The genus Mixornis differs from all other genera of slender-billed Timaliinae in having the nostrils oval, exposed and not covered by a membrane, or scale, as in the others. "Within Indian and Burmese limits we have but one species which varies con¬siderably in different countries, forming subspecies or geographical races which are not always easy to define.
Key to Subspecies.
A. Crown pale ferruginous, stripes on fore-
neck and breast fairly well developed .. M. r. rubricapilla, p. 273.
B. Crown more pale brown, less ferruginous,
stripes on fore-neck and breast very fine. M. r. minor, p/274.
C. Crown more chestnut-rufous, stripes on
fore-neck and breast decidedly heavier.. M. r. pileata, p.1274.
Having examined several hundred specimens of this little bird in the British Museum and Tring Museum as well as those in the Indian Museum and my own collection, I have come to the conclusion that we cannot recognize more than three races of Mimrnifr as coming within the limits of this work. Rippon's sulphurea is an exact replica of many Assam and Bengal birds and the Southern Shan States appears to be about the limit of this form. Northern Siam specimens, from which Gyldenstolpe names his M. minor, are certainly nearer South and Central Siam forms, as also are specimens, from East Central Burma, so all these birds must bear his name.
Kloss's connectens I cannot separate from pileata the South Malay form and his name therefore becomes a synonym of that bird. Variation inter se is so great in the birds of this species that it is quite unsafe to found geographical races on anything but very large series.