render its separation from them difficult. The Golden-green Ara9ari is assuredly a Pteroglossus;
the Grooved-billed Ara9ari differs from it only in the still greater simplicity of its colouring,
and in the greater development of those peculiar characters of the bill which show themselves
to a certain extent in Pter. prasinus.
If, in the preceding account of the species of Ramphastidce, I have rarely referred to the
form of the bill as aiding in their discrimination, it is not to be attributed to any undervaluing
of the important help to be thence derived, but to the difficulty of adequately conveying in
words a correct idea of those varying shades of difference which are appreciable only by a
practised eye and on direct comparison. My principal object has been to facilitate the
ascertaining of the species of this interesting family, and I trust that I may have, to a certain
extent, succeeded. In furtherance of the same view, I add the subjoined tabular attempt at
a Synopsis Specierum.
S Y N O P S I S S P E C I E R U M.
I. Caudà breviore, quadratà : rostro maximo. Nigri ; gutture caudaque tegminibus discoloribus.—R am ph a st o s .
Caudse tegminibus superioribus flavis.
Pectore albo.
Rostro ut plurimum nigro, lateribus compressis . . 1 . culminatili.
pi convexis . . . 2. Cuvieri.
i rubro . . . . . . 3. erythrorhynchus.
Pectore pallidè lutescente . . . . . . . . 4. citreopggus.
flavo • • • • • . . . . . 5. osculans.
Caudae tegminibus superioribus albis.
Pectore a l b o ................................................................................................ 6. Toco.
flavo.
Rostro p luricolore 7. carinatus.
obliquè dimidiatim f l a v o 8. Swainsonii.
Caudse tegminibus superioribus coccineis.
Rostro nigro.
Auribus a lb i s ...................................................................................... 9. vitellinus.
pectori concolo ribus, (se. flavis) , . . 10. Ariel.
Rostro viridescente.....................................................................................1 1 . dicolor us.
II. Caudà longiore, gradatà: rostro majore. Viridescentes ; capite, gastrceo, tegminibusque caudce superioribus in plurimis
discoloribus.—P t e r o g l o s su s .
Gastneo bi- vel pluri-colore, coloribus discretis.
Pectore ventreque flavis, fasciatis.
Fascià ventrali coccineà, latà.
Maxillse superioris lateribus sordidè albis
---------------------------obliquè dimidiatis nigris .
Fascià ventrali anticè nigrà posticè coccineà.
Pectore maculà nigrà notato . . . . . .
torque latà nigrà cincto . . . . .
Pectore coccineo.
Torque pectorali vel nullà vel angustà, flavà
---------------------- latissima, nigrà . . . .
Pectore ventreque flavis, baud fasciatis.
Maxillà superiore dimidiatim flavà et aurantiacà
-----------------------flavà, nigro inscriptà.
Maxillà inferiore nigrà . . . . . .
-----------------------superiori concolore . . . .
Pectore gutturi concolore, ventre discolore.
Maxillà superiore nigro maculatà,
albescente . . . . . . . .
ut plurimum rubrà.
apice concolore . . . . . . .
•^4— nigrescente.
Maxillis nigris,
basin versus r u b r i s ...........................................................
paullum cinerascentibus . . . . . .
Gastrseo unicolore, vel subunicolore.
Gastraeo stragulo discolore.
Gastrico flavo, rubro intermixto. . . . .
coeruleo-cano . . . . . .
flavo . . . . . . . .
Gastraeo stragulo subconcolore.
Crisso discolore.
Mandibulae superioris basi flavescente.
-----------------------------------nigro. . . .
Crisso concolore.
Uropygio concolore.
Rectricum apicibus concoloribus
iutermediarum duarum apicibus castaneis.
. . . . . . .
Uropygio coccineo . . . . . .
1. Aracari.
2. castanotis.
3. regalis.
4. pluricinctus.
5. bitorquatus.
6. Azaree.
1 1. Humboldtii.
12. inscriptas.
13. maculirostris.
14. Nattereri.
15. Reinwardtii.
16. Culi/c.
17. Lan 1
7. ulocomus.
8. hypoglaucu
9. Bail lo ni.
18. prasinus.
19. pavoninus.
20. sulcatus.
21. Derbianus.