The 12 genera of the Thalycra complex are reviewed, diagnosed, and keyed. The group is related to the Pocadius complex (based on larval and adult morphology) and is characterized by the following adult characters in combination: body form elongate and convex, pronotal and elytral margins narrowly explanate, vestiture of setae relatively sparse, length of antennomere 11 smaller than 9 and 10 combined, and metacoxae approximate with a moderately narrow intercoxal process. Three genera are described as new: Pocadiolycra Kirejtshuk and Leschen, gen. nov. (type species: Pocadiolycra peruensis Kirejtshuk and Leschen, sp. nov.; P. guyanaensis Kirejtshuk, sp. nov.), Tagmalycra Kirejtshuk and Leschen, gen. nov. (type species: Tagmalycra ashei Kirejtshuk and Leschen, sp. nov.) and Thalycrinella Kirejtshuk, gen. nov. (type species: Neothalycra latitibialis Audisio and Kirejtshuk, 1983), The species Quadrifrons castaneus Blatchley, 1916 (= Cychramus zimmermani Horn 1879, new synonymy), Pocadionta dentipes (Grouvelle, 1898), and Pleuroneces montanus Olliff, 1891 are redescribed. Biological information is summarized for each genus while fungal host relationships are emphasized. Members of Thalycra Erichson, and possibly Quadrifrons Blatchley, are specialists on hypogean fungi while the related genera Pocadiolycra and Tagmalycra are specialists on Agarieaceae. New New Zealand records for the species Thalycrodes australis (Blackburn) are provided.
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