"The name T. coendea was given by Heller in 1861 to specimens of this species in which the blue tinge, found to a greater or less extent in many individuals, was very conspicuous. The intermediate cases, however, between pure brown examples and those in which blue predominates, are so numerous, and form such a complete series, that it is impossible to keep coendea even as a varietal name."
(Borrodaile 1903)
