34 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



undated skins taken by Eisenhofer at Khun Tan, which are in the 

 museum at Stockholm and which have wings of 185 and 186 mm. 



While no other examples have been collected in our area, I believe 

 this heron is a rather rare resident in the northern provinces. I have 

 more than once, during the summer months, seen green herons, which 

 probably belonged to this race, along quiet jungle streams, but did not 

 then realize the importance of taking a specimen. 



Gyldenstolpe records that his bird had the irides yellow, the maxilla 

 black, the mandible yellowish green, the feet and toes yellowish brown. 



The South China green heron, like the preceding form, is distinguish- 

 able only by its wing length, which ranges from 180 to 195 mm. 



Mayr suggests (Emu, vol. 43, 1943, pp. 11-12) that the Chinese forms 

 of the green heron never reach Sumatra in winter and that the name 

 actophilus must be synonymized with that of some race resident in the 

 Malaysian islands. If his view be correct, the bird here discussed will 

 be known as Butorides striatus connectens Stresemann (Orn. Monatsb., 

 vol. 38, 1930, pp. 48-49). 



BUTORIDES STRIATUS JAVANICUS (Horsfield) 



Javanese Green Heron 



Ardea Javatvica Horsfield, Trans. Linn. Soc. London, vol. 13, 1821, p. 190 



(Java). 

 Butorides striatus javanicus, de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 



1929, p. 5S7 (Chiang Mai). — Dfjgnan, Journ. Siam Soc. Nat. Hist. Suppl., 



1931, p. 173 (Chiang Mai) ; 1936, p. 73 (Chiang Mai). 



This form of the green heron appears in small numbers in the 

 northern provinces at the end of the rains, apparently as a result 

 of a northward movement after breeding in more southern districts. 

 A similar phenomenon has been observed in numerous species of 

 herons in other parts of the world. 



At Chiang Mai it is found along the river and occasionally at 

 sloughs in the ricefields, from September 20 to October 16; an 

 exceptionally late bird was taken by de Schauensee, January 2, 1929. 

 I have one specimen which was collected at Thattafang, October 11, 

 1936. All northern examples which I have examined have been 

 birds of the year; their wing length varied from 174 to 180 mm. 



This seems to be the only green heron likely to occur in settled 

 districts and along the large rivers. On the Mae Ping I used to 

 find it settled quietly on rocks and snags under the shelter of the 

 high banks, where, it was difficult to observe except from a boat. 

 When disturbed, it utters a loud squawk and flaps slowly and low over 

 the water to a similar hiding place farther along the stream. 



Immature specimens taken by me had the irides yellow; the eye- 

 lids greenish yellow ; the lores yellow-green ; the maxilla black, with 



