ON ARACHNOTHERA LONGIROSTRA (LATHAM). 195 
(Sf), the wing from 58 (QQ) to 69 mm. (FF); the 
yellow of the under parts is rather pale. 
The ten specimens from the Natoena Islands (Boengoe- 
ran) collected by A. Everett (Hartert, Nov. Zool. I, 1894, 
p. 469) are distinguished by their shorter bill; also their 
wing is, as a rule, shorter. The bill measures from 31 (QQ) 
to 35 mm. (0c); the wing from 58 (GQ) to 64 mm. (Sf). 
I propose to separate this form under the name of Arach- 
nothera longirostra rothschildi nov. subsp. The yellow of 
the under parts in this form is the same as that of the 
examples from Sumatra etc. 
The two specimens, both males, from Serasan (Sirhassen) 
of the Zeeroovers Islands differ from those of the Natoena 
Islands by having a somewhat longer bill (35,5 and 40 mm.) 
and more agree with specimens from Borneo, also by the 
somewhat brighter yellow of the under parts. Already Everett 
has stated, that this island belongs, zoologically, to Borneo 
(Nov. Zool. I, 1894, p. 468). 
The eight specimens from Nias differ from the Sumatran 
ones by their longer bill, 88 mm. (QQ) to 42 mm. (J'{); 
by their, as a rule, longer wing 62 mm. (QQ) to 70 mm. 
(J'&') and by the very pale yellow of the under parts. 
I separate this form under the name of Arachnothera lon- 
girostra niasensis nov. subsp. 
The two specimens from the Mentawei Islands (Si oban, 
Pora), both females, have a shorter bill (33 and 34 mm.) 
than those from Nias, and agree more, also by the 
stronger yellow of the under parts, with specimens from 
Sumatra than with those from Nias. 
The specimens from Borneo are distinguished by the 
brighter yellow of the under parts; they have also a long 
bill, 34 mm. (QQ) to 42 mm. (S''), and a long wing, 
61 mm. (QQ) to 70 mm. (Sf). I name this form after 
my friend Dr. Büttikofer, who collected a fine series of 
it: Arachnothera longirostra biittikofert nov. subsp. 
The specimens from Java are, as a rule but not always, 
a little brighter yellow at the under parts than those from 
Notes from the Leyden Museum, Vol. XXXII. 
