Ornithology of Sardinia. 237 



43. Cypselus apus. 



This and the preceding species arrive about the same time, 

 viz. the end of the first week in April. During that month 

 I constantly met small flocks flying rapidly and steadily in a 

 northerly direction, over the large plain, extremely low, and 

 taking advantage of every small dip and hollow to shelter 

 themselves from the strong northerly wind which was blowing 

 during the month. 



44. Chelidon urbica. 



First seen on the 27th of March. Very common and breed- 

 ing in the island. 



45. HlRUNDO RUSTICA. 



Arrives in small numbers about the end of February or 

 early in March, from which time they keep gradually increas- 

 ing in numbers. Young birds were hatched about the 9th 

 of May. 



46. COTYLE RUPESTRIS. 



Common and resident, breeding in the rocks and cliffs. 



47. COTYLE RIPARIA. 



Arrives early in March, and is common. 



48. MUSCICAPA GRISOLA. 



Common in summer, arriving in the middle of April. 



49. MUSCICAPA ATRICAPILLA. 



I procured a female of this species, the only specimen I ever 

 saw, on the 24th of April. 



50. MUSCICAPA COLLARIS. 



Not common. 



51. Lanius excubitor. 



Rare. There are two specimens in the Cagliari museum. 



52. Lanius minor. 



Dr. Salvadori mentions this bird as being very common. 

 It certainly is not so about the south, where I never met with 

 a single specimen. 



53. Lanius auriculatus. 



Most abundant. Began to appear on the 7th of April; 



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