Percent Frequency 
402 
Psyche 
[Vol. 92 
80-r P * eco P tera 
0j 
40 Ephemeroptera 
J 1 T 
J L 
o J r 
40 -, Tr ' Copter a 
OJ cz= =j 
80-i Di P tera 
20-i C°l e °pt e r a 
oJ 
40 Det r i t u s 
a 
20-j Algae 
40 Other 
. cdZ] 
□ 
J 1 
2 t 
i r=n 
rz n 
1,1 J H l fl l J,l,l A ! c l n L 
DJFMAMJJASON 
Mont h 
Figure 4. Percentage frequency of food items in foreguts of Acroneuria caroli- 
nensis naiads each month. 
temperature (17° C) (Figure 5). Mingo (1983) reported A. caroli- 
nensis to be in flight from 12 June to 3 August in Maine. Flight 
periods for other Acroneuria spp. recorded by Mingo (1983) were: 
A. abnormis, 10 June to 14 July; A. arenosa, 30 June to 3 August; 
A. lycorias, 10 July. Kondratieff and Despins (1983) reported the 
