. Bulletin. Natural history; Natural history. 32 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 short antennae, very simple and similar front and hind wings and five-segmented maxillary palpi in both sexes. Rhyacophila Pictet Rhvacophila Pictet (1834, p. 181). Geno- type, here designated: Pictet. In Illinois we have taken five species of this genus. Four of them occur in streams which are temporary but which are rapid and clear when running; the fifth occurs m a set of small, clear, ^P""^-/^^,^'^^"^!'.^ at Elgin. Over 70 species of Rhyacophila inhab
. Bulletin. Natural history; Natural history. 32 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 short antennae, very simple and similar front and hind wings and five-segmented maxillary palpi in both sexes. Rhyacophila Pictet Rhvacophila Pictet (1834, p. 181). Geno- type, here designated: Pictet. In Illinois we have taken five species of this genus. Four of them occur in streams which are temporary but which are rapid and clear when running; the fifth occurs m a set of small, clear, ^P""^-/^^,^'^^"^!'.^ at Elgin. Over 70 species of Rhyacophila inhabit North America, most of them re- stricted to the rapid, clear streams of mountainous terrain or northern country. Westwood (1840, p. 51) hsts vuhata Pictet as the genotype. This is undoubtedly an emendation of vulgaris Pictet, since Pic- tet did not list a species by the name of vuhata in his description of Rhyacophila. KEY TO SPECIES Larvae 1 Second segment of anal larvapods with a long, bladelike, dorso-lateral spur, f^ m fuscula, p. ^b Second segment of larvapods without a ^ distinct spur, fig. 112 2. Second segment of maxillary palpus much longer than first, fig. 115. .. Second segment of maxillary palpus not longer than first, fig. 114 glaberrima, p. 3 Front and middle legs almost the same size and shape, fig. 116; baso-ventral sclerotized rod of anal prolegs pro- duced into a short, sharp, curved hook, fig. 91 lobifera,p Front femora much stouter than mid- dle femora, giving the two legs dif- ferent shapes, fig. 117; baso-ventral sclerotized rod of anal prolegs not hooked, fig. 112 "^ 4. Head wide and short, fig. 118; anal hooks without teeth on inner mar- gin, fig. 113 â ledra, p. 37; fenestra, p. 36 Head narrower and longer, fig. 119; anal hooks with at least one small inner tooth, fig. 112 vibox, p. 36 8 Apex of abdomen cylindrical (females) 1 \mca\ segment of clasper deeply in- cised to form a long dorsal point, fig. 120 lobifera p. 35 Apical segment of claspe
Size: 1127px × 2216px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
