PERCENT AGE FREQUENCY Of OCCURRENCE 
86 
Psyche 
[March 
20 . 0 - 
10.0 — 
§ 
0 . 0 “ 
20 . 0 - 
10.0 — 
0 . 0 - 
1973 
LABORATORY 
HATCHED 
1972 
□ 
1 
SUMMER-1971 
(47) 
SPRING-1973 
(25) 
Figure 2. Seasonal variation of the head width in N. fasciatus larvae 
in Hisey Fork, Cabell Co., W. Va. Vertical lines = ranges, horizontal 
lines = means. 
