August, 1944 



Ross: Caddis Flies of Illinois 



215 



CANDIDA 



75IC 



DIARINA 



SPILOMA 



Figs. 749-753. — Leptocella, male genitalia. A, lateral aspect; B, claspers; C, styles at 

 base of claspers. 



species which have not yet been investigated 

 sufficiently to determine their status. Such 

 forms as coloradensis, iii/ervena and minuta 

 have not been satisfactorily diagnosed. I 

 have been unable to find any appreciable 

 difference in the male genitalia of these. 

 Experience with the Illinois fauna leads me 

 to believe that until cultures of these other 

 species are reared, or until additional adult 

 characters are found, it will be unwise to 

 attempt definite placement of these names. 

 There is a very good possibility that many 

 of them represent distinct species. Not until 

 we know how many species exist and what 

 are their limits can we satisfactorily diag- 

 nose them. 



KEY TO SPECIES 



Larvae 



1. Hind legs with only scattered hair. 

 Head yellow with a definite V mark, 



as in fig. 744 albida, p. 220 



Hind legs with a definite swimming 

 brush of long hair, fig. 716. Head 

 with either large, irregular brown 



areas or with parallel dark lines, figs. 

 745-748 2 



2. Head with parallel dark lines which 



are carried back on the pronotum, 



fig. 745 diarina, p. 218 



Head with irregular dark areas or a 

 dark network, fig. 746 3 



3. Middle and hind legs almost entirely 



black beyond coxae; dorsum of head 

 with fine reticulations, fig. 746. . . . 



Pexquisita, p. 217 



Middle and hind legs mostly yellow, 

 at most with small dark areas; dor- 

 sum of head with solid lines or areas 

 of brown or black, figs. 747, 748. . . 4 



4. Legs pale, banded with dark brown or 



black sp. a, p. 221 



Legs almost uniformly light colored. . 5 



5. Head with an open network of dark 



brown or black lines, fig. 747 



pavida, p. 218 



Head with more extensive dark areas 

 as in fig. 748 Candida, p. 217 



Adults 



1. Genitalia with claspers and aedeagus, 



fig. 749 (males) 2 



