The name Mustela aureoventris Gray has been regarded by most authors as preoccupied by Mustela auriventer Hodgson (1841:909). However, the writer is not of this opinion and agrees with Thomas (1920:224) that "The name aureoventris is not invalidated by the auriventer of Hodgson, as, apart from 'one-letterist' differences, its first half comes from the adjective aureus, while Hodgson's name is based on the substantive aurum, so that not only the spellings but the derivations are different." The spelling of Gray's name should be aureoventris for this is the spelling in the original description which in pagination precedes the colored plate of the animal that is labeled Mustela aureoventris. Putorius brasiliensis var. aequatorialis Coues (1877:142) is the only name known to the writer that has been proposed as a substitute for Mustela aureoventris Gray.

Thomas (1920:224) treats Mustela macrura Taczanowski as a synonym of Mustela aureoventris Gray. Allen (1916:101) also treats the two names as applying to the same kind of weasel but regards aureoventris as preoccupied and therefore uses the name macrura. Taczanowski's original description (1874:311) and plate of Mustela macrura indicate an animal that is lighter colored than M. f. affinis. Gray's original description (1864:55) and plate of aureoventris indicate an animal that is darker colored than M. f. affinis. Indeed Gray (1865:115) in speaking of the type of aureoventris as compared with an adult from New Granada [= Colombia] that probably later became the type specimen of Mustela affinis, states: "The young from Quito is much darker than the adult;. . . ." Comparison of the plates accompanying the original descriptions of aureoventris and macrura well illustrate the difference stated in the written descriptions. My examination of the type specimens of M. macrura and M. f. aureoventris shows them to have been fairly accurately portrayed in the plates accompanying the original descriptions. Accordingly the two names are used for the two kinds of animals which appear, however, to be only subspecifically distinct.

Comparison of Gray's plate (1864, pl. 8) with the available specimens from South America indicates that the name aureoventris is based on an individual that is lighter colored than no. 34677 Amer. Mus. Nat. Hist., from Gualea, Ecuador, but on one which resembles no. 34677 more than it does the lighter-colored specimens from the Temperate Zone of Ecuador and northern Perú. Because Quito, Ecuador, is in the Temperate Life-zone and because the available specimens from this zone in Ecuador and northern Perú are distinctly lighter colored than Gray's plate representing the type of aureoventris shows this specimen to be, it is judged to have come from an altitude lower than that of Quito (9350 feet, according to Chapman, 1926:717); probably it came from the Subtropical Life-zone of Ecuador. Indeed Gray (1864:55) did not say that the specimen was collected or obtained at Quito but that it was ". . . received from Quito. . . ." Chapman (1926:717) has pointed out that Quito, since 1846 has been the distributing point for bird skins which specimens ". . . come from the vicinity of the city, from the 'Napo' region on the Amazonian slopes of the Andes, and from Nanegal, Gualea, and other localities on the Pacific side rarely below the Subtropical Zone." It is also pointed out that only some of the specimens are labeled with their approximate place of capture and that even then these localities cannot be accepted as definite; they indicate mainly whether the specimen is from the eastern or western side of the Andes.

The above mentioned considerations and information gained by study of the specimens cause me to think that the type is an intergrade tending toward the lighter-colored Mustela f. macrura of the Temperate Zone although sufficiently dark to be referred to the dark subspecies represented by no. 34677 Amer. Mus. Nat. Hist., from Gualea, Ecuador.

The skull of no. 34677 shows no infestation of the frontal sinuses by parasites.

Specimens examined.—Total number, 3, as follows:

Ecuador: Gualea, 1, Amer. Mus. Nat. Hist.

Colombia: 8325 ft., Munchique, 1, Amer. Mus. Nat. Hist. In the British Museum of Natural History, the type, (1).

Mustela frenata helleri Hall

Long-tailed Weasel