292 Capt. Sperling^s Or-nit ho logical Notes 



miles from the land ; they were plentiful at Zanzibar and Mo- 

 ^ambic. 



22. Ardea cinerea, Linn. ") 



23. Ardea garzetta, Linn. I All these occur at Mo- 



24. NuMENius ARQUATUS (Linn.). (^ yarabic and Zanzibar, 



25. ToTANUs GLOTTIS (Linn.). 



26. Tringa schinzi, Brehm. 



27. Tringa subarquata (Gmel.) 



> 



and probably on the 

 intermediate coast. 



28. Phcenicopterus erythr^us, Verr. 

 Plentiful, in large flocks, on the Mojambic flats. 



29. Plectropterus gambensis (Linn.)*. 



Mr. Young, who conducted the expedition up the Zambesi 

 in search of Dr. Livingstone, presented me with a living speci- 

 men of this bird, which he had brought from the Shire river. 



Mr. Layard, to whom I sent it to look at, writes to me 

 saying, " P. gambensis, I think ; but it differs much from my 

 specimens, being very much blacker, and having far fewer white 

 markings on it." I intend, if possible, to forward this bird to 

 England alive. 



30. Thalassidroma melanogaster, Gould. 



This species joined us directly we were outside False Bay, 

 and remained with us till about lat. 27° S. I never noticed 

 them to settle on the water, nor with the closest observation 

 did I ever see how they fed; they would hover over refuse 

 thrown from the ship, but did not appear to touch the water, 

 or patter along its surface like T. pelagica. That they do feed 

 on spawn I have previously noticed. Although they were in 

 hundreds I never noticed a T. leucogaster, and I should not 

 wonder if it did not eventually turn out that it is only an 

 accidental vai'iety of this species. 



Mr. Layard, however, informs me that he has both species in 

 the South-African Museum. 



* [Qu. r. rueppelU, Sclater, P. Z. S. 1869, p. 131, pi. cliii., and 1860, 

 pp. 38-42 ?— Ed.] 



