Nelson (_op. cit._:45) stated that _S. a. frumentor_ "Differs strikingly from typical _aureogaster_ in having well-marked nuchal and rump patches of yellowish brown or rufous brown; the underparts gray or gray washed with rufous; tail heavier and more bushy; pelage softer.... Skull indistinguishable from that of typical _aureogaster_." I have examined 22 specimens from Jico, 7 from Las Vigas (the type locality), and one from 3 km. E Las Vigas, all in Veracruz. These include the type and paratypes of _S. a. frumentor_. Part (probably 7 specimens) of the series from Jico was referred by Nelson (_op. cit._:46) to _S. a. frumentor_ and he thought, or knew, these specimens to have been taken _above_ Jico. The remaining specimens labelled as from Jico were referred to _S. a. aureogaster_. I am unable to find fault with the characterization of _S. a. frumentor_ insofar as color or skull are concerned. I cannot verify to my own satisfaction the presence of "heavier" and bushier tail and softer pelage. The characters considered to be diagnostic of _S. a. frumentor_ are distributed in an interesting geographic pattern the genetic import of which is not wholly clear. One specimen (No. 23945 KU) of the two available from 3 km. SW San Marcos, Veracruz, a locality on the coast approximately 50 miles north of Las Vigas, is indistinguishable from topotypes of _S. a. frumentor_ except for slightly lighter-colored grizzled parts. The second specimen (No. 23946 KU) from the same locality, although a subadult in worn pelage, shows the color and striking dorsal pattern of _S. a. frumentor_ and the ventral color of _S. a. aureogaster_. The dorsal pattern of _S. a. frumentor_ is found also in the three specimens from San Carlos and Plan del Rio, Veracruz (Nos. 11082, 11083 and 8278), Chicago Nat. Hist. Mus., respectively. (The two specimens from San Carlos were referred to _S. a. frumentor_ by Elliot, Field Columb. Mus., Zool. Ser., vol. 8, Publ. no. 115:128, February 9, 1907.) Nevertheless, although the essential morphological characters of _S. a. frumentor_ occur sporadically in other populations, the animals from the higher elevations above Jico and Las Vigas are notably homogeneous, differ collectively from surrounding populations, and occupy a logical geographic range. Therefore _S. a. frumentor_ is retained as a tenable subspecies, and the animals from the vicinity of San Marcos, and from San Carlos and Plan del Rio are referred to _S. a. aureogaster_. Incidentally, Nelson (_op. cit._:45) remarks that he saw no melanistic specimens of _S. a. frumentor_. This is not strange because melanistic specimens could not be identified anyway. [Illustration: FIG. 1. Geographic distribution of _Sciurus aureogaster_. 1. _Sciurus aureogaster aureogaster._ 2. _Sciurus aureogaster frumentor._]