Revision of trachyderines related to Sphaenothecus from North America with description of three new genera, and new species of Lophalia Casey, 1912, Mannophorus LeConte, 1854, and Ischnocnemis Thomson, 1864 (Coleoptera: Cerambycidae: Cerambycinae: Trachyderini) Author Eya, Bryan K. California Academy of Sciences 55 Music Concourse Drive, Golden Gate Park, San Francisco, CA 94118 USA text Insecta Mundi 2024 2024-07-26 2024 61 1 94 journal article 10.5281/zenodo.14662132 1942-1354 14662132 5671A77B-2ECB-445F-8F61-246A9E442CDE Key to species of Ischnocnemis Thomson, 1864 1. Larger species ( 11–20 mm ); elytra bicolorous, black with ivory vitta(e) or elytra testaceous and black with dark costae; each elytron with raised or glabrous subsutural costa or vitta and submarginal vitta or costa; metatarsomere 1 elongate, usually longer than tarsomeres 2 and 3 combined......... 2 — Smaller species ( 8–12 mm ); elytra concolorous, all black or metallic bluish; each elytron with presence of costa variable, either with single vague, non-elevated subsutural costa, or costa absent, or with raised subsutural and vague submarginal costae; metatarsomere 1 subequal to tarsomeres 2 and 3 combined........................................................................... 6 2(1). Each elytron with glabrous subsutural and submarginal vittae or costae, interspace with or without a vague costa; dorsum of antennomeres finely punctate without any visible signs of scaring; mesosternum excavated anteriorly; integument black............................................. 3 — Each elytron with a single, narrow, ivory subsutural vitta, submarginal costa vague; dorsum of antennomeres III to VI striate-punctate or canaliculate; mesosternum not excavated anterior or depressed in the middle; integument black with metallic greenish to bluish sheen ( Fig. 396–408 )............................................................................. I. edmundi Eya , sp. nov. 3(2). Integument with pubescence visible, elytra with short and suberect setae, sternum with golden and appressed pubescence; elytra with narrow subsutural and submarginal costae or vittae......... 4 — Integument glabrate, black with pubescence on dorsum and sternum obsolete, minute or very short; elytra with bright yellow subsutural vittae, and narrower submarginal costae showing variation in color with base usually yellowish to mostly dark and vaguely yellowish ( Fig. 346–358 )...........