. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 197 them have failed. The larvae are about 15 mm. long, the head and pronotum are yel- lowish brown with brown spots, and the gills at the base of the abdomen are short and very bushy, each forming a compact fan with 10 to 12 filaments, fig. 616. These agree perfectly with the description of the European species of this genus, the peculiar gills being diagnostic. The case is usually slightly curved and made of wood frag- ments. We have taken these larvae in temporary ponds and in small streams, most of wh
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 197 them have failed. The larvae are about 15 mm. long, the head and pronotum are yel- lowish brown with brown spots, and the gills at the base of the abdomen are short and very bushy, each forming a compact fan with 10 to 12 filaments, fig. 616. These agree perfectly with the description of the European species of this genus, the peculiar gills being diagnostic. The case is usually slightly curved and made of wood frag- ments. We have taken these larvae in temporary ponds and in small streams, most of which became dry in summer. In each collection we made, the larvae were full grown late in April or early in May. They appear to aestivate under roots and other objects close to or under the bank of the stream or pond. We never were able to locate the larvae after the stream or pond dried up, and the cultures which we had in cages in various streams were all killed by a fungus growth. Our adult records are all late in the season, ranging from September into October, al- though in other states adult records are earlier. It is very likely that this genus has essentially the same habits as Neophylax (see p. 202). As it is impossible to be sure of the asso- ciation of any of the larvae with definite species, the records of the larvae for the entire genus are grouped together as fol- lows. Illinois Records of Cabortus Larvae: Des Plaines, Fox River: May 26, 1936, H. H. Ross, 1 larva. Fox Ridge State Park: April 12, 1941, B. D. Burks, 1 larva. Hurd, small stream: April 15, 1936, Ross & Mohr, many larvae. Oakwood: April 10, 1936, Ross & Mohr, 1 larva; May 6, 1936, Ross & Mohr, 2 larvae; May 7, 1936, Ross & Mohr, 1 larva. Rantoul, tempo- rary pond: April 10, 1936, Ross & Mohr, 1 larva. Red Bud: March 23, 1939, Ross & Burks, 2 larvae. Seymour: March 20, 1929, H. H. Ross, 1 larva. Watson: April 15, 1936, Ross & Mohr, 2 larvae; April 16, 1936, Ross & Mohr, 1
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