560 Recently published Ornithological Works . 
in limited areas, and hopes to arrive at more reliable conclu¬ 
sions from their joint evidence, both as to the earliest arrival 
of a species and the arrival of “ the bulk. 5 ' And “ the bulk/' 
which observers are specially requested to note, is that of 
flocks of different species rather than flocks of each separate 
species. The author considers, moreover, that in the case 
of individual records the best plan is to select the date at 
which the species had arrived at half of the stations, though 
he admits that even this method leaves room for error. 
By means of graphs curves may be traced of the move¬ 
ments of any particular form, and specimens are given of 
such curves compared with similar curves in each case for 
temperature. 
The method proposed appears to be an improvement on 
those used at present, and we shall watch with interest its 
fuller development. 
80. Van Oort on Birds from New Guinea. 
[Note XXI. On New Guinea Birds. II. By Dr. E. D. Van Oort. 
Notes Leyd. Mus. vol. xxx. p. 225.] 
Dr. Van Oort gives an account of three collections of 
birds from New Guinea lately received by the Leyden 
Museum. Two of these, from Western New Guinea, were 
presented by Mr. Palmer van den Brock and Mr. P. J. van 
Cloven, while the third (from the Owen-Stanley Mountains) 
was purchased of Mr. J. Henkelman. 
The specimens are referred to about 60 species and sub¬ 
species, amongst which Cyclopsitta desmaresti intermedia , 
Orthonyx temmincki victoriana (from Mt. Victoria, 12,000 ft.), 
and Macharirhynchus nigripectus harterti are described as 
new subspecies. Some good Paradise-birds are represented 
in the series— Cnemophilus macgregori, Pteridophora alberti , 
and Macgregoriapulchra. One adult specimen of the curious 
Paramythia montium from the Owen-Stanley Mountains is 
likewise catalogued. 
