Key to species of male Zeadolopus of the continental United States and Canada

1. Abdominal sternite III with two large foveae at anterior margin...... Z. bifoveolatus Daffner

– Abdominal sternite III without large foveae ................................................................................ 2

2(1). Paired apices of median lobe of aedeagus short and rounded (Fig. 15); parameres broad .......... .............................................................................................................. Z. rubricornis Daffner

– Paired apices of median lobe inwardly curved (Fig. 12, 14); parameres narrower .................... 3

3(2). Metatibia more robust, widened near middle; inverted internal sac with a broad, fan-like structure apically (Fig. 12) ...................................................................... Z. egenus (LeConte)

– Metatibia more slender, not widened near middle; inverted internal sac without a broad, fanlike structure (Fig. 14)..................................................................... Z. oklahomensis Daffner