| OCR Text |
Show 24(22) Abdominal --- gills with margins fringed (Fig. 131); labrum fully as broad as head Traverella, p. 226 part, p. 209 Siphlonurus, p. 100 •••••••••••••••• Abdominal gills forked with the margins entire (Figs. 128-129); labrum much narrower than head ••••••••••••••.••••• 25(14) Gill Gill ---. abdominal on •••••••••••••••• lame llae segments 26(25) double lamellae segments 1-2 s in Paraleptophlebia, ••••••••••••••• LngLe all on abdominal •••••••••••••••••••••••••••••.••• ,... 26 Abdominal gills obovate with sclerotized band along ventral margin and usually similar band near or on dorsal margin (Fig. 10); distal segment of labial palpi elongate; on pectinate spines present (Fig. 9) maxillae of crown ....•.... Ame Le t.us •••••••••••••••••••••••••••••••• , p , 87 Abdominal gills semi-cordate, without sclerotized bands as above (Fig. 3); distal segment of labial palpi pincer 21); pectinate spines shaped (Fig. absent • 27(24) • •• •• from •• • • • of crown • • • • • • • • • maxillae • • • • • • • •• •••••••••• Parameletus, Postero-lateral projections well developed on abdominal segment 8, small on segment 9 (Fig. 48) Genus •••••••••••••••••••••••••• not p. 98 p. 143 . incertus, well Postero-lateral projections developed oti abdominal segments 8-9 although sometimes weakly produced (Fig. 30) 28(27) Abdominal or single ••.••••••••••••••••••••••••••••••••• 28 with lamellae double, lamellae with recurved flap of gills or ventral surface gills on dorsal on segments 1-6 (Figs. 30, 44-46) •••••••••••• 29 Abdominal gills of flat, simple lamellae, never double nor with recurved flap on gills on segments 1-6 .•••••••••••••••••••.••• 31 |
