1905.] HYBRIDS AMONG NORWEGIAN BIRDS. 11 



In specimens killed in October and November, I have found 

 the stomach and crop full of leaves of various kinds of Salix, 

 and of Vaccinia (V. uliginosum, vitis-idaea and myrtillus), 

 as also tips of Calluna vulgaris. The crop is often filled en- 

 tirely with small stalks of V. myrtillus and their berries. 



In the winter, the crop and stomach are often quite full of 

 pine-needles [Pinns sylvestris), a taste inherited from the 

 mother; frequently there are quantities of juniper berries, or 

 whole handfuls of birch catkins (Betula). 



At this season of the year, indeed, the food may vary con- 

 siderably. A male, for instance, caught in Siredal, Dec. 7 th , 

 1901, contained the following articles of food 1 : 



Juniperus communis: in the crop some twigs, leaves, and 

 about 3000 (three thousand) ripe berries ; in the stomach 136 berries. 



Calluna vulgaris: a number of small twigs, all in the crop. 



Vaccinium vitis-idaea: in the crop leaves and 2 berries; 

 in the stomach a great many seeds. 



Vaccinium myrtillus: in the crop twigs, and about 200 

 berries. 



Cornus suecica: seed in the stomach. 



Empetrum nigrum: 45 seeds, all in the stomach. 



Arctostaphylos uva-ursi: 116 seeds (in the stomach), 



2. Tetrastes bonasia, (Lin.) X Lyrurus tetrix, (Lin.) 

 (mas?) (fem.?) 



Occurrence. Two male specimens of the "Hjerpe-Orre" have 

 been found in this country (Norway, 1876; Rånen, Jan. 1903). 



Diagn. Tail-feathers 18; feathers of the er omn rather long ; tar sus 

 almost entirely clothed with feathers; tail long, a little forked, the outer- 

 most feathers (in the male) curving very slightly outwards. The under 

 tail-coverts considerably shorter than the middle tail-feathers. Sise of 

 male a little less than that of a grey-hen (L. tetrix, fem.). 



1 The determination of the various seeds in this bird was made by Dr. 

 J. Holmboe. 



