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There are four previously described species of the genus Echinohelea Kieffer in the Western Hemisphere. The following species are described as NEW SPECIES: aitkeni from Brazil, blantoni and panamensis from Panama, jamaicensis from Jamaica, and leei and neotropica from Colombia. Echinoideshelea NEW SUBGENUS is described with E. aitkeni n. sp. as type-species. The hitherto unknown pupal stage of the genus is described fro E. lanei Wirth, which was reared from a pond margin in New York, USA. Diagnoses are presented for the genus Echinohelea and the subgenus Echinoideshelea, a key is given for the identification of the 11 species, descriptions or diagnoses are given for all species, and diagnostic characters of the male genitalia are illustrated.
Atrichopogon Kiefer, subgenus Rostropogon Remm, is a junior synonym of the subgenus Lophomyidium Cordero (NEW STATUS, NEW SYNONYMY). Monohela ocumare Ortiz from Venezuela is transferred to Atricopogon (Lophomyidium) (NEW COMBINATION). The Holarctic species Atrichopogon polydactylus Nielsen is a junior synonym of A. fusculus (Coquillet), a widespread and common species previously reported from only the Western Hemisphere. Four Nearctic species are described as NEW SPECIES: A. jamnbacki from salt and brackish marshes along the Atlantic coast from Nova Scotia to North Carolina; the following freshwater species A. deyrupi from southern Florida; A archboldi, from southern Florida, Texas and California, and southward well into the Neotropical Region and A. borkenti, from western Canada. The larvae of A. (Lophomyidium) are found on wet wood, soil, and stones in marshy habitats. Adults of A. fusculus have been observed feeding on insect carrion in spider webs.