LABIDJS. 363 



this Tern ; it was circling for some time round a vley 

 in company with another; these and another seen on 

 the Great Flat a few days since are the only individuals 

 I have yet met with. 



March 6th. — Axel obtained one to-day ; and since the 

 above date I have twice observed it. 



Measurements of a female : — 



in. lin. 



Entire length 10 10 



Length of folded wing .... 9 



„ tarsus 11 



„ middle toe . . . . 10 



„ tail 3 6 



„ bill 17 



[The Norwich Museum possesses a female specimen of this 

 Tern in fall breeding-dress, obtained by Mr. Andersson in 

 Ondonga on the 6th April. — Ed.] 



420. Hydrochelidon nigra (Linn.). White-winged Black Tern. 



Sterna leucnptera, Gould's Birds of Europe, pi. 423. 



„ „ Naumann's Nat. Vogel Deutsch. pi. 257. 



„ „ Ayres, in Ihis, 1871, p. 267. 



Hydrochelidon nigra, Gray's Hand-list of Birds, No. 11070. 



I have never seen this Tern on the sea-shore, but 

 it is common on many inland freshwater lakes, and 

 during the wet season hunts over the temporary rain- 

 pools. 



It feeds on fry, frogs' spawn, snails, &c. 



It flies slowly and heavily, examining the ground 

 carefully as it progresses. 



Colour. — Forehead, cere, chin and throat, and a space 

 on each side of the nape, lower part of the neck, all the 

 underpart, including axillary plume and under wing- 



