BRITISH GUYANA BIRDS EGGS 145 



NOTE XXX. 



ON EGGS OF SOME BRITISH GUYANA BIRDS. 



BY 



Dr. C. G. YOUNG. 



1. Nyctidromus albicollis (Gm.) '). 

 Goat Sucker , Jumbi Bird. 



They make no nest but lay their eggs in a depression 

 in the ground where it is dry, on the beds of cultivated 

 land, on the high dams between plantations, on the bare 

 rocks up the rivers, and on the savannahs in the „Interior". 



They lay two or three eggs. 



The egg is smooth, regularly oval — 30 mm. by 22 

 mm. — , light pink with darker pink blotches. 



They hatch from March to July. — One egg (N°. 1). 



Although I kept all the eggs in the dark , the above 

 mentioned one has much faded during its being in my pos- 

 session. 



2. Progne chalybea (Gm.). 

 Swallow. 



They build a flat nest of coarse grass and fine sticks , 

 lined with a few leaves, on the beams about houses. 



1) Excepting three Herons and the two species of Tinamus, all the eggs, pre- 

 sented to our Museum by Dr. Young, have been accompanied by birds skins of 

 the species the eggs belong to, and therefore identification is rendered quite 

 easy and unmistakable. J. Büttikofer. 



Note* from the Leyden Museum , "Vol. XI. 



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