Description of the new genus Tarsobaenus and three new species from Costa Rica (Coleoptera: Cleridae: Clerinae: Hydnocerini).

The new genus Tarsobaenus and three new speciesTarsobaenus letourneauae, T. piper and T. hansoniare described from Costa Rica. Tarsobaenus is distinguished by the broad, subulate form of the plical excavation along the elytral suture, the lower margin of which is modified into a broad flattened flange; serrulate apical elytral margins; and the conspicuously large, shiny body. Two of the species are associates of Piper plants and their pharaoh ant symbionts. We provide a key to the three species of Tarsobaenus.

New species of Mutillid Mimicking Enoclerus Gahan (Coleoptera: Cleridae: Clerinae) from Mexico and Central America.

Six new species of Enoclerus are described: E. delusus n. sp. from Costa Rica and Panamá, E. incanus n. sp. from México, E. zip n. sp. from México and El Salvador, E. reductesignatus n. sp. from Panamá, and E. citrinifrons n. sp. and E. philogenes n. sp. from Costa Rica. The new species are hypothesized to participate in a Batesian mimicry complex with boldly marked diurnal mutillid wasps as their model. Enoclerus crabronarius var. deletus Wolcott is elevated to species rank as E. deletus Wolcott new status. The identity of E. crabronarius is discussed.

Four new species of Cymatodera Gray from central and southern Mexico (Coleoptera, Cleridae, Tillinae).

Four new species of Cymatodera are described from Mexico: Cymatoderatortuosa Burke & Rifkind, sp. n. from Hidalgo and Tamaulipas; Cymatoderaortegae Burke, sp. n. from Colima, Jalisco and Michoacan; Cymatoderagerstmeieri Burke & Rifkind, sp. n. from Chiapas; and Cymatoderamixteca Burke & Rifkind, sp. n. from Puebla and Guerrero. Male genitalia and other characters of taxonomic value are illustrated.

New species of Cymatodera Gray (Coleoptera: Cleridae: Tillinae) from México and Central America, with notes on others.

Nineteen new species of Cymatodera Gray are described: C. mexicana, C. cicatricula, C. matehualacaligoides, C. brailovskyi, C. durangoensis, C. monticola, C. paucipunctata, C. anulata, C. christina, C. copei, C. oxchuc, C. merickeli, C. romeroi, C. cellulosa, and C. acutipennis from México; C. doda from México, Nicaragua and Costa Rica; C. carinipennis from México and Guatemala; C. rileyi from México, Honduras, and Belize, and C. wilsoni from Costa Rica. These species are figured, along with the type of C. kolbei Schenkling, and a lectotype is designated for the latter. I include a brief discussion on the prevalence and evolution of brachyptery in Cymatodera.