Iphthiminus

Gardiner, Rebekka M. & Pollock, Darren A., 2015, Revision of the Nearctic species of the genus Iphthiminus Spilman (Coleoptera: Tenebrionidae), Zootaxa 4048 (3), pp. 352-391 : 356

Key to Nearctic species of Iphthiminus

1. Pronotal disc smooth to finely punctate, becoming more distinctly punctate laterally; elytra with shallow, uniform small and round punctation, interstrial punctures shallow to absent; southern California, Arizona, New Mexico, eastern Texas, Colorado, Utah and southern Wyoming............................................................... .. I. lewisii (Horn)

1’ Pronotal disc finely punctate to rugose, always rugose laterally; interstrial elytral punctation uniform and pronounced; widely distributed in Canada, Oregon, Washington, Idaho, California and northeastern US.................................. 2

2. Pronotum moderately rugose, lateral edges of pronotum moderately serrated, punctures not confluent; British Columbia, California, Pacific Northwest............................................................. I. serratus (Mannerheim)

2’ Pronotum heavily rugose, forming ridges and nodes. Punctures often confluent. Lateral edges of pronotum distinctly serrated; Canada (Alberta, Manitoba, Ontario, Quebec, and Nova Scotia), and northern United States (Montana, South Dakota, Minnesota, Wisconsin, Michigan, Virginia, Pennsylvania, New York, Vermont, New Hampshire, Connecticut, Massachusetts, and Maine.).............................................................................. I. opacus (LeConte)