62 Zoological Society. 



the posterior part of the eye white ; the second hand wing-feather 

 hght 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 Bathmidurtjs, Cab. 



They have the bill like Chloropsaris, Paehyrhamphtis and Erator, 

 but the tail in most of the species is more graduated. The colouring 

 of it is black, with white or yellow end spots. Size of a Fmch. The 

 predominating colour of the males is black, white and grey. 



In this little subgenus we have different type-species, about which 

 the different subspecies arrange themselves. One of these is 



Ps. MARGINATUS. 



Head-feathers black, on the tip with steel-blue ; wings black ; 

 shoulder- covers, wing-covers and arm-wings white marginated ; tail 

 graduated, black with broad white tip. 



The female has all the margins and the under parts rufous yellow, 

 the back greenish, and the head darker coloured. 



a. Ps. MARGINATUS MINOR. 



Lorum and a small line on the front whitish ; ear-covers, back part 

 of the neck, lower part of the back light grey ; upper part of the 

 back black ; all the under parts white with grey tint ; the abnormous 

 second hand-feather white, on the exterior web on the root vrith a black 

 spot, and from this spot till the end ; along the shaft on the interior 

 web a small long black stripe. ' 



b. Ps. MARGINATUS MAJOR. Bathmidurus major. Cab. 

 Lorum and a small line on the front whitish ;• before the eye a 



black spot of bristle -feathers ; the shoulder-covers all white ; over- 

 back black ; the abnormous second hand-feather longer, white, with 

 a small stripe along the shafts on both sides. 



C. Ps. MARGINATUS TRISTIS, Kp. 



Without a small white line on the front ; lorum and the whole 

 head black ; the feathers on this part are more massi^'e on the tip, 

 and have more lustre ; the shoulder-covers only on the tip white ; 

 the whole neck and upper part of the back black ; lower part of the 

 back, ear-covers and all the under parts dark grey, mixed with black ; 

 the tail has not so much white on the tip ; the mider side of the wings 

 with smaller white margins ; the second abnormous hand wing-feather 

 on the inner web whitish with grey spots, on the outside black, with a 

 grey margin on two-thirds of the upper part ; the emargination on the 

 tip very distinct. 



Mus. Derb. 



