22 CLASSIFICATION OF BIRDS. 
Suborder 16. BUCEROTES. 
The Hornbills may be diagnosed as follows :— 
A. Hallux present, and connected with flewor perforans digitorum.  B. Basipterygoid 
processes absent. C. Spinal feather-tract not defined on the neck. D. Episternal 
process perforated to receive the feet of the coracoids. 
Of the above characters the combinations A B © and C D are each diagnostic. 












a ir 
Biles = A 
A at wl. % mo|a2 o rs} < f 2 
eed . Alaa) |Raics n ala|o|2 5 S|ala : s| % -|a ec 
Aisle) 12/815! | se lgigi2l|2\25laleol|-lsl2is a} |8 steal lees 
Blaslzls/Slslelsleis| als Ss Sisliele Sl EiSlslSlsiel elalelelsisiel fete 
SiS lelS|SIS/s/Ha Sal SlalSrslela/SiSlorelfisgisleleis|S\ sla sisi slais 
STElS | A) S41 boa |S/e/S)2) Sis) So) s/o/S (S/S) s/8/S) ale S)elalale|ors|eis|8) Sis 
#/5(Slslalers lS 5 Slelrals (oss le)e2\slalalslels eels lee eas 81s 
3 H|Ss aati v “ 3/3 ies 3 | 5 ela |S | | 
VENI feed IO JO Jc | cpa J JF OF YO cs I YT SJ Le | I | | [1 [qa | Jo 
a |e AES ]25 | JOO |S> |S fa Jad [69 JH 1D |€O I 00 Joo |S | IN [od te} ~ fer) [od JH is |e 
les Rabie SONS VA YER PS SS IPS |S IS a [Sa (Ba 1 a I IGS ISI [3 [50 [0 [09 [09 crs [or 
A fk) |e | le | |e] |] | el | J Josefa | ae] ae fae fae | ae | ae fae foe | a ae fae ae | ae fe fe | | ae | 
Bs oe * | * nid | Pee! Ve Bel lao focet */.. *|* |... * * || x] oe] | 
Ci x|*)*| x x] xl ele] ee] x] |e] | Pale 2 * oe] enc 3] SR eect eet aaa ae 
D |x| *)*]«!..| ||] e] el] |e] a | fae | ae fae foe |v | ae | ae foe | oe fae | oe | oe [eee] ote | oe] oe] oe | 
i) 

























The absence of lateral bare tracts on the neck, which occurs for the first time in the 
Bucerotes, is a Struthionine character. 
The perforation of the episternal process to receive the feet of the coracoids is a character 
found in the Galline, the Bucerotes, and the Upupe. It also occurs amongst the Coracie 
in the family Meropide. 
