. Bulletin. Natural history; Natural history. Mav. 1953 Burks: The Mayflies of Illinois 43. Fig. 88.—Xymph of Neocphemera purpurea. (From Traver. Figure used by permission of the Comstock Publishing Company, Ithaca, New York.) the Javanese Neoephemeropsis, each cercus is also clothed, on the mesal side, with a dense comb of long setae, and the median caudal filament bears such a comb of long setae on either side. There are two described species of Neoe- phemera in North America. A'^. bicolor McDunnough (1925^:168) is known from Michigan, Quebec, and Georgia; purpurea (Traver) (1931fl:103; 1937
. Bulletin. Natural history; Natural history. Mav. 1953 Burks: The Mayflies of Illinois 43. Fig. 88.—Xymph of Neocphemera purpurea. (From Traver. Figure used by permission of the Comstock Publishing Company, Ithaca, New York.) the Javanese Neoephemeropsis, each cercus is also clothed, on the mesal side, with a dense comb of long setae, and the median caudal filament bears such a comb of long setae on either side. There are two described species of Neoe- phemera in North America. A'^. bicolor McDunnough (1925^:168) is known from Michigan, Quebec, and Georgia; purpurea (Traver) (1931fl:103; 1937:34) is known from Florida, Georgia, North Carolina, and South Carolina. This family corresponds to the subfamily Caeninae of the family Baetidae in Traver's classification (1935«:629), and to the family Caenidae in Ulmer's classification (1933:206). The members of the Caenidae are among the most distinct of the mayflies. In most species, the individuals are small, but some attain a body length of 6 or 7 mm. The adult females are slightly larger than the males, but otherwise they are almost iden- tical in appearance; even the compound eyes of one are not larger than those of the other. In both sexes, each lateral ocellus is at least one-half as large as one of the compound eyes. The thorax is greatly de- veloped, while the abdomen is relatively small and contracted, giving these mayflies a rather thickset appearance. The fore wing is white, being quite cloudy or milky, the costal margins tinged with grayish lavender; the marginal ciliae are numerous, even in the imago stage. In all genera, the wings char- acteristically have very few crossveins, and, except in Leptohyphes, they are quite broad in the anal region, figs. 97, 98. The hind wing is wanting except in the subimago stage of the genus Leptohyphes. Each tarsus has five segments, figs. 11-13. The abdomen is somewhat broad and flattened dorsoven- trally, with the posterolateral angles of each segment obliquely
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