THERETKA. 



427 



Glossostigma spathulatum Arn. 5 family Scrophulariacese ; Boer- 

 havia repens Linn.. B. diffusa Linn., family Nyctaginacese, and 

 other plants. The moth comes to light freely, and sometimes 

 visits flowers before dark. We once saw hundreds come on 

 board a ship sailing between Aden and Bombay during 

 a cyclone. 



Genus THERETRA Hubner. (Fig. 110). 



Hiibner, 1822, p. 135 (part.) ; Roths. & Jord., 1903, p. 762. 

 Hathia, Moore, 1882, p. 19. 



Genotype : nessus (Drury). 



Imago. — " <£§. Second segment of palpus on inner side 

 with apical tuft of scales directed ventrad ; apex of first segment 

 (fig. 110 D, E) densely and regularly scaled on inner side, with 

 cavity at apex on outer side " (Roths. & Jord., 1903, p. 762). 



The moths vary in size from very large (T. nessus) to rather 

 small (T. griseomarginata) species. The upperside is brown or 



Fig. 110.— Tkeretra Hubn. 

 T. nessus (Drury), J, harpe ; B, penis-sheath. C, T. clotho (Drury), $, 

 penis-sheath, right side. D, T. latreillei lucasi (Walk.), <$, palpus, 

 external aspect (gr, cavity in 1st segment) ; E, palpus, first seg- 

 ment, apex from inner side ; F, harpe ; G, penis-sheath, dorsal 

 side. H, T. alecto (Linn.), $, penis-sheath. I, T. lycetus (Cram.), $, 

 penis -sheath, right and left sides ; J, $ vaginal plate. 



