. Bulletin. Natural history; Natural history. 160 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 gus very long, neck long and narrow, spiral long, apex with a pair of appressed sclero- tized hooks. Female genitalia, fig. 555: eighth sternite without central ornamenta- tion; bursa copulatrix with an elongate, tenpin-like process. Our only Illinois record of this species is a large collection of males, females and pupae from Lusk Creek near Eddyville, June 19-20, 1940, Mohr & Riegel. These were taken in company with okopa and riegeli. Lusk Creek is a clear, rapid stream in the Ozar
. Bulletin. Natural history; Natural history. 160 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 gus very long, neck long and narrow, spiral long, apex with a pair of appressed sclero- tized hooks. Female genitalia, fig. 555: eighth sternite without central ornamenta- tion; bursa copulatrix with an elongate, tenpin-like process. Our only Illinois record of this species is a large collection of males, females and pupae from Lusk Creek near Eddyville, June 19-20, 1940, Mohr & Riegel. These were taken in company with okopa and riegeli. Lusk Creek is a clear, rapid stream in the Ozark Hills of southern Illinois. The only available records are from Illi- nois, Kentucky and New York. Mayatrichia Mosely May atrichia Mosely (1937, p. 182). Geno- type, by original designation: Mayatrichia ayama Mosely. This genus contains three North Ameri- can species, of which only one, ayama, has been taken in Illinois. The other two are known from Oklahoma and Texas. The three species are readily distinguished on the basis of male genitalia, but differences be- tween the females have not yet been worked out. A key to the males, followed by de- scriptions of the out-of-state species, is given on p. 278. Mayatrichia ayama Mosely Mayatrichia ayama Mosely (1937, p. 182); Larva (mature type).—Fig. 557. Length 2 mm. Head and body sclerites cream col- ored with only a few slightly darker lines around the edges of some sclerites; body white. Similar in general to Neotrichia, with cone-shaped head and slender legs. Abdomen wedge shaped, with lateral contours very even and possessing lateral fringe, similar in this respect to the Leptoceridae. Larva (free-living young form).—Fig. 557. Similar to mature type but with ab- domen small and tapering, all segments par- tially sclerotized and provided with stout setae. Anal legs close together at base, fig. 552, claws as in mature form. Case.—Fig. 558. Somewhat wedge shaped, fibrous, ventral surface flat, dorsal surface convex, raised
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