The skull of the female from Ollantaytambo and that of the male from Marcapata have teeth equally as small as do the specimens from Lake Junín.
The skin alone, no. 194328, from Ollantaytambo has the color of the underparts extended over the entire upper sides of the forefeet. The male from Marcapata has less of this color on the forefeet and is in this respect intermediate between the specimens from Lake Junín and the one from Ollantaytambo.
In size of teeth the female, type specimen of M. jelskii, from Cutervo, shows an approach to the larger-toothed weasels of the northern part of the range of macrura.
The specimens in the Riksmuseum from the vicinity of Quito, Ecuador, have been rather fully described by Lönnberg (1921:11-17) and need little comment here, except to say that they show, as he suggested, that the weasel of the Temperate Zone of Ecuador is an intermediate link between M. f. macrura and M. f. affinis.
The adult female and juvenal male labeled as from Ambato have little left of the skulls except some of the teeth and the assignment of the specimens to the subspecies macrura is made mainly on geographic grounds. These two specimens probably are part of the shipment of birds and mammals of which Chapman (1926:703) speaks as follows: "A small collection of native-made skins purchased by the American Museum from a commission merchant in New York City as from 'Ambato' proved to be from the eastern slope of the Andes." Another skin in the same Museum, labeled by a native collector as from "Baeza arriba" [= above Baeza] is so dark colored and has the color of the underparts so much restricted, as to suggest that it belongs to the race aureoventris. Possibly, therefore, it was taken not at Baeza, Ecuador, which I find to the eastward of Quito at 77° 55' W and O° 25' S, but at some place of the same name on the Pacific Slope, unless the locality has been altogether wrongly recorded on the label. If the specimen was taken near the Baeza above referred to, then it gives evidence of an unnamed race of Mustela on the eastern slope of the Andes, characterized by its dark color. Unfortunately the specimen is young and its skull therefore offers insufficient basis for the judging of its subspecific relationships.
Other specimens, in the British Museum of Natural History, recorded as taken "near Quito" and here tentatively listed under macrura, mostly, include specimens so dark colored as to lead me to think they came from country, lower than Quito, adjacent to the range of aureoventris.
Nematodes taken from the right frontal sinus of no. 562 from Junín proved to belong to the superfamily Oxyuriodea according to Professor W. B. Herms and Mr. O. L. Williams, who have independently identified them. Because these worms had been dried fifty-five years in the mounted specimen and were later boiled in cleaning the skull, a more accurate determination was impossible and whether or not they pertain to the same species found in North American weasels cannot be said. Of 18 adult skulls examined for this type of infestation, 13 were found affected as judged by the evident malformation of the frontal region.
Specimens examined.—Total number, 74, arranged by localities from north to south and unless otherwise indicated in the American Museum of Natural History.
Ecuador: Ibarra, 6600 ft., and 7500 ft., 2[7]; San Antonio, 8000-8500 ft., 5 mi. N Quito, 4 (2[7], 2[78]); Nono, 10000 ft., 1; Mindo, 1[78]; Zambiza, 8000-8100 ft., NE Quito, 4 (2[78], 2[95]); Carapungo, 8500 ft., NE Quito, 1[78]; Panecillo, 10000 ft., near Quito, 2[78]; Guapulo, 8800 ft., 3 mi. E of Quito, 1[78]; Pichincha, 10500 ft., and 12000 ft., 2 (1[78], 1[95]); San Ignacio, 11500 ft., Pichincha, 1; Santa Rosa, 9600 ft., Río Pita, 2; near Santa Rosa, 9000 ft., 1; Río San Rafel, 9000 ft., 1; N side Quito, 9000 ft., 1[78]; Quito, 1[4]; near Quito, 5[7]; Nára Papallacta, 11000 ft., 1[78]; below Papallacta, 9000 ft., 1[78]; Chillo Valley, 1[78]; "Hacienda Hda," 10000 ft., Pintag, Valencia, 1; Baeza arriba, 1; Ambato, 2; San Francisco, 8000 ft., E of Ambato, 1; Chunchí, Pagma Forest, 6400 ft., 1[1]; Canar, 2600 M., 1[7]; Malletura, 7600 ft., 1; Contrayerbas, 11000 ft., 1; Sisig, 8500 ft., 3[7]; El Chiral, 1; Almor, 1; Guainche, 3200 ft., 1; no locality more definite than Ecuador, 4[95]; "Received from Quito," 1[7]; Quisaya, 6000 ft. (locality not found), 1[7]; La Carolina (locality not found), 1[78].
Perú: La Lejía, 1; Huancabamba, 4 (2[75]); Cutervo, 9000 ft., 1[73]; Condechacha, 7000 ft., Río Utcubamba, 1[7]; San Pedro, 8600-9400 ft., S of Chachapoyas, 1; Celendín, 1[7]; Junín, 2[73]; Yana Mayo, Río Tarma, 1[7]; Ollantaytambo, 9000 ft., 3 (1[7], 2[91]); Ocabamba, 1[7]; Anta Cuzco, 3400 and 3500 M., 2[4]; Marcapata, 1[91].