MICROLEPIDOPTERA OF JUAN FERNANDEZ ISLANDS — CLARKE 21 



pointed triangle. Anellus an oval plate. Gnathos slightly longer 

 than imcus. Uncus moderately broad, pointed. Anterior margin 

 of vinculum with deep, U-shaped excavation. Aedeagus long, slender, 

 armed with a stout, curved spine. 



Female genitalia (slide 10258) : Ostium broad, ventral lip asym- 

 metrical, short, strongly sclerotized, posterior edge rounded. Pos- 

 terior half of ductus bursae sclerotized. Inception of ductus seminalis 

 at anterior end of sclerotized part of ductus bursae. 



Type: Masatierra: Plazoleta del Yunque, 200 m. (Mar. 3, 1955). 



Described from the male type, three male and one female paratypes, 

 all from the type locality, dated (Dec. 28, 1954, Jan. 9, 1952, Mar. 3, 

 1955). 



This is a variable species, no two being exactly alike. The median 

 streak may, or may not, be well defined, in some examples being 

 obscured by the ground color. One specimen exhibits considerable 

 reddish-brown scaling in the dorsal area and all show differences in 

 the intensity of color of the cilia of the hindwings. 



The affinities of fundus clearly appear to be with oxyechus and 

 arcus. From oxyechus the males of fundus can be distinguished by 

 the shallower excavation of the vinculum, the broad, fleshy cucullus, 

 pointed, triangular process of saccculus and the straighter gnathos; 

 from the males of arcus by the absence of a costal process of harpe and 

 the absence of a tooth on the terminal process of sacculus. The 

 females of fundus can be distinguished from those of both oxyechus 

 and arcus by the short, asymmetrical ventral lip of ostium. 



Femandocramhus truncus, new species 

 Figures 15-16 



Alar expanse 14-19 mm. 



Labial palpus grayish fuscous outwardly; basal segment and entire 

 innerside ocherous white. Head brownish, face fuscous. Antenna 

 grayish fuscous with ill-defined paler annulations. Thorax and 

 ground color of forewing grayish fuscous; tegula ocherous white; 

 an ocherous-white median streak extends from base of forewing to 

 end of cell, or sometimes nearly to termen, somewhat broader distally 

 than basally and sometimes crossed in outer third by two ill-defined, 

 oblique, grayish-fuscous bars; extreme edge of costa at outer three- 

 fourths ocherous white; cUia slightly paler than ground color. Hind- 

 wing gray, deepening to grayish fuscous outwardly; cilia sordid 

 ocherous white with a broad grayish-fuscous basal band. Legs 

 ocherous white suffused and overlaid with grayish fuscous. Abdomen 

 grayish fuscous, somewhat paler beneath and tipped ocherous white. 

 Entire upper surface of insect with shining, brassy hue. 



