. Bulletin of the British Ornithologists' Club. tail 68 mm, culmen from skull 15 mm, tarsus Dimensions: Wing 75 mm, 18 mm. For comparison, the following are some measurements of virens from eastern Zaire:— Wing i°6*o* 73-78(75-0 10$$ 69 - 74(71-2) We? 76-78(76-7) 4?? 7o-73(7i-8) It can thus be stated that there is no difference in size between hallae and virens. Locality Vicinity of Kamituga Vicinity of Maboya Tail 65 - 72 (67-9) 63 -69 (65-7) 70- 73 (71-2) 66 - 69 (67-8). Plate. Tail and anterior of underside of (left) Andropadus virens, (right) A. hallae. On the other hand, hallae differs fr
. Bulletin of the British Ornithologists' Club. tail 68 mm, culmen from skull 15 mm, tarsus Dimensions: Wing 75 mm, 18 mm. For comparison, the following are some measurements of virens from eastern Zaire:— Wing i°6*o* 73-78(75-0 10$$ 69 - 74(71-2) We? 76-78(76-7) 4?? 7o-73(7i-8) It can thus be stated that there is no difference in size between hallae and virens. Locality Vicinity of Kamituga Vicinity of Maboya Tail 65 - 72 (67-9) 63 -69 (65-7) 70- 73 (71-2) 66 - 69 (67-8). Plate. Tail and anterior of underside of (left) Andropadus virens, (right) A. hallae. On the other hand, hallae differs from virens in having a tail clearly less graduated (see Plate), and it should be emphasised that there is no question of the tail of the specimen being in moult. Thus the difference (D) between the longest rectrices and the external ones is merely 3 • 5 mm in hallae, whereas I have found that for various specimens of virens from the same region the value of D is appreciably greater: 8 • 3 mm for the average of males and 7-4 mm for the average of females (see Table). The specimen of hallae was obtained in primary forest by my hunter KaJinde Musiko, who insisted on the fact that the place of collection did not correspond with the normal habitat of virens, which is nevertheless very widespread in this region as a whole. Thus it seems that ballot must be a bird of primary forest. The altitude of collection being 990 m, I assume that it is a form associated with transitional ( between montane and lowland) forest, and very probably only in a narrow altitudinal belt. It may also be noted that the gonads of the type of ballot were slightly enlarged (5 X 3 and 3X2 mm), indicating without doubt the proximity t the breeding season (perhaps starting in October). i39. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original wo
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