Cymatodera

Chapman, Eric G., Leavengood, John M. & Dupuis, Julian R., 2025, The Cleridae and Thanerocleridae of eastern North America, with illustrated keys, updated distributions, and special emphasis on the Kentucky fauna, Zootaxa 5639 (1), pp. 1-88 : 21-22

Key to species of Cymatodera ( Tillinae ) in eastern North America

1. Elytra with three irregular pale (light brown to yellow) fascia ( A)............................................... 4

1’. Elytra either unicolorous ( C, D) and sometimes with a pale midelytral fascia, or colored as in ( B)...................... 2

2(1’). Elytra tricolorous, the basal third reddish, followed by a yellowish fascia with irregular margins, the apical portion black with yellowish maculae of variable size ( Couplet 1: B); only known from Highlands County, Florida.................................................................................................... Cymatodera floridana Barr

2’. Elytra unicolorous ( Couplet 1: C) or bicolorous with 2 different shades of brown.................................. 3

3(2’). Prothorax brown (may have lighter and darker brown areas); body and elytra brown (elytra may have lighter and darker brown regions as well; Couplet 1: D)...................................................... Cymatodera inornata (Say)

3’. Prothorax usually mostly reddish-yellow, starkly contrasting with the remainder of the body, some specimens with yellow reduced dorsally and on rare specimens with yellow only on prosternum anterior to the procoxae; elytra black to bluish-black ( Couplet 1: C)................................................................... Cymatodera bicolor (Say)

4(1). Elytral apices yellow ( A)........................................................... Cymatodera sirpata Horn

4’. Elytral apices dark ( B, C)............................................................................... 5 5(4’). Venter of terminal abdominal segment smoothly rounded ( A)—females (cannot be reliably identified further).......................................................................... Cymatodera undulata (Say) or C. wolcotti Barr

5’. Venter of terminal abdominal segment deeply excavated ( B, C) males............................................ 6 6 (5’). Apex of 6 th abdominal segment evenly rounded ( A).................................... Cymatodera undulata (Say)

6’. Apex of 6 th abdominal segment distinctly bilobed ( B)..................................... Cymatodera wolcotti Barr