We here give Echinocoleus new ranking as a subgenus of Ptomaphagus. Ptomaphagus (Echinocoleus) accutus sp.nov. is described from the southeastern United States (Alabama. Georgia, Florida). It is the most plesiotypic member of a group in which till other species live in the western United States and (probably) adjacent Mexico. All are myrmecophilous with Pogonomyrmex and Aphaenogaster (= Novomessor) harvester ants. A phylogenetic analysis is given for the subgenus. The main synapomorphies of Echinocoleus, which are mostly interrelated with myrmecophily, are reduction of body length and broadening of elytra, reduction of antennal length, verticalization of mesocoxal insertion, reduction of mesosternal carina, body with a golden pubescense, and a pointed projection at the end of the spermatbeca.

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Persistent URL dx.doi.org/10.4039/Ent12993-1
Journal Canadian Entomologist
Peck, S, & Gnaspini, P. (Pedro). (1997). Review of the myrmecophilous Ptomaphagus, subgenus Echinocoleus (new status), of North America (Coleoptera: Leiodidae: Cholevinae: Ptomaphagini). Canadian Entomologist (Vol. 129, pp. 93–104). doi:10.4039/Ent12993-1