176 Mr. J. Cordeaux on the Heligoland 



from midday to evening in batches of from five to fifteen or 

 twenty to fifty, one following the other so closely that the 

 first batch is not out of sight before the third or even the 

 fourth begins to show already. The vernal migration takes 

 place about the latter part of May, or a little earlier, on warm 

 days with a calm clear sky and easterly wind. 



Circus cineraceus (Montagu). 



Circus swainsoni. Smith. 



In the collection, three immature birds. 



Nyctala tengmalmi (J. F. Gmelin) . 

 Recent occurrences are Oct. 15th, 1859, two caught ; Nov. 

 1866, one. 



Asio ACciPiTRiNus (Pallas) . 

 Common in the autumn migration. 



Scops giu (Scopoli). 

 May 16th, 1863. 



Lanius excubitor, Linneeus. 



Several in Mr. Gatke's collection. I saw other examples 

 also in the shops of the bird-stuffers. Appears to be a com- 

 mon migrant, arriving early in spring and late in the autumn. 



Lanius minor, J. F. Gmelin. 



Not so common as L. excubitor, occurring in the propor- 

 tion of one to two of the former, is a much shier bird, and 

 very diflScult to get near. 



Lanius collurio^ Linnaeus. 

 In the collection. 



Lanius auriculatus, P. L. S. Miiller. 

 The same. 



Lanius phoenicurus, Pallas. 



One example in the collection. Oct. 26th, 1854*. 



MusciCAPA coLLARis, Bechstcin. 



June 3rd, 1860, a male, the only example hitherto obtained. 



* With regard to tliis species Mr. Gatke has recently informed me by 

 letter, " it has turned out my little red-tailed Butcherbird is not L. ph(e- 

 nicurus, Pallas, but some other smaller species. 



