This paper brings together and summarizes available data on the genus Ghilianella in the Americas. Descriptions of the genus and subgenera are given, as well as a checklist of the 88 known species. The keys differentiate the 80 species of which specimens were available for study; they are expansions of those published in 1925 by McAtee and Malloch (the fine work of these authors has aided me greatly in the completion of this paper). Among the species treated in the following pages, 15 are described as new, 1 is redescribed, and the ''hypotypes" of 7 others are described. For 32 previously described species, notes are given on specimens examined, and the paper closes with notes on the 8 species not included in the keys. In the illustrations (see pp. 407-421) I have tried to keep together similar structures from the various species so that a comparison of them could be made.In this paper, the term "hypotype" is used to refer to a specimen herein described and belonging to the opposite sex of the corresponding holotype described by another author. Additional specimens of the hypotype are called "parahypotypes." Thus, I have followed the terminology suggested by Frizzell (1933).•College of Agriculture and Mechanic Arts, Mayaguez, Puerto Rico.
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The new neotropical harpactorine genus Orbella is described and three new species are assigned to it. It is allied to Atrachelus Amyot and Serville and Corcia Stål. The males of Orbella lack claspers. A key is provided to separate these three genera.
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