Additional intergrades with _noveboracensis_ are available from eastern Iowa. Of five specimens from Hillsboro, Iowa, two males and a female have tympanic bullae like those of _primulina_ but the other two males have bullae like those of _noveboracensis_. The female is smaller than _primulina_ and in this small size and in general configuration of the skull, viewed dorsally, is more nearly like _noveboracensis_. As a whole, the population averages almost exactly intermediate. The same is true of 3 males and one female from Muscatine. The subadult male from Keosaqua, to my eye, resembles _noveboracensis_ in the greater length of the skull anteriorly to the postorbital processes, and in the relative narrowness across the mastoidal region, but otherwise is more like that of _primulina_. Two males and one female from Tipton, although in each instance variously intermediate, are as a whole nearer _primulina_, No. 2865, Coe College, male adult, from Cedar Rapids, has characters of the three races, _spadix_, _noveboracensis_ and _primulina_. In the skull, the width suggests _spadix_, the narrow mastoid region, _noveboracensis_, and the tympanic bullae are as in _spadix_ or _primulina_. One male, no. 12, Coe College, from Dubuque, is as narrow across the mastoid region as is _noveboracensis_ although the bullae are well inflated as in _primulina_. The skull, without corresponding skin, of a female, no. 140a, Iowa State College, from Green's Island, also resembles _noveboracensis_ in narrowness of the mastoidal region, and in small size of skull, but in larger teeth, broader tympanic bullae, and sagittal crest is referable to _primulina_. Of two females from Vinton, one adult is typical of _primulina_ but the other, a subadult, is practically indistinguishable from female _noveboracensis_, from Ann Arbor, Michigan. Three males from Vinton agree well with _primulina_ except that the interorbital region is wider than average and thereby suggests _spadix_ or _noveboracensis_. An adult female from New Hartford also is typical of _primulina_ except for the broader interorbital region. Three males from Fayette are typical of _primulina_.