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The authorship and type species of the genera Acentroptera and Metazycera are reviewed. The correct author of Acentroptera is Guérin-Méneville, 1844; Acentroptera dejeani Guérin-Méneville, 1844, is here designated as the type species. Metazycera is the correct spelling of the genus described by Chevrolat, 1837; the type species is Hispa trimaculata Olivier, 1808, by monotypy; Metaxycera Baly, 1864 is an unjustified emendation.
The generic name Brachycoryna was first published by Guerin-Meneville (1844) who at that time also described B. pumila which was the only included species (type species by monotypy). The locality data given by Guerin's material is "Carthagene" (Cartagena, Columbia). Guerin correctly receives authorship of Brachycoryna since a single combined description of a new genus and new species published before 1930 is considered an "indication" for each name (Intern. Code 2001. Nomen., Article 12). Some authors (Weise, 1911 a,b; Papp, 1953) had assigned authorship to Baly (1885) who published the first generic description and reported B. pumila from Mexico, Guatemala, and Nicaragua. There have only been two other generic descriptions published: Weise (1911b) and Monros and Viana (1947).
The only lists of Hydrophiloidae (Coleoptera: Hydrophilidae, Helophoridae, Hydrochidae, and Hydraenidae) from the mid-Atlantic region are Ulke (1902) who reported 46 species from the District of Columbia and Matta (1974) who presented keys and short descriptions for the 49 aquatic species of Hydrophilidae of Virginia. The following checklist records 103 species (75 aquatic) from Maryland. Comparable lists of aquatic species for other states are as follows: 53 species recorded from Florida by Young (1954); 20 species recorded from Ithaca, New York by Swenson (1982); 67 species from North and South Carolina by Brigham (1982); and 47 species from Illinois by Wooldridge (1967). Hatch (1965) recorded 128 species (of all habitats, 102 aquatic) from the Pacific Northwest; and 88 species (67 aquatic) reported from New York by Leng (1928).
The only published checklist of the Hydradephaga from the Maryland area is Ulke (1902) who records 65 species from the District of Columbia. The present paper lists 121 species as occurring in Maryland. Comparable lists for other states are as follows: Young (1954), 120 species from Florida; Folkerts (1978), 120 species from New York; and Brigham (1982) and Sanderson (1982), 115 species from North and South Carolina. Some of the identifications are questionable until generic revisions are completed. This is especially true of Hydroporus and Gyrinus.
A key to the subgenera of Anisostena Weise is presented. Apostena new subgenus is erected from angustata Pic and missionensis Monros & Viana; bondari Maulik and breveapicalis Pic are transferred from Anisostena s. str. to Anisostena (Neostena). Keys to the species of the subgenera Neostena and Aposostena are presented.
Type species designations are reviewed and discussed far six New World Hispinae genera. Valid designations are: Oediopalpa cyanipennis (Fab.), Homalispa (Homalispa) batesii Baly, H. (Xanthispa) cimicoides (Guerin), Demotispa pallida Baly, Cephaloleia nigricornis (Fab.), and Coraliomela brunnea (Thunberg).