August, 1944 



Ross: Caddis Flies of Illinois 



75 



Fig. 275. — Lype diversa, male genitalia, 

 showing variations of dorsal horn of tenth 

 tergite. 



represents the latter, the type of griselda 

 a more or less intermediate condition. Ex- 

 amination of considerable material indicates 

 that this entire range is merely variation 

 within the species. Representative condi- 

 tions found, showing the two extremes and 

 intermediate steps, are illustrated in fig. 275. 



Our only Illinois record of this species 

 is a male collected along Quiver Creek at 

 Havana, May 29, 1936, Mohr & Burks. 



The range of the species is widespread 



through the eastern states, extending west- 

 ward to Wisconsin and Illinois. We have 

 records from Florida, Michigan, New 

 Hampshire, New York, North Carolina, 

 Ohio, Ontario, Tennessee, Vermont, Vir- 

 ginia and Wisconsin. 



Psychomyia Pictet 



Psychomyia Pictet (1834, p. 222). Geno- 

 type, here designated: Psychomyia annuli- 

 cornis Pictet. 



Quissa Milne (1936, p. 89). Genotype, mon- 

 obasic: Psychomyia flavida Hagen. 



Of the three described North American 

 species, only flavida has been taken in Illi- 

 nois. Of the other two species, nomada is 

 known only from the eastern states, and 

 lumina is known only from Oregon. 



The genus was described without any 

 included species. Pictet was the first to 

 place species in the genus, and since no geno- 

 type has apparently been designated, I pro- 

 pose his first included species, annulicornis, 

 in that capacity. 



Psychomyia flavida Hagen 



Psychomyia flavida Hagen (1861, p. 294); 9. 

 Psychomyia pulchella Banks (1899, p. 217); 

 9. 



Psychomyia moesta Banks (1907«, p. 131); 9. 



Larva. — Fig. 277. Length 6 mm. Head 

 and pronotum yellowish brown, other scle- 



Fig. 276. — Lype diversa, female genitalia. 



Fig. 277. — Psychomyia flavida larva, head. 



rites straw color, body green. Frons with 

 anterior margin sinuate. Legs short, claws 

 short and angled, fig. 274. 



Adults. — Length 4—6 mm. Head, body 

 and appendages straw color with a slight 

 purplish tinge on many areas. Male geni- 

 talia, fig. 278: tenth tergite divided into 

 two large, flaplike lateral lobes to which 

 are fused the cerci; claspers short, flat and 

 truncate; aedeagus with a central arcuate 



