1973] 
Carmichael — A raneus 
69 
TABLE II 
A. trifolium (N=166) A, marmoreus (N=98) 
tibial 
spine 
tibial 
total 
dentiform 
length 
(mm) 
count 
length 
(mm) 
spine 
count 
spine 
count 
mean 
2.31 ± 0.06 
21.59 ± 0.31 
3.39 ± 0.09 
3 1. 54 ± 0.66 
13.01 ± 0.32 
standard 
deviation 
0.44 
2.22 
0.52 
3.66 
1.76 
mean 
difference 
(absolute) 
* 
1.25 ±0.23 
1.82 ±0.43 
r 2 
0.134 
0.127 
. — 
Self-explanatory: the means are presented with their 99% confidence 
intervals. See text for details. 
two regions might be obscured by the fact that specimens from one 
of the regions are generally smaller than those from the other (which 
itself might be due to significant geographic variation in size, or to 
differences in sampling techniques, etc.). 
Acknowledgments 
I wish to thank Dr. H. W. Levi, my advisor at the time this 
study was done, for his advice and patient help; Dr. S. J. Gould, 
who advised me on the interpretation of statistical data; and the 
late Mr. Ivie of the American Museum of Natural History, who 
loaned me specimens from that museum. While doing the research 
for this paper, I was supported until June, 1969 by a scholarship 
from the National Merit Foundation, and subsequently by an 
NDEA title IV fellowship. 
References 
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