63 : [ Vol. xxxvmi. 
‘does not remain in the Maritime Plain. The hot, sand- 
laden Khary wind sets in in June, and the temperature 
goes up in jumps of 10° to 110° in the shade, and the 
conditions of life thereupon become intolerable for man and 
beast alike, with the change of the monsoon. For this 
period the Maritime Plain is practically devoid of all human 
and animal life. 
Dr. E. Harrert exhibited and described a new subspecies 
of Oriole, as follows :— 
Oriolus luteolus thaiacous, subsp. nov. 
The male of the Black-headed Oriole of Siam and neigh- 
bouring countries differs from that of O. luteolus luteolus in 
the much greater amount of black on the tail. While in the 
Indian typical form the three outer rectrices have no, or 
exceptionally very little, black, and the fourth is generally 
also entirely black or with a black spot on the inner web, 
in the Siamese form the black bar across both webs extends 
to the outermost or penultimate tail-feathers, though some- 
times the bar extends only to the third outer pair, while the 
two outermost pairs have only black patches on the outer 
webs or are, in two out of twelve birds, exceptionally quite 
yellow. Quite exceptionally one finds among O. J. luteolus 
specimens in which the bar extends beyond the two central 
pairs, and in one out of about a hundred to the penultimate 
pair. It seems that on an average the Siamese form has 
shorter wings, in adult males about 133 mm., which is the 
minimum in O. 1. luteolus, where they often reach quite 
140 mm. in length. Though this is a very variable character, 
there is also generally less yellow on the secondaries in the 
male of O. l. thaiacous. 
Hab. Siam, from the Malay Peninsula east of Tenasserim 
to Kompong-thom in Cambodia. 
Type: g¢ ad. Koh-Lak, Siamese portion of northern 
Malay Peninsula, east of Tenasserim, 17.xi. 1913, W. J. F. 
Williamson leg. Tring Museum. 
Besides the type, we have in the Tring Museum a pair 
