350 Lord Walden on the late Colonel TkkelVi 



by Mr. Hume with D. virescens (Str. F. 1874, p. 473), belong 

 t ) D. trigonostigma 5 . 



The second phitc of the Dicaeinse contains two figures : — 

 No. 1, entitled Piprisoma agile, ex Borabhoom ; No. 2, Pri- 

 onochilus gordoni, Tickell, ex Mergui. This last is Diccmm 

 trigonostigma* (^ . 



It is difficult to assume that Colonel Tickell would figure a 

 difiierent 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 fromf. Tlic 

 bill is that of a true Dicaum, ; and the coloring and markings 

 more nearly resemble those of X>. chrysorhoeum than any other 

 species. It is certainly not Pipj'isoma 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. palpehrosa, T. 

 As I eaimot find that Blyth ever described this species in 

 prcciser 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 dn not 

 always belong to the .subjects of the letterpres.s, e.ff. D. 7iiinimu)n. 



