legs whitish shaded with brown. Thorax and 

 tegula purplish brown. Forewing as in obscura except with heavy 

 suffusion of purplish in anal area. Hind wing whitish heavily overcast 

 with gray scales; cilia gray. 



Male genitalia (slide WDD 3610, type): Uncus, gnathos, harpe as 

 in obscura; anellar lobes symmetrical, tapering to rounded apex; one 

 large, posteriorly directed spine at apical two-thirds; aedeagus as in 

 obscura except laterally directed spines wider apart and vesica armed 

 with two large cornuti. 



Female genitalia: Unknown. 



Type: In the collection of the U.S. National Museum, no. 69088. 



Type-locality: San Jaoquin, Dept. Santander, Colombia. 



Distribution: Known only from the type-locality. 



228-967—67 3 



