NOVITATES ZoolOgtcAe XXU. 191o. 79 



50. Glareola pratincola pratincola (L.). 



A few were observed aud shot on the lake not far from Aia-Oussera oa 

 May 11 and 12. They had evidently no eggs, and there was no sign of their 

 nesting there. 



51. Columba livia livia Gm. 



Wild Eock-doves are found on the rocks near the Hassi-Rebib, and several 

 were shot flying overhead or sitting in sheltered places on the cliiTs in a gale. 



52. Sterna nilotica Gm. 



A flock of these tine Terns frequented a small shallow lake on the Hants 

 Plateaux near Ain-Oassera about the middle of May. They were sometimes very 

 noisy. 



53. Hydrochelidon nigra (L.) 



and 



54. Hydrochelidon leucoptera (Temm.). 



Single specimens of each of these two Terns were seen on the lake near 

 Ain-Oussera, middle of May. 



55. Caccabis petrosa petrosa (Gm.) 



and 



56. Caccabis petrosa spatzi Rchw. 



We collected a nnmber of eggs of both forms ; of C. p. petrosa near Hammam 

 Meskoutine (very hard set on May 22) and of C. p. spatzi near El-Outaya, Biskra, 

 and in the Oned-N(;a, March 25, April 1 and 20. The eggs of the two subspecies 

 are indistinguishable. 



