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aurfiH niauNDO. wMtVia 



295 



than that of under parts, and more continuous, though sometimes 

 there is but littlu diflurencc in the 8ltade. The space just posterior 

 to the collar generally appears lighter than on the belly. Usually, 

 however, the rufous wash of 'uidor parts i i decidedly paler than that 

 of throat and forehead ; sometimes quita pale ; in only ono or two 

 instances as light as European specimens (as 6,020 and 29,294). In 

 such cases, however, the absence of broad jugular band of continuous 

 black, and the shorter tail, will distinguish from the European bird. 



There is an occasional tendency to a widening of the jugular 

 colliir, especially in young birds, but this is so much mixed with 

 rufous feathers as to be easily understocd. 



In young birds the frontal chestnut band is considerably reduced 

 in size, and generally paler and duller in color. 



The largest specimen of U. hor "oruvi I have seen is No. 19,542, 

 from Fort Ilae. Here the wing measures 4.90, and the tail 4.50 

 (the usual length of tail is under 4.00) ; the next largest specimen 

 being No. 34,349, from the Rocky Mountains. The maximum length 

 of tail in specimens of H. rustica, of Europe, befou me, is 5.00 — 

 the average being perhaps 4.50. 



The series of specimens from western America is not sufficient to 

 determine whether there is any essential difiference ; the bill, however, 

 appears decidedly smaller. 



I regret very much that the specimens from South America* at my 

 command are too few to make a satisfactory comparison with tho 

 North American bird. There appears, however, to be a difference 

 in a rather smaller bill, and in having the gloss of the upper parts 

 steel green, rather than purple or violet. I am, however, much 

 inclined to doubt whether there is auy specific difference. The 

 chestnut brown of the forehead is quite as deep and extensive as in 

 the northern bird, although Burmeister describes it as whitish, pass- 

 ing behind into rust-yellow, and speaks of the whole under parts 



' Hirundo erythrogaater. 



Uirundo ery thro (faster, BoDD. Tabl. PI. enl. (724, fig. 1), 1783, 45 (Cay- 



eniie).— ScLATER, Catal. 1861, 39 (Brazil). 

 Hmtndo tufa, Gm. S. Nat. I, 1788, 1018 (PI. enl. 724, fig. 1).— Burm. 



Ueb. Ill, 148 (Brazil). 

 Hirundo cyanopyrrha, Vieill. Nouv. Diet. XIV, 1817, 510. 



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