18 Lieut.-Col. J. W. Yerbury — Further Notes 



When I first arrived at Laliej, early in March 1895^ a con- 

 siderable number of Swifts were to be seen daily, and from 

 their size I should say they were undoubtedly of this species ; 

 they all disappeared before the end of the month. At Shaik 

 Othman, on the 3rd and 4th of April, a flock of Swifts was 

 flying about over the village. I watched these birds for some 

 time, but could not detect any white on their underparts, 

 and I know that I have a similar note in my diary of 1885 

 regarding a flock seen at the tanks in Aden, but I cannot 

 now verify the date ; it is possible, therefore, that C. apus also 

 occasionally visits the neighbourhood of Aden. 



21. Cypselus affinis, Hardw. 



Micropus affinis, Hartert, Cat. B. Brit. Mus. xvi. p. 453 

 (1892). 



I met with examples of this species on two occasions 

 hawking about over the bed of the Wady Sugher. The first 

 was near Lahej on the 12th of March. On this occasion I 

 fired three reduced charges {vide Hume, ' Indian Ornitho- 

 logical Collector's Vade Mecum') without result, and the 

 flock declined to wait for further attentions. The second 

 occasion was near Haithalhim on the 23rd of March, when I 

 had only a butterfly -net with me. 



22. Caprimulgus NUBicus, Licht. j Hartert, Cat. B. xvi. 

 p. 560. 



Caprimulgus, sp. inc., Yerbury, Ibis, 1886, p. 15; Barnes, 

 Ibis, 1893, p. 69. 



The Aden Nightjar is almost to a certainty of this species, 

 still the single specimen obtained by me does not quite tally 

 with either of the two specimens of C nubicus in the British 

 Museum. Capt. Nurse, 13th Bo.N.I., informs me that he 

 found a nest containing two young Nightjars in a wady at 

 Lahej in May 1894. The nest was probably one of this 

 species. 



I believe that a second species of Nightjar is to be found 

 in the neighbourhood of Lahej ; it is altogether a larger 

 bird, but as the only glimpses of it have been obtained in 



