. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DIMORPHISM IN BLISSUS LEUCOPTERUS. 333 joined the Mississippi Valley branch in northern Ohio and around the Great Lakes. The short-winged form, so far as known in America, is con- fined to the ocean coasts and the immediate vicinity of the Great Lakes. The vast interior region from Central America to Mani- toba abounds with only the long-winged form. If Webster's theory is the correct one, we can scarcely escape the conclusion that the short-winged form originated in the re- gions where it is at present found. No short-winge
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DIMORPHISM IN BLISSUS LEUCOPTERUS. 333 joined the Mississippi Valley branch in northern Ohio and around the Great Lakes. The short-winged form, so far as known in America, is con- fined to the ocean coasts and the immediate vicinity of the Great Lakes. The vast interior region from Central America to Mani- toba abounds with only the long-winged form. If Webster's theory is the correct one, we can scarcely escape the conclusion that the short-winged form originated in the re- gions where it is at present found. No short-winged specimens have ever been reported from the Gulf States outside of Florida, from Mexico or Central America, nor west of the Alleghanies,. notwithstanding, the insect is common in those regions and the short-winged form has been carefully looked for in some of them. The long-winged insects, then, appear to have been the ancestral form in America as far as history and hypothesis can give a clue. There seems to be an inherent tendency in the species to produce the short-winged form when the proper ecological conditions are provided. How the species acquired this tendency is a very difficult thing to understand and it is not the purpose of this paper to attempt an explanation of a phenomenon that appears to be older than the division of Heteroptera into the present recognized families. According to Saunders l dimorphism is exceedingly common among British Heteroptera and this caused much confusion 1 Saunders, Edward, , "The Hemiptera—Heteroptera of the British Is lands," Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore,
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