Keith R. Kelson, The Subspecies of the Mexican Red-Bellied Squirrel…
“ Actually, the only concrete evidence of geographic variation that I can detect in these animals is a slight increase southwardly in the frequency and degree of melanism, a kind of variation that is unworthy of taxonomic recognition in this species. ”
Keith R. Kelson, The Subspecies of the Mexican Red-Bellied Squirrel…
“ Sciurus aureogaster varies greatly in intensity of color and in color-pattern. Fully 30 per cent of the specimens examined are in some degree melanistic and approximately 20 per cent of them are completely so. Others are more or less brown; the brown dulls the usually rufous parts. In many specimens this brown is well distributed even in the otherwise grizzled areas; in some specimens it is evenly distributed and in others it is in patches. Indeed, scarcely any two "normally" colored specimens are alike. ”
Keith R. Kelson, The Subspecies of the Mexican Red-Bellied Squirrel…
“ Miniatitlan, Veracruz, was designated by Nelson as the type locality of S. a. hypopyrrhus because Wagler's description of the type of that subspecies fitted so well certain of Nelson's specimens from that place.Sciurus a. hypopyrrhus was said by Nelson (op. cit.:43 and 44) to differ from S. a. aureogaster in darker color, thinner pelage, much stiffer and more shining dorsal hairs, slenderer tail with black predominating, larger and proportionately narrower skull with larger auditory bullae, each bulla being "slightly constricted just in front of middle." ”
