SIGMODUS RETZII 471 
wing. Iris yellow, eyelid and wattle red, bill red, yellow at the tip, feet red. 
Length 8:5 inches, wing 5:1, tail 3:8, culmen 0°65, tarsus 0:9. Oliphant 
River, 2, 7. 85 (W. Ayres). 
Immature. Has the head and under parts brown like the back. Oliphant 
Vlei (Andersson). A still younger bird has a narrow white terminal barring 
to the feathers above and below, giving it a mottled appearance, and broad 
whitish ends to some of the wing-coverts; the bill is dusky. Gazaland 
' (Swynnerton). 
S.r. mgricans. Differs from S, retzii only in the much greyer and more 
slaty shade of the back and wing-coverts. Wing 5:35. Maconjo (Anchieta). 
S. 7. intermedius. ‘ Differs from S. re¢ziz in the paler and more hair brown 
colour of the back and wing-coverts. Wing 5:20.” Neumann. 
S. r. tricolor. Differs from S. retzit and S. 1. intermedius in the still 
paler brown colour of the back and in its smaller size. Wing 4:7. Tete 
(Kirk). 
S. 7. graculinus. Differs from all the other subspecies in the absence 
of the white on the inner webs of the wing feathers ; colour of the back and 
wings even paler than in S. 7. tricolor. Wing 4:9. Mombasa (Wakefield). 
The typical form of this species was discovered by Wahl- 
berg on the Doughe, or, as it is now called, the Okavango 
River. It is found throughout the northern part of Bechuana- 
land and extends eastwards into Mashonaland, where it merges 
into S. r. tricolor. 
S. r. mgricans takes the place of the typical form in 
Angola. Neumann’s description is based on examples obtained 
at Malange, north of the Quanza, and he confines his sub- 
species to this region, but Reichenow extends its range to 
Loanda in the north, to Benguella in the south, and the 
Congo region in the. west. Examples from Maconjo, in 
Benguella, and from Humbe, in Mossamedes, as well as two 
specimens from Katanga, obtained by Neave, all in the 
British Museum, seem undoubtedly referable to this form. 
S. r. intermedius was founded by Neumann on an example 
collected by himself at Muanza, on Lake Victoria, and, 
according to him, is distributed all over the country between 
that lake and Tanganyika. J have seen no examples of this 
form. 
