AT 
saw an Attagen (Ariel, I believe) on the wing, I fancied that 
there was a strong resemblance between the two genera. 
As one difference between the European and Indian bird 
appears to consist in the smaller size of the latter. I give exact 
measurements derived from a number of specimens procured in 
various parts of the Himalayahs. 
Length, from 44 to 49. Expanse, 99 to 110. Weight, 
10 tbs. to 16 Ibs., average about 12 Tbs., Wing, from 30 to 
34; the 3rd primary, sometimes the 2nd and 38rd, sometimes 
the 4th and 3rd the longest. Ist primary from 3 to 5 shorter, 
never less; 2nd primary from 1 shorter to sub-equal, 4th 
at times sub-equal generally from 1 to 2, shorter. Tail 
of 12 feathers. Length of tail from vent, from 21 to 25; 
longest tail feathers exceed shortest by from 5 to 8. Tar- 
sus 3°9 to 4°7. Foot, greatest length, from 6°8 to 8; 
greatest width, from 5:2 to 6:3; mid toe froms to 3°6; 
its claw, along curve, from 1 to 1°6 ; hind toe, from 1:4 to 2; 
its claw along curve, from 1°45 to 2°1; inner toe from 1°5 to 
2; its claw along curve, from 1°5 to 2-05. Bill straight 
from edge of cere from 1:9 to 2-4. Bill, along curve from edge 
of cere, from 2°5 to 3:2; from gape from 4 to 4°7; width 
at gape, from 2°5 to 2°9; height at margin of cere, from 0°85 
to 1; length of cere, from 1°35 to 1-6. Distance by which the 
closed wings fall short of end of tail, from 4 to 6. Distance by 
which lower tail coverts fall short of tail, from 8°9 to 10°5. 
Of a fine adult male killed, September 3rd, the feet were 
plumbeous, the claws pale greenish horny. The eyelids dark 
plumbeous brown. The irides bright, very pale orange. (In 
some I have found them straw-coloured, but I have never seen 
them white without either a red or yellow tinge.) The bill 
was bluish horny at gape, greenish horny beyond, and dusky 
on point. Sclerotic membrane blood red. Above ; Lores, 
nareal bristles, a patch over the eye anda line joining the 
hinder portions of these patches, black. The top of the head 
white, with a tinge of rufous, and a few of the feathers black. 
Back of the head and neck and sides of latter pale ferruginous ; 
feathers about gape whitish mixed with black ; a black stripe 
from gape about 1:°5 long. Lower neck, (behind), upper back 
and lesser wing coverts, a rich brown, white shafted and conspi- 
cuously centered with white, or in some, fawn colour; lower back 
and upper tail coverts deep brown. ‘Tail, quills, and larger 
coverts, deep brown, with white shafts, many of the feathers 
powdered as it were with silver grey. Scapulars dark brown, 
more or less frosted with silver grey. Below; a conspicuous 
tuft of black bristles, (the longest fully 1 inch in length,) on the 
