16 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



This species, along with illustra, aletha, mucida, obscura, and optima, 

 appear to form a closely related group within the genus. The macu- 

 lation is very similar and the genitalia have certain general character- 

 istics in common. There are sufficient distinguishing characters to 

 separate the species; however, additional remarks concerning relation- 

 ships must await further information. 



Lethata illustra, new species 



Plate 2 (fig. 6); Figures 21, 22, 37; Map 6 



Alar expanse 27-32 mm. 



Antenna brownish. Head whitish, second segment of labial palpus 

 brown on outer side, whitish on inner side, apical segment brownish. 

 Legs whitish shaded with brown. Thorax and tegula purplish brown. 

 Forewing brown shaded with darker brown on basal two-thirds ; costa 

 narrowly ochreous; spot at end of cell consisting of ring of purplish 

 scales enclosing white spot; a faint, outwardly curving transverse line 

 from costa above spot to near tornus; entire wing sprinkled with 

 fuscous scales; cUia brown. Hind wing whitish overcast with gray; 

 cilia whitish at anal angle, grayish at apex. 



Male genitalia (slide WDD 3618): Uncus short, recurved; gnathos 

 short, broad, dorsally concave; harpe short, of approximately uniform 

 width to midpoint, then tapering to bluntly pointed apex; anellar 

 lobes asymmetrical, one consisting of a lightlj^ sclerotized, setiferous, 

 digitate process anteriorly and a long, heavily sclerotized, falciform 

 process posteriorly, other consisting of large basal area with two apical 

 processes similar in position and shape to opposite lobe but shorter; 

 aedeagus with large lateral spine near apex, vesica armed with one 

 large cornutus. 



Female genitalia (slide WDD 3616, t^^pe) : Ductus bursae sclero- 

 tized and corregated from ostium bursae to inception of ductus 

 seminalis; ostium bursae sclerotized, partially divided at middle by 

 incomplete internal partition from lateral wall; ostium broad, some- 

 what flared laterally; inception of ductus seminalis near corpus bursae. 



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



Type-locality: La Oroya, Rio Inambari, 3100 ft., Peru. 



Distribution: Peru: La Oroya, Rio Inambari, 3100 ft. (October); 

 Santo Domingo, Carabaya, 6000-6500 ft. (December). 



Described from the female holotype: "La Oroya, R. Inambari, 

 S. E. Peru, 3100 ft., wet s., Oct. 1904 (G. Ockenden)"; one female 

 paratype: "Diff. local in Carabaya, dry s., 2500-6000 ft., VI 04 

 (G. Ockenden)"; one female paratype: "S. Domingo, Carabaya, 

 6500 ft., Dec. 02, wet s., (G. Ockenden)"; and one male paratype: 

 "S. Domingo, Carabaya, 6000 ft., XII 01, wet seas. (Ockenden)." 



The asymmetrical anellar lobes readUy distinguish this species. 



