ADDITIONAL NOTES ON THE DEVELOPMENT OF THE ARGULID.E, WITH DESCRIPTION OF A NEW SPECIES. H}^ Charles Branch Wilson, Department of Biologi/, Slate Xormal School, WestfieUl, Massachusetts. INTRODUCTION. This fifth paper in the series based on the Collection belonging to the U. S. National Museum gives for the first time an account of the newly hatched larva? of two of our conunon Argulids, one, Argtdus fanduli^ a salt-water form, and the other, Argalus macu/o.m.s, fovind only in fresh water. It also gives a description and figures of the male of Ai'c/ahis eafo,^-t(mu\ which is the oldest of our North American species. In each of the three instances the form here described is the onl}" one needed to complete a full account of the species, including its life history. We have now, therefore, six native species whose entire development is known, two infesting marine fishes and the other four those inhabiting fresh water. For the opportunity of obtaining the present material the author is indebted again to the courtesy and assistance extended by the Bureau of Fisheries. TheAarya oH Arg (this /"uvdH/i was obtained during the summer of 1905 while the author was working as a temporary assist-ant at the station of the Bureau of Fisheries at Beaufort, North Carolina. The other two forms were obtained during the present summer, 1906, while holding a similar position at Lake Maxinkuckee, Indiana. Grateful acknowledgment is here made for these favors. I. THE MALE OF ARGULUS CATOSTOMI Dana and Herrick. This was the first American Argulid to be described. For this reason and also because of the excellent figures given by Dana and Herrick with their original description, it was at once accepted by European scientists and has taken the same place in America that is occupied by Aigulus foliaceux in the European fauna. But Dana and Herrick did not secure any specimens of males, and consequenth' their species diagnosis was based entirely upon females. This has been the Proceedings U. S. National Museum, Vol. XXXII -No. 1 531 . 411
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