48 U.S. NATIONAL MUSEUM BULLETIN 25 7 



The characteristic genus, recognized and resurrected by Obraztsov 

 (personal communication) and by Hannemann (1961), contains in 

 the Palaearctic and Palaeotropic regions several very similar species, 

 hitherto mostly attributed to ^'Eudemis" purpurissatana Kennel, 

 which species, however, is not even congeneric, as ascertained by 

 Falkovitch recently. It belongs to Eudemopsis Falkovitch, 1962. 



The genus Eudemis represents a large complex of species which I 

 propose to divide into two subgenera. The subgenus Eudemis Hiibner, 

 new status, comprises chiefly Palaearctic species, of which the males 

 have no additional coremata and posses a simple valva. The sub- 

 genus Acanthothyspoda Lower, new status, contains tropical species, 

 usually greenish-colored, males \vith. abundantly hau-ed posterior 

 tibiae, with lateral pairs of hair pencils, being additional coremata 

 on most abdominal segments, with a more complicated valva, and 

 often with socii spiny at the top. The peculiar external characters 

 are restricted to the males and should, consequently, be regarded as 

 secondary sexual characters only. They are absent in true Eudemis 

 but not well developed in some tropical Acanthothyspoda. The 

 specialized (plesiomorph) Eudemis species and apomorph Acanthothy- 

 spoda species appear to approach each other closely, linked by inter- 

 mediate forms. Therefore, there is, in my opinion, no reason for 

 generic separation of the two groups. The females of both are simOar. 



In Clarke's monograph (1958, vol. 3) not less than 11 species, 

 recorded under Olethreutes, are illustrated (see pp. 49, 51, 52). Photo- 

 graphs of the females of two species have been reproduced by Clarke. 



The genus may be redescribed as foUows: 



Species of moderate size, usually with a big round terminal spot 

 in the forewing, tropical species more or less green-tinged. Head 

 with loosely appressed scales, roughish on crown. Proboscis devel- 

 oped. Ocellus posterior. Antenna in male thickened, fasciculate- 

 ciliated, cUiations 1/2. Palpus moderately long, porrected, median 

 segment strongly dilated, triangular, terminal segment moderate, 

 exposed, slightly drooping, obtuse. Thorax with a slight double 

 posterior crest. Posterior tibia in male sometimes extremely dilated 

 and expanded by pencils, whorls or brushes of dense hairs of diverse 

 shape. Abdomen in male often normally haired and scaled, but 

 sometimes with a pair of long hair-pencils at the sides of each segment; 

 these pencils are implanted on segments 2-3, sometimes on more 

 segments, on distinct projecting papillae, or on raised oval fields. 



Forewing elongate-subtruncate, moderately broad, termen usually 

 slightly rounded, little oblique. Vein 2 from beyond 2/3, 3 from 

 angle, close to or rather distant from 4, 5 distant, 6 slightly diverging 

 from 5 towards base, 7 separate, to termen, 7 to 9 equidistant at 

 base, seldom 7 and 8 almost connate, 11 from before middle of cell, 



