The Liotrichinae comprise those members of the Crateropodidae which are strictly arboreal, and in which the sexes are differently coloured. The first character separates them from the Brachypteryginae, and the second from all the other subfamilies.

The genera Aethorhynchus and Aegithina have two moults a year, and thus show affinities with the Sylviidae. The other genera have only the usual autumn moult.

The genera Cephalopyrus and Hypocolius are migratory to some extent. The other genera are sedentary.

All the Liotrichinae, so far as is known, lay spotted eggs. Minla and Myzornis may prove to be exceptions to this general rule, but the evidence regarding these two genera is incomplete and unsatisfactory so far as it goes.

Key to the Genera.

a. First primary about half the Length of second.

a1. Tail considerably shorter than wing.

a2. The secondaries falling short of tip of wing by a distance not greater than half the Length of tarsus.

a3. Tail-feathers curved outwards…………………..LIOTHRIX, p. 221.

b3. Tail-feathers straight.

a4. Upper tail-coverts falling short of tip of tail by less than the Length of hind toe…………………..CUTIA, p. 222.

b4. Upper tail-coverts falling short of tip of tail by about the Length of tarsus.

a5. Tarsus much longer than middle toe with claw.

a6. Bill stout, strongly notched and hooked at tip.

a7. Bill about half the Length of head; culmen well curved…………………..PTERUTHIUS, p. 223.

b7. Bill as long as the head ; culmen nearly straight…………………..AETHORHYNCHUS, p. 228.

b6. Bill slender and very little deflected at tip.

c7. Width of bill behind the nostrils equal to half the Length of bill from that

point to tip…………………..AEGITHINA, p. 229.

d7. Width of bill behind the nostrils equal to a third of Length of bill…………………..MYZORNIS, p. 233.

b5. Tarsus shorter than middle toe with claw…………………..CHLOROPSIS, p. 234.

b2. The secondaries falling short of the tip of wing by a distance fully equal to Length of tarsus,

c3. Head not crested; tail square…………………..IRENA, p. 239.

d3. Head crested ; tail graduated…………………..MELANOCHLORA, p. 241.

b1. Tail and wing about equal in Length.

c2. Outer tail-leather falling short of tip of tail by a distance equal to Length of tarsus…………………..HILAROCICHLA, p. 243.

d2. Outer tail-feather falling short of tip of tail by a distance less than half the Length of tarsus.

e3. Bill notched.

c4. Depth of closed bill at the ante¬rior corner of nostril mush greater than the width at same…………………..MESIA, p. 244.

d4. Depth at same point equal to the width…………………..MINLA, p. 245.

f3. Bill entire…………………..LEPTOPOECILE, p. 240.

b. First primary about a sixth the Length of the second.

c1. Tail shorter than wing.

e2. Nostrils overhung by numerous fine hairs…………………..CEPHALOPYRUS, p. 247.

f2. Nostrils not overhung by hairs…………………..PSAROGLOSSA, p. 248.

d1. Tail longer than wing…………………..HYPOCOLIUS, p. 250.

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