350 Lord Walden on the late Colonel Tickell’s 
by Mr. Hnme with D. virescens (Str. F. 1874, p. 473), belong 
13 D. trigonostigma $ . 
The second plate of the Dicseinae contains two figures :—- 
No. 1, entitled Piprisoma agile , ex Borabhoom; No. 2, Pri- 
onochilus gordoni, Tickell, ex Mergui. This last is Dicceum 
trigonostigma * $ • 
It is difficult to assume that Colonel Tickell would figure a 
different species under a title he was the first to give to a bird he 
first discovered; and yet it is impossible to recognize his figure 
of Piprisoma agile as belonging to that species. His delinea¬ 
tions are generally not only so beautiful, but so accurate, that 
we cannot permit ourselves to doubt that his figure of P. agile 
is a good representation of the bird it was drawn fromj\ The 
bill is that of a true Dicceum; and the coloring and markings 
more nearly resemble those of D. chrysorhceum than any other 
species. It is certainly not Piprisoma agile. Can it be the 
Prionochilus modestus, Hume (Str. F. 1875, p. 298), possibly 
founded on female or immature males of some known species 
of the genus ? In the letterpress Colonel Tickell correctly 
describes P. agile; but the bird figured has the upper plumage 
yellowish olive-green, without a trace of ashy, the upper tail- 
coverts more yellow than olive, and the whole under surface 
albescent, with longitudinal streaks of olive-brown. 
Zosterops siamensis, Blyth (Ibis, 1867, p. 34), is well figured 
and described by Colonel Tickell, from the Mooleyit range, 
under the title of, and confounded with, Z. palpebrosa , T. 
As I cannot find that Blyth ever described this species in 
preciser terms than those given in the short passage where 
he bestowed that title (/. c.), I append a short description 
and give a figure of the bird (Plate IX. fig. 1). Above yel¬ 
low olive-green, the yellow tint being prominent and most 
developed on the uropygium and upper tail-coverts, forehead, 
and space before the eye; underneath, axillaries, and under 
wing-coverts bright yellow; quills and rectrices pale brown, 
edged more or less with the colour of the back. Lores 
* Colonel Tickell was not acquainted with the genus Prionochilus. 
t It has been already shown that the subjects of the plates do not 
always belong to the subjects of the letterpress, e.g. D. minimum. 
