August, 1944 



Ross : Caddis Flies of Illinois 



185 



Fig. 645. — Leptophylax gracilis, genitalia. 

 A, male; B, aedeagus; C, female. 



1909, 1 9 ; Tuly 10, 1909, 3 2 ; July 3, 1910, 

 4<? , 19; July 7, 1910, 1 $ ; July 28, 1910, 

 1 ? ; all W. A. Nason. Chicago: June 23, 

 1907, Lincoln Park, \$ ; June 11, W. J. 

 Gerhard, 1 9, fm ; June 17, W. J. Gerhard, 



Grammotaulius Kolenati 



Grammotaulius Kolenati (1848, p. 38). Geno- 

 type, by subsequent designation of Milne 

 (1935, p. 50): Phryganea interTogationis Zetter- 

 stedt. 



No representatives of this genus have been 

 taken in Illinois. The species are all large 

 and Arctic or Subarctic in distribution. The 

 genotype is known as far south as Minne- 

 sota. The genus was revised by Denning 

 (194U). 



Limnephilus Leach 



Limnephilus Leach (1815, p. 136). Geno- 

 type, monobasic: Phryganea rhombica Lin- 

 naeus. 



Anabolina Banks (1903^, p. 244). Geno- 

 type, by original designation: Anabolina di- 

 versa Banks. 



Apolopsyche Banks (1916, p. 121). Geno- 

 type, by original designation: Stenophylax 

 minusculus Banks. 



Algonquina Banks (1916, p. 121). Geno- 

 type, by original designation: Stenophylax? 

 parvula Banks. 



Rheophylax Sibley (1926^, p. 107). Geno- 

 type, by original designation: Limnephilus 

 submonilifer Walker. 



The species treated under this genus in- 

 clude those placed by previous writers not 

 only in Limneplxilus but in AnaboUa, Ana- 

 bolina, Arctoecia and Colpotaiilius. I have 

 been unable to find characters which will 

 key out either the males or the females to 

 these groups ; available characters inter- 

 grade to such an extent that they cannot 

 be used for accurate separation. I have not 

 listed certain of these genera as synonyms 

 because the genotypes involve European spe- 

 cies which cannot be placed quite definitely 

 in relation to the North American forms. 



The characteristics of the genus are 

 varied, and the only diagnostic characters 

 which I have found are included in the key. 

 This is probably one of the largest genera in 

 North America, containing 60 or 70 species. 

 Of these we have taken only 9 in Illinois, 

 one of which is very common and wide- 

 spread, the others locally distributed and 

 rare. 



KEY TO SPECIES 

 Larvae 



1. Head yellow, with scattered brown 



dots, without dark areas or lines, 



fig. 646 consocius, p. 190 



Head with dark areas at least as ex- 

 tensive as in fig. 647 2 



2. First abdominal tergite with only a 



few setae beside dorsal hump and 

 above lateral swellings, fig. 650. . . . 



submonilifer, p. 192 



First abdominal tergite with many 

 setae in each ot these areas, fig. 651 3 



3. Mesal and lateral dark areas of head 



separated by a wide pale area, fig. 



648 rhombicus, p. 190 



Mesal and lateral dark areas of head 

 separated by a narrow pale area, fig. 

 649 indivisus, p. 191 



Adults 



1. Antennae 3-segmented (males) 2 



Antennae 5-segmented (females) 11 



2. Front basitarsus only half length of 



second tarsal segment and with a 



black, curved apical spur 



submonilifer, p. 192 



Front basitarsus longer than second 

 tarsal segment and with a straight, 

 yellow apical spur 3 



