Abstract
Some two years ago the senior author constructed and published a key to the North American species of Deltocephalus, using external characters in an attempt to form a working basis for this group. During this study several problems in taxonomy and relationship presented themselves and had to remain unsolved for the time without an examination and detailed comparative study of internal characters. The present treatment, discussion and figures, is an attempt to throw more light upon these relationships by presenting the structures and data which will assist in solving some of these problems and establishing certain taxonomic relationships among these species.
Published Version
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