August, 1944 



Ross: Caddis Flies of Illinois 



181 



black streak, fig. 638 



Grammotaulius, p. 185 



Hind wings with Rs not bordered with 

 a dark streak 18 



18. Front wings with first cell l^J much 



more than half as long as second 



cell \J, fig. 634 19 



Front wings with first cell lA at most 

 only half as long as second cell L^, 

 fig. 636 20 



19. Front wings with post-apical margin 



rounded, fig. 634, and last tarsal seg- 

 ment ol all legs without black 



spines Drusinus, p. 202 



Front wings with post-apical margin 

 oblique, fig. 635, and last tarsal seg- 

 ment of 1 or more legs with 1 or 

 more short, black ventral spines. . . 

 Pycnopsyche, p. 193 



20. Mesonotum with mesoscutal warts 



represented by a poorly defined, 

 linear area ot setae, some of them 

 stout, fig. 639; head either with 1 

 or 2 pairs ot long, stout macrochae- 

 tae in postocellar area or with only 

 a tew, stout setae on posterior 

 warts, fig. 639. . . . Limnephilus, p. 185 

 Mesonotum with mesoscutal warts 

 ovate, well delimited and with long, 

 silky hair, fig. 640; head with scat- 

 tered hair over postocellar area and 

 with long, silky hair on posterior 

 warts, fig. 640 21 



21. Last tarsal segments without black 



ventral spines; male claspers dis- 

 tinctly 2-segmented; female genitalia 

 of eastern species with tenth seg- 

 ment vasiform. . . . Dicosmoecus, p. 181 

 Last tarsal segment ot at least 1 or 2 

 legs with 1 or more short, black ven- 

 tral spines; male claspers with only 

 1 segment, figs. 673-678; temale 

 genitalia with apical portion not 



vasiform, fig. 680 



Pycnopsyche, p. 193 



Fig. 639. — Limnephilus sitbmoyiilijer, head 

 and thorax. 



Fig. 640. — Pycnopsyche subfasciata, head 

 and thorax. 



Radema Hagen 



Radema Hagen (1864, p. 799). Genotype, 

 monobasic: Radema injernale Hagen. 



Apatidea McLachlan (1874, p. 33). Geno- 

 type, here designated: Apatidea copiosa Mc- 

 Lachlan. 



Apatelia Wallengren (1886, p. 78). Geno- 

 type, here designated: Apatania [Apatelia) 

 inornata Wallengren. 



Apatania of authors, not Kolenati. 



No Illinois species of this genus have yet 

 been reported, but several are known in the 

 northeastern states. In general, the group 

 is Arctic and Subarctic, occurring as far 

 south as New York and Connecticut. 



This group was formerly called Apatania. 

 The genus Apatania, however, has as its 

 only included species one which belongs to 

 the genus Molanna; Apatania, therefore, 

 must be considered a synonym of Molanna. 



Dicosmoecus McLachlan 



Dicosmoecus McLachlan (1875, p. 122). Gen- 

 otype, here designated: Stenophylax palatus 

 McLachlan. 



No species of this genus is known to occur 

 in Illinois, but quadrinotatus occurs in the 

 Northeast. 



Platycentropus Ulmer 



Platycentropus Ulmer (1905rt, p. 13). Geno- 

 type, by original designation: Halesus maculi- 

 pennis Kolenati. 



Hylepsyche Banks (1916, p. 121). Genotype, 

 by original designation: Halesus indistinctus 

 (Walker). 



Of the three species described in the genus 

 only one is known from Illinois. 



Platycentropus radiatus (Say) 



Phryganea radiata Say (1824, p. 308). 



Limnephilus indicans Walker (1852, p. 23); 

 9. New synonymy. 



Halesus maculipennis Kolenati (1859i^, p. 

 176); d^. New synonymy. 



Hallesus hostis Hagen (1861, p. 266); cf. 

 New synonymy. 



Larva. — Length 24 mm. Head and pro- 

 notum with ground color yellowish brown, 

 nearly orange, irregularly speckled with 

 small black dots which are arranged to form 

 a small design on the frons. Mesonotum 



