. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 121 Male genitalia, fig. 916, (see p. 272) : eighth sternite bilobed, forming a pair of widely spaced triangles; ninth tergite with a brush of long setae; claspers fused to form a short, broad spatula; aedeagus as in fig. 916. Fe- male genitalia with segments simple; bursa copulatrix as in fig. 921 (see p. 273). The larva was described by Lloyd (1915fl) under the name Itliytricliia confusa (misidentification). Our only Illinois records of this species are from the Apple River in Apple River Canyon State P
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 121 Male genitalia, fig. 916, (see p. 272) : eighth sternite bilobed, forming a pair of widely spaced triangles; ninth tergite with a brush of long setae; claspers fused to form a short, broad spatula; aedeagus as in fig. 916. Fe- male genitalia with segments simple; bursa copulatrix as in fig. 921 (see p. 273). The larva was described by Lloyd (1915fl) under the name Itliytricliia confusa (misidentification). Our only Illinois records of this species are from the Apple River in Apple River Canyon State Park, situated in the Jo Daviess hills of extreme northwestern Illi- nois. In one or two of the swiftest rapids of the river we have taken larvae and pupae on large stones in the center of the current. In the northern states, the species' range is practically transcontinental, with definite records from Colorado, Idaho, Michigan, Minnesota, New York, Oregon, Wisconsin and Wyoming. Illinois Records.—Apple River Can- yon State Park: Aug. 23, 1939, Ross & Riegel. 1$, 2$; Apple River, May 24, 1940, H. H. Ross, \ $ , 2 larvae, many pu- pae; June 6, 1940, Mohr & Burks, 2$ ; April 9, 1941, Ross & Mohr, many Metrichia Ross Metrichia Ross (1938<r, p. 9). Genotype, by original designation: Orthotrichia nigritta Banks. The genotype is the sole species in the genus and is known from Texas and Okla-. 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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