266 Allen's naturalists liiirary. 



absolutely distinct from one another and occupying widely dif- 

 ferent geographical areas, there can be no doubt that, given a 

 large enough series of specimens from the intervening country 

 between the headquarters of any two, a chain of intermediate 

 forms would be found, and the extreme types would be shown 

 to grade imperceptibly into one another. For the sake of 

 clearness the accompanying sketch-map of Burma has been 

 prepared, showing the countries in which each form occurs, 

 the range of the three principal forms being shown by the 

 shaded areas marked A, B, and C, while the places where 

 the intermediate birds are known to occur are marked AB, 

 BA, &c., thus indicating their affinities to one or other of the 

 main types. Thus G. cuvieri is marked AB, which shows that 

 it is most nearly aUied to G. horsfieldi (A), and less nearly 

 related to G. liiieatus (B); while in G. oatesi, indicated by the 

 letters BA, the reverse obtains. 



The Black-breasted Kalij (A) ranges over a large part of 

 Northern Burma, extending in the north to Eastern Bootan, 

 in the west to Chittagong, south to the Northern Arakan Hills, 

 and east as far as Bhamo. 



The Vermicellated Kalij (B) is met with in Pegu as far west 

 as the valley of the Irrawady, in Northern Tenasserim and 

 North-western Siam, and, according to Gates, extends up the 

 Irrawady Valley as far as Bhamo, though this latter state- 

 ment requires confirmation, 



Anderson's Kalij (C), first obtained in the Kachin Hills 

 east of Bhamo, has since been met with at Dargwin, and is 

 probably found from that place northwards along the Salween 

 Valley to Yun-nan, but its range is not yet defined. 



It must first be stated that A does not intergrade with the 

 Black-backed Kalij of Sikhim and Western Bootan, and ij 

 the ranges of the two birds do overlap in Central Bootan, 

 which they probably do not, no intermediate birds have as yet 

 been recorded. 



The Northern Arakan Hills is the most southern uoint 



