New Genera and Subgenera from the Genus Deltocephalus. a Study of the Internal Male Genitalia of the American Species and Their Bearing upon Taxonomy

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