Author： WHITCOMB ROBERT F. KRAMER JAMES P. COAN MICHAEL E.
Publisher： Entomological Society of America
ISSN： 1938-2901
Source： Annals of the Entomological Society of America, Vol.65, Iss.4, 1972-07, pp. : 797-798
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Abstract
Male genitalia and geographical distribution of Stirellus bicolor (Van Duzee) and 3 S. obtutus (Van Duzee) are similar. In Maryland, the drab S. obtutus is a general grass feeder found only from late August to early June, whereas the ornate S. bicolor feeds on Andropogon spp. and is found only from June to early October. S. obtutus collected from the field in April produced a generation of S. bicolor when confined on rye, Secale cereale L., in a growth chamber with a 16-hr photophase. Adult S. bicolor collected from the field in August produced a generation of S. obtutus when similarly confined. The S. obtutus progeny gave rise to continuous generations of S. bicolor. However, when a portion of the colony was transferred to a 13-hr photophase, S. obtutus reappeared. It is concluded from this evidence that S. bicolor and S. obtutus are photoperiodically induced color forms of a single species. (NEW SYNONYMY.)
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