LIBRARY AUG 1 5 1955 HARVARD A NEW LOUISIANA COPEPOD RELATED TO DIAPTOfyllMNWIV (AGLAODIAPTOMUS) CLAV1PES SCHACHT (COPEPODA, CALANOIDA) MILDRED STRATTON WILSON, Arctic Health Research Center, U. S. Public Health Service, Anchorage, Alaska Study of new collections from small bodies of fresh water in Louisi-ana continues to reveal species of copepods new to science as well as species as yet unrecorded for the state. The present report describes the fourth new Louisiana species to be added recently to the list of North American diaptomid copepods. Others are Diaptomus louisi-anensis M. S. Wilson and Moore (1953a), D. bogalusensis M. S. Wilson and Moore (1953b) and D. moorei M. S. Wilson (1954). It is also of interest to note that the type localities of two other diaptomid copepods are in Louisiana. Of these, D. conipedatus Marsh (1907) has not yet been reported from outside the state. D. dorsalis Marsh (1907) is now known to be fairly common in the southeastern states and also to occur in the West Indies. Kiefer (1936) recorded it from Haiti as a new species, D. proximus. Kiefer's description is more detailed than that of Marsh and comparison of it with type material of dorsalis in the United States National Museum shows that differences noted by Kiefer were omitted from the original descrip-tion. The species also occurs in Puerto Rico having been identified by myself in a U. S. National Museum collection from Guanica Lake. D. dampfi Brehm (1932, 1939) from Lake Peten, Guatemala, is closely allied to dorsalis and may or may not be synonymous. Brehm's descriptions are too incomplete to allow for a satisfactory decision on the basis of his papers alone. The occurrence of dorsalis throughout the southeastern United States and the West Indies, and its possible presence in Central America, suggests that these new species should be looked for through-out this relatively little known area. Neither the recently discovered species nor the older conipedatus should be considered endemic to Louisiana on the basis of present knowledge. Although there may well be extreme localization of some species in the southeastern part of the continent, recent studies have extended the range of species that for many years were considered localized or rare, and no con-clusions should be drawn until an intensive survey of the region has been made. One of the new species {moorei) is already known from eastern Texas. Anyone studying Louisiana diaptomids, should also note the new species recently found in neighboring areas: D. sinuatus Kincaid (1953), a form closely allied to bogalusensis, from Panama City, Florida; D. marshianus M. S. Wilson (1953) from Lake Jackson, Florida; and D. texensis M. S. Wilson (1953) from Aransas County, Texas. Kiefer (1936: 309) summarized the literature dealing with the
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