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Show 13*9 14*1 15*2 16*8 16-9 . , 9*3 10*0 10*5 110 3*05 3*35 3*5 3*7 3*55 72 MR. R. B. SHARPE ON THE [Feb. 2, produce a uniform " Marsh-Harrier" plumage for their Harrier, while Reunion birds never show the striped breast; but these are characters which only a large series can determine. I subjoin the measurements of all these Harriers examined by me up to the present time. Total length, wing. tail. tarsns. in. in. in. in. Juv. Reunion (mus. Lugd.) .... 20 Ad. Reunion (mus. Lugd.) 20 Juv. Reunion (mus. Lugd.) .... 22 Ad. Joanna (mus. Norv.) 22 Ad. Madagascar (mus. Brit.) .. 22 Imm. Madagascar (type of C. macroscelis) 22 15*0 11 *0 3*85 The last three specimens are rather larger, though in measuring the tarsi of all with compasses in exactly the same way I cannot allow the last-mentioned bird 4 inches for his tarsns. The wing is rather abraded in this bird, and may measure longer in a perfect specimen. I subjoin a description of the typical example of Circus macroscelis, as well as of the adult bird now in the national collection. Immature (type of C. macroscelis). Above brown, most of the feathers with a faintly indicated paler margin, some of the interscapular feathers slightly tinged with rufous ; head and neck lighter than the back, the crown slightly washed with rufous and streaked with fulvous, the hind neck streaked with white, all the bases to the feathers being of this colour; eyebrow whitish, as also the sides of the face; the ear-coverts streaked with light brown, and entirely of this colour on the hinder margin ; cheeks also whitish, narrowly streaked with brown ; facial ruff fulvous, all the feathers broadly centred with dark brown ; throat dull whitish, slightly streaked with pale brown; rest of under surface of body fulvous, with broad rufous-brown streaks to all the breast-feathers, narrower and more indistinct on the under tail-coverts, the central streaks very narrow and linear on the thighs ; under wing-coverts coloured like the breast, but the streaks darker and not so rufous, the lower series whitish at base, ashy brown at tip, resembling the inner lining of the quills, which are fulvescent at base, browner towards the tips, with indications of several ashy brown bars ; upper wing-coverts brown like the back, many of them washed with rufous on their margins and having a whitish spot; primary coverts uniform brown like the quills, the primaries rather darker than the secondaries, which have a slight purplish shade, the inner primaries showing three or four dark bars, principally on the inner web ; upper tail-coverts pure white, many with two and all with a single subterminal spot of rufous brown; tail-feathers light brown, the centre ones shaded with ashy, the outer ones with rufous and crossed with six bands of darker brown. Total length 22 inches, culmen 1*6, wing 15, tail 11, tarsus 3*85. Adult. Above blackish, the feathers of the crown and hind neck margined with ochraceous buff or whitish, probably the remains of immaturity ; the dorsal feathers with a slight greyish lustre, some of |