Occasional Papers of the Museum of Zoology University of Michigan

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V~\RIOUS species have been included in the 0,-clzelimunz concinnzlnz group, seven by Blatchley (1920) and two by Rehn and Hebard (1915). In this paper we discuss three species which form the core ol' the group, however it is constituted, but which have been treated ill different ways by earlier investigators-usually as subspecies or other categories within a single variable species. O?.cheli~nzlnz concinnz~nz was described by Scudder (1862) fro111 Cape Cod, Massachusetts. I n 1891, Bruner described 0. delicatunz (as gracile, a hornonym; see Bruner, 1892) froin Nebraska, from "about the margins of ponds and along the edges of streanls where it frequents rank growing grasses and sedges" (p. 71). Blatchley (1893) described 0. canzpest~e and 0. indianense from northern Indiana. Kehn and Hebard (1915) treated cantpestre, ind ia~tense , and delic n t z ~ ~ ~ z as synonyms of concinnum, though, as Blatchley pointed out in 1920, they were forced to bring co7zcinnunz out at two different poinls in their key owing to the difference in relative lengths of the ovipositor and hind femora of western (delicaturn) and eastern (conc innz~nz) sl~ecil-riens. They considered the dark red stripe down the ~lliddle of the lace ol soine specimens useless as a taxonomic character, stating that inl~nature individuals kept under observation did not develop the red stripe until after they had molted to adulthood and had become thoroughly hardened. This conclusion apparently aras based on an

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تاریخ انتشار 2007