. Bulletin. Natural history; Natural history. 78 Illinois Natural History Survey Bulletin Vol. 26, Art. 1 to almost white; j;enital forceps tan or reil- brovvn; caudal filaments lijrht yellow or tan, articulations dark brown. Nymi'H.—Length of body 8-10 mm. Frontal tubercles of bead virtually wantinti, only faintly indicated; each ^ena slightly pro- duced above base of mandible as a small, subtriangular shelf, fiji. 179; dorsal and lateral spines of mesonotal shield long and relatively slender; mesonotal shield relatively long anil slender, with a maximum width, not including lateral spines, t
. Bulletin. Natural history; Natural history. 78 Illinois Natural History Survey Bulletin Vol. 26, Art. 1 to almost white; j;enital forceps tan or reil- brovvn; caudal filaments lijrht yellow or tan, articulations dark brown. Nymi'H.—Length of body 8-10 mm. Frontal tubercles of bead virtually wantinti, only faintly indicated; each ^ena slightly pro- duced above base of mandible as a small, subtriangular shelf, fiji. 179; dorsal and lateral spines of mesonotal shield long and relatively slender; mesonotal shield relatively long anil slender, with a maximum width, not including lateral spines, two-thirds as great as maximum length. Known from Illinois, Michigan, New Brunswick, Ontario, and Quebec. Develops in cool, fairly rapid streams. Illinois Record.—Aroma Park: Kanka- kee River, June 4, 1947. H. D. Burks, 1 S . 3. liaetisca ohesa (Say) Baftis ohesa Say (1839:43). Male.—Length of fore wing 9-11 mm. Compound eyes tan, lower portion slightly darker; head and antennae yellow-brown. Mesonotum red-brown, darker at apex of scutellum; thoracic pleura yellow-brown; sternum yellow-brown, becoming lighter to- ward posterior margin. Each fore leg light yellow, apex of femur, of tibia, and of each tarsal segment darkened with yellow-brown; middle and hind legs almost white, brown shading at apex of each tarsal segment; wings hyaline, veins C, Sc, and R, of fore wing brown-shaded at bases, light yellow distad. Abdominal tergites dark brown, be- coming chestnut brown on posterior tergites; sternum light brown, slightly darker on apical three sternites; genital forceps, fig. 174, and caudal filaments usually white or very faintly stained with tan; basal articu- lations of caudal filaments sometimes brown. Nymph.—Length of body 8-10 mm. Frontal tubercles of head well developed, projecting as a pair of rounded protuber- ances; each gena produced above base of mandible as a triangular ledge, fig. 180; dorsal and lateral spines on mesonotal shield relatively short and stout;
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
