THE BIRDS OF NORTHERN THAILAND 165 



only from December to February, it occurred at the edge of the ever- 

 green between 4,600 and 5,500 feet, once at 2,300 feet. I have taken it 

 on Phu Kha, April 9, 1936, and at Ban Hai Huai Som, June 18, 1936. 

 In addition, I have of this genus a juvenile male from Muang Fang, 

 July 10, 1936, and a juvenile female from Chiang Mai, November 27, 

 1936, which, in the absence of certainly identified comparative mate- 

 rial, I place only provisionally with the present species. 



The specimen from Phu Kha, which is not quite in full nuptial 

 dress (retaining a few white bars on the throat), had the testes inac- 

 tive. The bird from Hai Huai Som is completing a molt from the 

 juvenal plumage to one like that described by Ticehurst (Ibis, 1939, 

 pp. 15-16) as the dress of "the adult male in winter." 



The Phu Kha example had the irides bright brown; the eye ring 

 coral; the bill orange, tipped blackish; the tongue yellow; the feet 

 and toes slate ; the claws black. 



The adult male has the throat, breast, and entire upperparts shin- 

 ing green, glossed on throat, breast, wings, and back with golden- 

 bronze, on the quills with blue; the remaining underparts barred 

 white and bronzed green. The adult female has the crown and nape 

 rufous, changing to coppery green on the remaining upperparts ; the 

 outer rectrices rufous, marked with white and green; the entire un- 

 derparts barred white and shining copper. The juvenile is entirely 

 barred above with rufous and greenish brown, below with white and 

 brown; it is perhaps indistinguishable from the juvenile of the violet 

 cuckoo. 



CHALCITES XANTHORHYNCHUS LIMBORGI (Tweeddale) 



Tenasserimese Violet Cuckoo 



Chnjsococcyx limhorgi Tweeddale, Proc. Zool. Soc. London, 1877, p. 3G6 ("under 

 the Mule-it range, east of Moulmain," Tenasserim ) . 



The violet cuckoo must be extremely rare in northern Thailand and 

 the only record for its occurrence is based upon two adult males shot 

 by my collector from the top of a high tree near Ban Mae Wan (in 

 the hilly country between Chiang Mai and Wiang Pa Pao), February 

 21, 1937. 



The adult male has the throat, breast, and entire upperparts shining 

 violet-purple ; the remaining underparts barred white and violet, the 

 latter color glossed with blue and green. The adult female has the 

 crown and nape dull dark brown, changing to copper-brown glossed 

 with greenish on the remaining upperparts ; the underparts like those 

 of the adult female emerald cuckoo. 



The chords of the wings of my specimens measure 104.4 and 106.9 

 mm.; those of four adult males from Sumatra (assumed to represent 

 true xanthorhynchus) range from 92.6 to 95.4 mm. 



