NO. 3665 CADDISFLIES—FLINT 9) 
on 
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Key to Families 
LARVAE 
Pro-, meso-, and metanotum covered by sclerotized plates . ...... 2 
Meso- and metanotum either membranous or only partially covered. . . 3 
Abdomen with many branched gills. ...... .. . HYDROPSYCHIDAE 
Abdomen without Gilley enevon ee . . HYDROPTILIDAE 
Anal proleg pro] ecting ventrad at eh poles te ae ‘ne axis; inhabiting a 
case made of sand grains in the shape of a turtle’s shell . GLOSSOSOMATIDAE 
Anal proleg extending in axis of body, or fused to last segment; either free- 
living, or in a differently shaped case .. . Rhian 0. tee: 
Anal proleg extending freely from the nodomon: uke ree. aie or in a 
fixed silken retreat ..... Ath ort ty See 
Anal proleg fused to apex of pidomens clear ae tice. in a Meds movable 
House) \.».. ee bin oltre geet ot 10 
Ninth Redomtnal Conan =ifia a cleric: free fying jes Reece in 
Ninth segment membranous dorsally; in a fixed retreat ........ 6 
Labrum membranous, with anterior margin expanded laterally (T-shaped). 
PHILOPOTAMIDAE 
Labrum sclerotized, roughly semicircular ...... . . PSYCHOMYIIDAE 
Labrum with a transverse row of about 20 setae dorsally; in a flat case of 
leaf fragments. .... Se ae 2 TCALAMOCHRATID ATE 
Labrum with about 6 erect seine dorsally, 3 pea HuohKed en 6) 8 
Anal claw with a series of teeth, comblike; case coiled flee a nel shell . 
HELICOPSYCHIDAE 
Anal claw with a single tooth; case tubular. . .. . 56 oo 5 
Antenna about 8 times as long as broad, arising near nee a Pencils : 
LEPTOCERIDAE 
Antenna practically invisible, barely longer than broad . . ODONTOCERIDAE 
PUPAE 
Apex of abdomen with projecting, finger-like processes. . ....... 5 
Apex of abdomen without long processes, with only the lobes containing 
developing genitalia. . . . SE es TEAS fn; SIR PORE 2 
Mandibles with inner margin Saue 6a 06 6 56 0 6 6 Jalyannoprn aya 
Mandibles with teeth or large serrations on inner margin. ....... 3 
Mandibles with serrations along inner margin. . . . . . RHYACOPHILIDAE 
Mandible with 1 or 2 large teeth in addition to serrations ....... 4 
Mandible with a single large tooth on inner margin . . GLOSSOSOMATIDAE 
Mandible with 2 teeth on inner margin .. . . . . . PHILOPOTAMIDAE 
Third and/or fourth abdominal segments yesuee hook-plates posteriorly . 
HYDROPSYCHIDAE 
Only the fifth segment bearing a hook-plate posteriorly ........ 6 
Seventh segment without hook-plates anteriorly. . ......2.2..2.7 
Seventh segment with hook-plates anteriorly ............. 8 
Apical processes tipped with hairs as long as processes . HELICOPSYCHIDAE 
Apical processes either without hairs or they are much shorter than proc- 
esses... . Hens ees Os BPTOCHRIDAE 
Lateral line of Bains Moines on Habdonion Pe ni tons SES YCHOMYILD AY 
Lateral line of setae well developed ..... POMEL oh koe CLG hte 
Dorsum of abdomen with transverse brushes of uctnes . CALAMOCERATIDAE 
Dorsum of abdomen without heavy brushes of setae . . . ODONTOCERIDAE 
