MICROLEPIDOPTERA OF JUAN FERNANDEZ ISLANDS — CLARKE 13 



2. Forewing ground color fuscous or brown 3 



Forewing ground color grayish buflf; without longitudinal streak; alar 



expanse 26 mm. corvus, new species 



3. Forewing with median longitudinal buflf streak; alar expanse 15-17 mm. 



fundus, new species 

 Forewing without median longitudinal streak 4 



4. Forewing with well-defined transverse, pale subterminal line. 



brunneus Aurivillius 

 Forewing without well-defined transverse subterminal line 



fuscus Aurivillius 



5. Forewing with pale longitudinal streak 6 



Forewing without longitudinal streak 8 



6. Male genitalia with costal process of harpe present; ventral lip of ostium 



reduced 7 



Male genitalia without costal process from harpe; ventral lip of ostium 

 large, expanded posteriorly truncus, new species 



7. Armature of aedeagus a strong curved hook; process of sacculus stout, 



pointed; lip of ostium subrectangular in outline . backstromi Aurivillius 



Armature of aedeagus a barb; process of sacculus not pointed; lip of ostium 



triangular in outline kuscheli, new species 



8. Hindwing grayish fuscous; alar expanse 14-18 mm . oxyechus, new species 

 Hindwing grayish buff; alar expanse 20-27 mm .... arcus, new species 



Fernandocrambus brunneus Aurivillius 



Figures -^6 



Fernandocrambus brunneus Aurivillius, 1922, in Skottsberg, The natural history 

 of Juan Fernandez and Easter Island, vol. 3, pt. 2, p. 264, pi. 11, fig. 11. 



Alar expanse 18-23 mm. 



Male genitalia (slide 10140): Costa of harpe short, strongly sclero- 

 tized, with long, slender distal process; cucullus a long, paraUel-sided, 

 fleshy lobe. Sacculus broad, strongly sclerotized, terminating in a 

 bluntly pointed, notched process. Uncus straplike, terminating in a 

 blunt point. Gnathos longer than uncus; distal end sHghtly dilated. 

 Aedeagus stout, straight, armed with a strong, pointed, apical process. 



Female genitaha (sUde 10141): Ostium wide; ventral lip broadly 

 triangular. Ductus bursae membranous except for a short, widened, 

 sclerotized section before ostium. Ductus seminahs from middle of 

 ductus bursae. 



Type: Naturhistoriska Riksmuseum, Stockholm. 



Type locality: "Masatierra." 



Distribution: Masatierra: Bahia Cumberland, 8cfcf, 2 $9 (Mar. 4, 

 1951), 9 (Feb. 15, 1951); Villagra, cf (Feb. 21, 1951). 



In general appearance brunneus is similar to fuscus. The genitalia 

 of the two, however, differ markedly. The costa of the harpe of 

 brunneus is armed with a strongly pronounced process, absent in 

 juscus; the anterior edge of the vinculum oijuscus is concave, that of 

 brunneus convex. The gnathos of juscus is distorted but that of 

 brunneus is nearly straight, tapering. 



