394 PROCEEDINGS OF THE ACADEMY OF [June, A REVISION OF THE SPECIES OF THE GENUS NEMOBITJS (ORTHOPTERA . GRYLLID^) FOUND IN NORTH AMERICA NORTH OF THE ISTHMUS OF PANAMA. BY MORGAN HEBARD. The genus Nemohius is typical of the group Nemobiites, the other genera of which are more or less aberrant. The group Nemobiites stands at the head of the subfamily Gryllinae, which is the second division of the family Grylhdse. All of the species of Nemohius are of small size and are rather delicate in structure; their bodies are covered with long hairs. The plasticity in certain species, the lack of characters in the male genitalia and the great variability in size, wing length, and coloration, all combine to make the study of the genus difficult. Added to this, the many incorrect determinations and frequent synonyms have caused the task of correcting the nomenclature to be unusually complex. An effort is made in the present paper to afford sufficient information for subsequent workers to be able satisfactorily to determine material of either sex, but it is certain that, especially in the males of some species, no single specific character can be considered absolutely trustworthy, and careful consideration of all the specific differences must be made before a safe conclusion can be reached. The large series of different species before us show con-clusively that, where some character may be safely relied upon in a large series of the same species from one region, that character is often obscure or unreliable in series from other portions of the insects range and in consequence can only be used to supplement the com-bination of characters found in that species. Genus NEMOBIUS Serville. 1839. Nemohius Serville, Hist. Nat. Ins., Orth., p. 34.5. [Generic de-scription.] 1869. Argizala Walker, Cat. Dermap. Saltat. Br. Mus., I, p. 60. [Generic description.] 1874. Nemohius Saussure, Miss. Sci. Mex., Rech. Zool., VI, p. 380. [Key-to American species and descriptions of new species.] 1877. Nemohius Saussure, Melang. Orth., II, Fasc. V, p. 236. [Full generic description, key to species of the world and many descriptions of new species.]
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