PLUME-MOTHS-OF-CEYLON. 
17 
although I am unable to perceive any distinguishing characters 
between the male genital armatures of tengstroemi and rubrodactylus , 
in both of which forms this latter structure is highly complex and 
characteristic. In spite of the similarity in the genitalia, however, 
the difference in habitat appears sufficient to secure asyngamy. 
Observation .—Zeller named this genus Deuterocopus, giving the 
derivation of the name, and this is obviously not a misprint as the 
same spelling is seen on pages 319 and 415 of Volume VI. of ‘ ‘ Linnsea 
Entomologica.” Some later authors however ( e.g., Hofmann, 
Deutsche Ent. Zeit., 1898, p. 329; Pagenstecher, Zoologica, 
XXIX., p. 241) have altered Zeller’s name to Denteroscopus. This 
latter spelling is quite inadmissible, since a generic name, once 
published, is inviolable, except where it is a mere printer’s error, 
for which there is evidence. 
D 
7(6)09 
