THE LIGHT-BELLIED BRENT 



В RANT A BERNICLA GLAUCOGASTER, BREHM 



Plate 17 



"English— Light-bellied Brent ; in North America — Brant, Brent, Brand Goose, Common 



Brant, etc. 

 Russian — Belobryukhaya chemaya kazarka and kazarka belobryukhaya (J. A. Buturlin). 



I have given the synonyms of the light-bellied brent under the head of the typical 

 brent, because the former can scarcely be regarded otherwise than as a dimorphous form of 

 Branta bernicla, and also because by many authors it has been confounded with the latter. 

 I therefore here indicate only the works of those authors who record it as a distinct form, 

 and of those who undoubtedly had specimens before them, although they did not regard 

 them as distinct. 



Brent, Trevor-Battye, Ice-Bound on Kolguev (1895). 



Anser bernicla (partim), Middendorfif, Sib. R., ii. p. 288 (185 1). 



Anser glaucogaster (Brehm), Buturlin, Dikie gusi R. I. (" Psov. i Ruzh. Okhota," Febr.-Apr., 1901); id., 



Tablitsy apred. Plastinch. (" Psov. i Ruzh. Okh.," 1900); id., Sinoptich. tabl. Okh. Pt. R. I., p. 41 



(1901); Menzbier, Pt. Rossii, i. p. 724 (1895). 

 Branta bernicla glaucogaster, Bianchi, Yezhegodn. Zool. Muz. Imp. Ak. Nauk., 1902, pp. 325 and 333. 



Adult Birds of Both Sexes 



These are distinguished from the typical form only by the light mother-of-pearl 

 greyish belly and flanks with admixture of ochreous-brownish tint ; but according to Mr. 

 Trevor-Battye perfectly intermediate examples occur which it is impossible to assign to 

 their proper form. Upper part of body apparently in general somewhat lighter than in the 

 majority of the typical form. 



Other Dresses 



Correspond to those of brent, but at all ages lighter belly, 

 with those of B. bernicla, viz. : — 



Dimensions coincide 



Length . 

 Wing 

 Culmen . 

 Tarsus 

 Eggs : width 

 length 



596-774 mm. ( = 23.5-30.5 in.). 

 309-345 m m. (= 1 2.30-1 3.6 in.). 

 30^-38 mm. (= 1. 20-1. 5 in.). 

 53-61 mm. ( = 2.1-2.4 in.). 

 5 1 mm. ( = 2.02 in). 

 74 mm. (2.92 in.). 



158 



