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SNODGRASS AND HELLER 



the entrance is 120 millimeters. The entrance is ovate with the larger 

 end below ; the vertical diameter is 65 millimeters, the transverse 50 

 millimeters. There is no special lining to the nest. The floor is very 

 compact and hard. 



The eggs are about the size and shape of those of G. strenua but 

 differ somewhat in coloration. The ground color is pale greenish- 

 white, marked chiefly about the larger end, but not in the form of a 

 wreath with brownish, chestnut, umber and lavender. The darker 

 markings are confined to the apex where they sometimes form short 

 scrawly marks. One of the specimens lacks the darker markings of 

 the large end and is quite indistinguishable from specimens of G. 

 strenua. Three of the eggs measure 24 x 17, 23 x 18, 24 x 17. 



The song of this species is very different from any of the typical 

 Geospiza songs. It was heard only on Narboro and sounded like 

 cher-ke-ree-zee-ee-l . The song begins low and is gradually brought 

 up to a climax at the finish. 



MEASUREMENTS OF ADULT SPECIMENS OF 



Geospiza crassirostris. 



The following numbers represent pairs taken mated: 4443-4451; 

 4421-4422. 



