SUDAN BIRDS

CATALOGUE OF SUDAN BIRDS.KEY TO FAMILIES.fPart II.PASSERIFORMES.f Tarsus rounded posteriorly andj divided into scutes ... ... 2I Tarsus ridged posteriorly and not[_ scutellated ... ... ... ... 4fBill strongly hooked at tip; hind„ J claw normal ... ... ... 3| Bill not hooked at tip ; hind claws(_ more or less straight and elongated Alaudidm, p. 13...f First primary shorter than theJ secondaries ... ... ... ... Laniidce (part), p. 61.] First primary longer than the(_ secondaries ... ... ... ... Prionopidce (part), p. 69.'First primary rudimentary andhidden ; outermost obvious primarymore than half as long as the4. •i next, often the longest. " Nineprimaried" ... ... ... ... 5j First primary obvious, though some-(_ times small. " Ten primaried " ... 8~f Loiigest primary more than twice asJ long as longest secondary ... Hirufidinidce, p. 57,| Longest primary less than twice as{_ long as longest secondary ... 6f Bill short, thick and more or less f Fringillidce, p. 106.6. < conical \Ploceidm (part) %.I^Bill thin and slender ... ... 7- f A conspicuous white ring around eye Zosteropidce, p. 78.\Ho white ring around eye ... ... Motacillidm, p. 19.f Larger, wing over 310 mm. (exceptj Ptilostomus, with wing over 1508. -*[ mm.); nostrils entirely covered byI stiffened feathers ... ... ... Corvidce, p. 72.(_ Smaller, wing mostly under 150 mm. 9„ fNo obvious rictal bristles ... ... 10\Kictal bristles conspicuous ... ... 16fBill short, thick and more or less10. < conical ... ... ... ... 11[Bill not conical ... ... ... 12,. /Larger, wing over 110 mm. ... Bubalornithidce, p. 83.\Smaller, wing under 110 mm. ... Ploceidm (part), p. 84.f—Compiled from various sources.J—The sub-family Passerinm, which is now usually regarded as belonging to thePloc&idw and not to the FringiUidm, is for reasons of simplicity worked in with theFiillid in the key to the species.11