. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 63. MACULATUS /' PENTUS ^ CINEREUS Figs. 249-261.—Polycentropus, female genitalia, ventral aspect. shorter, without expanded apex and with toot not angulate, fig. 252. . glacialis, p. 68 21. Bursa copulatrix with a wide base and long, vasiform, sclerotized apical structures; internal structure of ninth segment as in fig. 253, with rounded, nearly approximate apical lobes which are sclerotized only at apex centralis, p. 64 Bursa copulatrix shaped differently, figs. 254-259; internal structure with longer l
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 63. MACULATUS /' PENTUS ^ CINEREUS Figs. 249-261.—Polycentropus, female genitalia, ventral aspect. shorter, without expanded apex and with toot not angulate, fig. 252. . glacialis, p. 68 21. Bursa copulatrix with a wide base and long, vasiform, sclerotized apical structures; internal structure of ninth segment as in fig. 253, with rounded, nearly approximate apical lobes which are sclerotized only at apex centralis, p. 64 Bursa copulatrix shaped differently, figs. 254-259; internal structure with longer lobes which are farther apart 22 22. Ninth sternite with ovoid sclerotized lobes on each side of bursa; eighth sternite nearly triangular with the sides slightly sinuate, fig. 254 species a, p. 66 Ninth sternite without ovoid lobes as in fig. 254; eighth sternite with apex more rounded, often nearly truncate, figs. 255-259 23 23. Ninth sternite without sclerotized bands; bursa supports sometimes heavily sclerotized, figs. Ninth sternite with sclerotized bands in addition to supports of bursa copulatrix, figs. 258, 259 26 24. Upper portion of bursa supports thick, wide and twisted, fig. 255, and lower portion forming a thick bridge below bursa pixi, p. 66 Bursa supports much more slender, 24. 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
Size: 1531px × 1631px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
