51a (50b). Abdomen with a pair of hooks, usually on anal prolegs, at posterior end and without

long lateral processes (but at times with finger-like gills); tarsi with 1 claw; usually living

in cases (Figs.A-F) [caddisfly larvae]..........................................................….............…....Trichoptera

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A B C

D E F

51b. Abdomen with 4 hooks at posterior end or none, and with or without long lateral

processes; tarsi with 1-2 claws (Fig.A); not living in cases [beetle larvae].......................

........................................................................................................................…............... Coleoptera..... 152

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A