Corydalid Life Histories 



115 



40% 

 30% 



20% 

 10% 



0% 



Aug. (10) 



=-"J , 



50% 

 g 40% 

 = 30% 



f 20% - 



0% 



20% 

 10% 

 0% 



Sept. (101 



60% -i Nov. (10) 



50% - 



Ak 



Head Width (mm) 



Fig. 2. Head-width frequencies at monthly intervals of Chauliodes pectinicornis 

 larvae from Greenbottom Swamp, Cabell County, West Virginia. Number in 

 parentheses after month is sample size. 



fied materials, amphipods, and chironomids occurred sporadically 

 throughout the year in both species. Empty foreguts were found 20 per- 

 cent of the time in C. rastricornis and 30 percent in C. pectinicornis. 

 These insects apparently indiscriminately ingested whatever food source 

 was available during the season, with detritus being the only constant 

 category in their diet. 



Under laboratory conditions, Weed (1889) and Lintner (1892) fed 

 fishfly larvae the backswimmer Notonecta undulata, dipteran larvae, 

 and spiders. Davis (1903) reported the larvae as carnivores that ate 

 smaller members of their own species, larvae of Sialis, caddisflies, dipte- 

 rans, and other accessible soft-bodied insects. 



