42 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I46 



think of its use of other hosts almost as relatively unusual. This 

 concept is, as we now know, erroneous. As a matter of fact, the 

 parasitism of this species on the magpie is remarkable in two very 



1 1 



2 ''1 3 1 



5 1 

 1 1 1 1, 



373 2 '1, 



1 2 8 18 2 5 J 



012345678 



Number o( Corvui csjt per nesi 



Fig. 9. — Distribution of Clamator glandarius eggs in nests of Corviis, and the 

 number of instances of each particular combination of egg numbers. 



dissimilar ways. For one thing, the adaptive resemblance in tgg 

 coloration between them is so close as to imply a lengthy evolutionary 

 relationship between the two birds. On the other hand, at least in 

 terms of their respective present distribution, the two are sympatric 

 only in a very small, peripheral portion of the range of each. 



