58 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
hindleg ocherous white with sparse, grayish-fuscous irroration. Ab- 
domen grayish fuscous dorsally; ventrally ocherous white. 
Female genitalia slide JFGC no. 11615. Ostium very wide, slitlike. 
Antrum narrowly sclerotized. Ductus bursae scarcely definable. 
Bursa copulatrix with serrate sclerotized area, where it joins ductus 
bursae, and an elongate, sclerotized portion dorsally; lamella post- 
vaginalis broad, lightly sclerotized. 
Holotype: U.S. National Museum No. 69748. 
Type-locality: Peru, Cusco, Machu Picchu, 2385 m. 
Distribution: Peru. 
Described from the female holotype (5.III.1959, J. F. G. Clarke), 
and one @ paratype with the same data. 
In placing arrhostia in Phtheochroa I do so with some hesitation, 
but there is no other available genus that has a female approaching 
this. Hubner’s rugosana, the type of the genus, exhibits the broad 
ostial opening as in arrhostia, but the latter has much more sculp- 
turing in the bursa copulatrix. 
Selected References 
Buscx, August 
1939. <A generic review of the family Phaloniidae with descriptions of two 
new genera and one new species. Bull. Southern California Acad. 
Sci., vol. 38, pt. 2, pp. 98-111. 
CuarRKgE, J. F. GATES 
1963. Catalogue of the type specimens of Microlepidoptera in the British 
Museum (Natural History) described by Edward Meyrick, vol. 
IV, 521 pp., 252 pls. 
Razowskl, J6ZEF 
1964. Studies on the Cochylidae (Lepidoptera), pt. X: The genitalia of the 
types of the Cochylidae described by Walsingham. Ann. Zool. 
Polska. Akad. Nauk, vol. 22, no. 16, pp. 356-385. 
