Specimens, referred to _spadix_, from northern Iowa, are instructive as showing what happens where the ranges of _noveboracensis_, _primulina_, _spadix_, and perhaps _longicauda_, meet. No. 47167, Univ. Mich. Mus. Zoöl., a nearly adult female, taken on November 22, 1915, at Island, Clay County, and in process of assuming a brown winter pelage, retains enough of the dark summer pelage to show that the color was slightly lighter than average for _spadix_. The color pattern, white lips, and extension of light color of the underparts onto the feet, agrees with _spadix_ or _longicauda_ as does also the long tooth-row. The overall length of the skull is intermediate between that of _spadix_ and _primulina_. The proportions of the anterior part of the skull and of the tympanic bullae resemble those found in _primulina_. A subadult male skull only, no. 123846, American Museum of Natural History, from Webb, Clay County, shows approach to _primulina_ in the narrowness of the rostrum. A young male from Ruthven, Iowa, no. 48340, Univ. Michigan, has a large skull approaching in size that of _spadix_, has the _longicauda-spadix_ type of light-colored underparts and color pattern, and is slightly darker above than true _longicauda_. Another subadult male in the white winter coat from Palo Alto County, no. 35756, Univ. Michigan, has a large skull, which shows approach to _primulina_ in its narrowness anteriorly and in some other features. Although the tail is of moderate length, the body is large as in _spadix_ or _longicauda_, and the length of the hind foot suggests _spadix_ or _longicauda_. A subadult male, no. 425a, Iowa State College, from Manson, Iowa, in brown winter pelage, agrees with _primulina_ in the restriction of the area of the light color of the underparts and in less expanded zygomatic arches. The teeth are intermediate in size between those of _noveboracensis_ and _primulina_ on the one hand and those of _spadix_ and _longicauda_ on the other. In other respects it agrees with, or is more nearly like, _spadix_.