50 U.S. NATIONAL MUSEUM BULLETIN 244 



Canada and USA, pt. 2, p. 102, 1939.— Forbes, Bull. Mus. Comp. Zoology, 

 vol. 90, no. 2, p. 368, 1942. — Jones, Trans. Amer. Ent. Soc, vol. 71, pp. 

 99-123, 1945.— Betrem, Tijdschr. Ent., vol. 95, p. 338, 1952. 



Type of genus. — Oiketicus macleayi Guilding, 1827. Monobasic. 



Male. — Moths of rather slender build. Antennae bipectinate, 

 pectinations arising mostly mesad, gradually decreasing in length to 

 apex. Forelegs (fig. 174) greatest in length, without epiphysis. 

 Mid- and hindtibia each with one apical spur. 



Wings broad, unicolorous, various shades of fuscous, uniformly 

 scaled. Venation (fig. 156) 12 and 8 pattern, individually variable. 

 Primaries with R3 and 4 usually stalked, occasionally stalked with 

 R5; M2 and 3 usually stalked, sometimes connate or even separate; 

 medius unbranched within discal cell in all species except C. surina- 

 mensis and C. watsoni; lA curved downward to fuse with 2 A beyond 

 middle of wing; 2A and 3A connected near their bases, from their 

 junction 3A continuing as spur toward inner margin. Secondaries 

 with Sc+Ri separate throughout length, not connected by crossvein; 

 Ml sometimes absent, usually arising either at or below junction 

 of crossvein r-m and M; base of medius usually undivided within cell. 



Male genitalia. — Elongate, slender, with prominent apical notch 

 in tegumen. Valves slender, pulvilli very reduced or almost non- 

 existent; apical extremity of sacculus minutely spined. Aedeagus 

 slender, without bulbous expansion of base. 



Eighth sternite with base frequently rather weak; furcations usually 

 long, slender, often exceeding base in length 2-3x. 



Female. — Vermiform, all external appendages vestigial. Head and 

 dorsal area of thorax slightly sclerotized. 



Female genitalia. — (Fig. 254.) External structures very weakly 

 sclerotized, mostly membranous. Ductus seminalis short, ji as long 

 as spermatheca. Bursa small, approximately same volume as 

 spermatheca. 



Discussion. — In this genus the male genitalia and eighth abdominal 

 sternite are useful in specific determination as well as generic delimi- 

 tation. The antennal structure also is very helpful in certain 

 instances. 



An examination of the holotype of Cryptothelea macleayi has revealed 

 that this species is congeneric with, but specifically distinct from, the 

 other members of the genus Platoeceticus . It is necessary, therefore, 

 for Platoeceticus to be replaced by the earlier name. This decision is 

 based on rather circumstantial evidence, which is discussed under 

 C. macleayi. 



