462 BULLETIN 17 2, UNITED STATES NATIONAL MUSEUM 



April 19, 1930; one male, Khun Tan, August 27, 1930; one male, 

 Mae Hong Sorn, January 9, 1933; one immature male, Doi Hua Mot, 

 August 30, 1934. Dr. Smith collected a nest and three eggs at Pak 

 Chong, May 17, 1925. 



The form is a lighter, less purplish blue than prophata, the belly 

 more extensively white, and the light tips to the tail feathers larger 

 And more pronounced. 



Wlien I named montana, specimens from southeastern Siam were 

 unfortunately taken to represent styani. I am now satisfied they are 

 closer to prophata. No specimens from Hainan have been available 

 for comparison, but it is certain that birds from northern and eastern 

 Siam are racially different from those from the south, and for the 

 present the name styani can be employed for them. The few north- 

 '€rn specimens examined are not quite the same as eastern Siamese 

 .specimens, the tip of the tail being more extensively white, but they 

 are so close that it is best to merge them. 



Ten males from eastern Siam measure: Wing, 68-77 (72.6); tail, 

 68-78 (73.4); culmen, 12-13 (12.5 mm). Three males from northern 

 ,Siam: Wing, 72.5-75 (73.5); tail, 70-74 (72.3); culmen, 12-13.5 

 (12.5) mm. 



The range of this form is apparently from Hainan and South China 

 through Tonldn, North Annam, and French Laos to eastern, northern, 

 ;and western Siam, Burma, and Assam. 



De Schauensee ^^ found it common in North Siam; Dr. Smith in 

 •eastern Siam ; and Chasen and Kloss ^* report it from the Raheng 

 District, western Siam. Gyldenstolpe *^ says it is common through- 

 out Siam proper. 



HYPOTHYMIS AZUREA FORRESTIA Oberholser 



Hy-pothymis aztnea fnrredia Oberholser, Proc. U. S. Nat. Mus., vol. 39, p. 601, 

 1911 (Loughborough Island, Merqui Archipelago). 



Dr. W. L. Abbott collected the typical series of this form in the 

 ^fergui Archipelago, the type (an adult male) on Loughborough 

 Island, January 23, and an ndult male and two females on Sullivan 

 Island, February 3 and 4, 1900. 



This form does not differ markedly from prophata; the males are 

 possibly a duller blue. The difference is one chiefly of size, and for 

 such a small series this is not so startling. The male from Sullivan 

 Island is considerably lighter in color and smaller than the type. 



The two males measure: Wing, 76-79; tail, 75-77; culmen, 12.5- 

 13.5 mm. The two females: Wing 73.5-75; tail, 73-75; culmen, 

 12.5-13 mm. 



So far as known the form is confined to the Mergui Archipelago. 



" Proc. Acad. Nat. Sci. Philadelphia, vol. 81, p. 54«, 1930. 

 " Journ. Slam Soc. Nat. Hist. Suppi , vol. 7, y.. 173, 1928. 

 « Ibis, 1920. p. 573. 



