| OCR Text |
Show 84 29(28) hind Developing • • • •• ••• •• Ii wing pads ••••••• (I. (1 absent ••••••. Cloeon, ••••••••••••• Developing hind wing pads present although often minute as in Fig. 39 30(29) p. ••.•.••••. 13;7 30 Double portion of abdominal gills a recurved flap on dorsal surface; pinnate tracheal branches of gills primarily on mesal side (Fig. 45); maxillary palpi three-segmented Centroptilum, ••• in part, p. 131 p. 122 p. 139 Double portion of abdominal gills a recurved flap on ventral surface; pinnate tracheal branches of gills approximately evenly distributed (Figs. 30, 44); maxillary palpi two-segmented Callibaetis, ••••• 31(28) , Tarsal •••••••••••••••••••••• claws (Fig. 47) Tarsal distinctly spatulate Dactylobaetis, .•... claws , ••....•...• not spatulate, -- sharply pointed 32(31) , being ..•••••••••••••••••••••••••••• Two caudal filaments present, median terminal filament absent or represented by rudiment no longer than abdominal segment 10 .•.••.••••••••••••••••••••••••••.•• 33 Three caudal filaments present, median terminal filament may be shorter and weaker than cerci but is much longer than abdominal segment 10 ••••••.••••• 34 •••..•• 33(32) , Developing hind wing pads present although small and minute as in Fig. 39 Baetis, in part, ••.••••••.•••.••••..•. Developing hind wing pads •• 34(31) 32 •• •• •• • • ••• •. • • • • • • • •• • absent ••• •••••.•••••••••• filament equal to , 108 •••••• Pseudocloeon, Median terminal filament shorter and weaker than lateral cerci; distal segment of labial palpi cylindrical Baetis, in apically :r;1ed ian terminal p or part, p. 141 p. 108 |
