VOL. vii.] DR. BUREAU ON THE PARTRIDGE. 157 



the first primary of the latter — the first and second 

 juvenile primaries in this species, as in the Common 

 Partridge (and we may add also the Red Grouse, Willow- 

 Grouse and Ptarmigan), are not lost at the first moult 

 but are retained until the end of the second moult, when 

 the bird is fifteen or sixteen months old. As was done 

 ill the case of the Common Partridge, we will now 

 summarize the author's results of the progress of the 

 first moult at the time when each primary is lost : — 



The Young Red-legged Partridge at Various Ages. 



JVhen newly hatched. Down-plumage, top of head uniformly 

 reddish ; sides of head slightly tinted with red, and a brown 

 spot stretching back from tlie eye ; upper-parts and wings 

 reddish-brown tipped with blackish-brown, on the back 

 three longitudinal light-yellow bands, the median one 

 narrow, the two lateral ones broader; throat and breast 

 whitish ; rest of under-j)arts light yellow ; bill pink, shading 

 to brown above ; legs pink. Differs from the downy Common 

 Partridge in that the latter has small dark chestnut spots 

 on the top and sides of the head which become larger and 

 more diffuse on the upper surface of the body. 



At the 29th day the tenth primary is lost, the first has 

 not appeared and the second has only just begun to gro^\-. 

 The bird wears a mixture of three i)lumages. The head 

 and neck are still downy, the tail, wings (except the tenth 

 primary) and the body-feathers belong to the sprouting 

 juvenile-plumage, and the new tenth primary, just sprouting, 

 belongs to the first winter-plumage. Bill blackish-brown : 

 eye-lids red; feet and claws pale pink; weight 100 to 110 

 grams. It is capable of a flight of at least 100-150 metres. 



On the 34:th day the ninth primary is lost, and the new 

 tenth measures about 22.7 mm. The second has grown to a 

 length of 20-30 mm., and the first has just begun to appear. 

 None of the secondaries have been shed. The body-feathers 

 are entirely those of the juvenile-plumage, and a few of tliose 

 at the top of the head still have the down adhering to them. 

 Bill reddish-brown ; eyelids and feet red ; lengtli 235 mm. ; 

 expanse 390 mm. ; tail projects beyond wings 32 mm. ; 

 weight 140 grams. 



On the 4:1st day. the eighth primary is shed, the new ninth 

 being 38.2 mm. long, the second 53 mm., and the first 29 mm. 

 The third secondary is also lost about this time. The body 



