of the Order Insessores Heterogenes. 421 



My third order, — Strepitores, (that is to say, the Heteroge- 

 nes, or those Insessores of Mr. Vigors's arrangement which 

 have a simple vocal apparatus), — sub-divides into three prin- 

 cipal groups, or sub-orders, which may be designated from 

 the prevalent construction of the foot, — Syndactyli, Zygodac- 

 tyly, and Heterodactyli. 



The Syndactyli next fall into two divisions : those with the 

 hinder edge of the sternum singly emarginated, only ten tail- 

 feathers, and sober-coloured plumage, — Buceroides; and with 

 a doubly-notched sternum, twelve tail-feathers, and generally 

 gay plumage, — Halcyoides. Of groups of the next degree of 

 value, the Buceroides can be resolved into one only, — Arcui- 

 rostres, comprising the two families of hornbills, (Buceridce), 

 and hoopoes, ( Upupida) ; while the Halcyoides require to be 

 divided into three, — Cylindrirostres, composed of the three 

 families of bee-eaters, (Meropidce), rollers, [Coracidte), and 

 kingfishers, (Halcyonidce) ; — Angulirostres, consisting of the 

 todies, (Todidce), and jacamars, (Galbulidce) ; — and Serrati- 

 rostres, or the motmots, (Prionitidm). 



The Zygodactyli also range in two primary divisions ; the 

 first having- a more muscular stomach, no cceca, and an ac- 

 cessory plume to the clothing feathers more or less developed, 

 — Picoides ; the second with a more lax stomach, great cae- 

 ca, and no trace of the accessory plume, — Cuculoides : the 

 former are remarkable for the length of the coracoid bones. 

 The Picoides then sub -divide into Levirostres, or the two fa- 

 milies of toucans, (Rhamphastidce), and touracos, (Mnsopha- 

 gidce), which latter requires to be farther separated into the 

 sub-families Musophagince, composed of the plantain-eaters, 

 (Musophaga), touracos, (Corythaix), and nape-crests, (Chi- 

 zhceris); and Colino, consisting of the colies, (Colius); — and 

 Cuneirostres, comprising also two families, those of the bar- 

 bets, (Bucconidce), and woodpeckers, {Picida), the latter di- 

 visable into Piciance, or the genera piculet, {Picumnus), wood- 

 pecker, {Picus), and wryneck, (Yunx) ; and Indicatorince, 

 composed of the honeyguides, (Indicator) : the Cuculoides, 

 in my present state of knowledge, I can venture only to range 

 in two families, those of the puff-birds, (Tamatiadce), which 

 perhaps require to be first separated into Tamatianw, or the 

 puff-birds, (Tamatia and Lypornyx), and barbacous, (Mona- 

 sa ; and LeptosomincR, or the courols, (Leptosomus) ; — and of 

 the cuckoos, (Cuculidce), which should range in three sub -fa- 

 milies, Cuculince, or the cuckoos, [Cuculus and Chalcites), 

 and rain-fowl, ( Scythrops) ; — Centropodince, or the couas, 

 (Coccyzus), coucals, (Centropus), malkohas, (Phamicophceus), 

 &c. — and Crotophagincd, or the ani, (Crotophaga). 



