70 U.S. NATIONAL MUSEUM BULLETIN 2 57 



This opportunity is used for the selection of a lectotype. This is 

 a male, labelled as follows: "Java, Tegal, 9 [sic], Lucassen" "Lucas- 

 sen, Kemanglen, Tegal, Java, 9.1888, Boorder, PL II Fig. 7, cf' (a 

 hand\vTitten green label, referring to the original figiu-e of 1890). 

 "Museum Leiden, schistaceana. Det. SneU." 



Argyroptocha, new genus 



Head with dense, appressed scales forming a short roughish crest 

 on forehead, face smooth. Ocellus posterior. Proboscis developed. 

 Antenna pubescent in male. Palpus moderate, porrected, slightly 

 curved upward, median segment rough below and along apex, gradu- 

 ally dilated apicad, terminal segment very short, concealed. Thorax 

 without a creast (hindtibia missing). 



Forewing elongate, subtruncate, termen sinuate. Vein 2 from 2/3, 

 3 and 4 connate from angle, 5 approximated, 6 and 7 closely approxi- 

 mated toward base. 



Male genitalia. Tegumen large and high. Uncus quadrate, 

 broad, not clearly separated, densely haired on top. Socius probably 

 represented by a row of bristles on each side. Gnathos indefinite. 

 Valva slender, moderately sclerotized throughout; sacculus 1/2, 

 ending in a triangular patch of bristles. Cucullus hairy, narrowed, 

 curved inwards, top bifurcate, upper hook with a short tooth. Anellus, 

 a long and strong band. Aedeagus straight and broad, rather weak. 

 Cornuti, a sheaf of thin spines. 



Type species: Argyroptocha phalaenopa, new species (cf). 



A curious genus with a general Olefhreutes appearance, but nearest 

 to the preceding; with peculiar genitalia, somewhat approaching the 

 Laspeyresiine type. In spite of considerable differences in neuration 

 it might be aUied to Helictophanes Meyrick or Cyphophanes Meyrick, 

 two genera which have not been sufficiently investigated so far: only 

 a single specimen of both has ever been described, from south India 

 and Java, respectively. The male genitalia of these three genera 

 present marked conformity of shape and structure; the high tegumen, 

 contrasting mth the narrow valva and especially articulation of the 

 latter, beside giving proof of far advanced specialization, also suggest 

 a relation Math the tribe Laspeyresiini. The widely diverse superficial 

 appearance of the species may point towards considerable antiquity 

 of the fascinating group. 



Argyroptocha phalaenopa, new species 



Figures 91-93, 542 

 Male, 19 mm. Head and thorax light ochreous olive, thorax with a 

 pale spot in center. Palpus light ochreous olive, median segment 



