47 
dimensions, which does not belong to any of the preceding species. 
The bill is reddish on the root ; the under parts are lighter than on 
the young cayanus; the stripes are more obsolete, and are reduced 
on the side as black shaft-stripes; shafts of the tail reddish brown ; 
under tail and interior wing-covers white, without spots. 
Ps. cayanus. Ps. maximus. 
When ewe es oe. ik Oke een OO 
Gape. . . 35 35 
nals) esluel Pangea eee T2Q he setters 129 
Le dae Ra FORE eat 73 
Height of the bill ..... 11 13 
Breadth: spo. Akt Wy ge: eeperas 133 
It would be very interesting to discover the old bird of this species. 
d. Subgenus Erator. 
It unites the size, colourmg and formation of the second hand- 
feather of the true Psaris with the bill and feathered lorum and eye 
region of the other subgenera. 
This little subgenus, with its mixed characters, gives the clearest 
proof that Psaris, Pachyrhamphus and Bathmidurus cannot be con- 
sidered as true genera. 
12. Ps. rwquistror, Orb. Lanius inquisitor, Olf. 
Diag.—Tail black. 
Descr.—The male with black head and white ear-covers, connected 
with a white collar, which divides the black head from the silver-grey 
body ; tail black, at the root white, which extends to the margins of 
the inner webs; end of the tail without white band ; the second hand- 
feather on the inner web white. 
The female (Jardinii, erythrogenys, Selbyt, and Nattereri, Sw.) 
with white front and rufous ear-covers. 
13. Ps. Fraseru, Kaup. (Aves, Pl. XXXVII. XXXVIII.) 
Diag.—Tail two-thirds white, with black white-bordered end. 
Descr.—The head to the ear-covers black ; ear-covers and under 
the posterior part of the eye white; the second hand wing-feather 
light ash-grey, with white root. 
The dimensions of these two species are nearly the same :—head, 
52; gape, 32; height of the bill, 10; breadth, 14-15; wing, 105- 
113; tail, 63-70. 
I give to this very distinct species the name of a very able zoolo- 
gist, who is going a second time to Western Africa. From this jour- 
ney we may anticipate the greatest benefit to our science, and we wish 
Mr. Fraser the best success. For all his kind assistance in the col- 
lection of Lord Derby I give him my best thanks. 
e. Subgenus Baramrpurvs, Cab. 
They have the bill like Chloropsaris, Pachyrhamphus and Erator, 
but the tail in most of the species is more graduated. The colouring 
