Sept. 1896.] Skinner: Study of N.American Butterflies. 107 mint Valley, Cal. I have also seen specimens from Mexico (Sumi-chrast), near Mescico, Me'x. (Palmer), and from Jalapa, Orizaba and Menanitlan, Mex. (L. Bruner). Nemobius carolinus. Netjiobius carolinus Scudder ! Proc. Bost. Soc. Nat. Hist. XIX, 36 ( 1877). Cyrlo^ip/ms variegatus Bruner ! Publ. Nebr. Acad. Sc. Ill, 32 (1893). Neviobius affinis Beutenmuller ! Bull. Amer. Mus. Nat. Hist. VI, 249. 267, PI. 5, fig. II (1894). No macropterous form is known. There is considerable variation, apparently independent of locality, in the fineness of the denticulation of the blades of the ovipositor. Specimens before me come from Jackman, Me. (Harvey — A. P. Morse), Norway, Me. (Smith— Mus. Comp. Zool.), Blue Hill, Milton, Mass. Sept. (S. Henshaw), Adams, Mass. (Morse), South Kent and Canaan, Conn., (Morse), New York (Beutenmuller), Ithaca, N. Y. (Morse), Orange, N. J., (Beutenmuller), Maryland (Uhler), Vigo Co., Ind. (Blatchley), District of Columbia and Virginia (Bruner), North Carolina (Morrison, Henshaw), Lake Worth, Fla. (Mrs. Slosson), Lake Okeechobee, Fla. Palmer), New Orleans, La , (Shufeldt— U. S. Nat. Mus.), Texas (Boll), Texas ''Flying to light" (Belfrage), Lin-coln, West Point and South Bend, Nebr. (Bruner). IMPRESSIONS RECEIVED FROM A STUDY OF OUR NORTH AMERICAN RHOPALOCERA. By Henry Skinner, M. D. I wish to speak of specific values— a subject which has always agi-tated the scientific mind, and perhaps always will in the future. My excuse for writing on such a subject is the fact that I believe the proper kind of studies will enable us to approximate an absolute specific value, or at least get much nearer the truth than is now shown by a study of our catalogues and lists of species. I do not care to go into the trite subject as to what is a species, but think it only fair to give my own view, or that which I should follow in the rearrangement of our species. I look upon the species as the unit of classification, and therefore it is all important to have the basis of classification as scientifically accurate as possible. I would divide the definition of species into two heads:
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