9 
1903. | OSTEOLOGY OF THE CUCULIFORMES. 289 
d. Beak not exceeding the cranium in length, of medium size, and with a more or 
less strongly arched culmen. 
e’. Descending process of lachrymal vestigial or wanting ; temporal f oss 
meeting to form a sagittal crest; nostrils more or less markedly reni form, 
being formed like those of Rhinocoecyx by the confluence of the narial 
aperture with a superior fenestra. 
oe’. Descending process of lachrymal in form of delicate incurved st yle. 
a’, Sagittal crest reduced to a mere line.................. Rhopodytes. 
BUC a Sagittal Chest) DLOR ioc sesuenaceeaceaesesesstac-1 == Zanclostomus. 
d'’. Descending process of lachrymal reduced to a stump. 
Piaya. 
é’. Descending process of lachrymal wanting; antorbitai plate slightly 
Taccocoua. 
inflated nok CORO E a OCH CIO NE ATE CRO CER CE ECC EERIE: 
f’. Descending process of lachrymal moderately strong, bent outwards and 
backwards upon the supraorbital portion; temporal fosse meeting to form 
a broad sagittal crest. 
f’’. Horizontal process of lachrymal longer than descending ; pterygoid with 
dorsal keel; interorbital fenestra large ............... Guira. 
g'. Horizontal process of lachrymal not exceeding descending process, and 
having free orbital border sharply truncated ; interorbital fenestra small. 
Budynamys. 
temporal fossa meeting to form a 
g’. Descending process of lachrymal slender ; 
Centropus. 
broad sagittal crest ; interorbital fenestra very large ... 
h’. Temporal fossze confined to lateral aspect of skull. 
hk’, Lachrymal moderately large and not distinctly divided into supraorbital 
and descending processes; antorbital plate spongy ; interorbital fenestra 
large ; maxillo-palatines not meeting in middle line, but palate edged by 
MASA SOPLUMN eee ee eee cence earoe sere e nese pscacs Coua. 
i”, Lachrymal moderately large, with slender descending process ; nostrils 
ericular, just above base of tomium Secrets Coccystes. 
i’, Lachrymal vestigial; mandible with broad flange at gape. 
CU Memporall fossa) PLCSCMU e easawaesscccteraies sea sestr feleccia= Cuculus. 
: d’”’, Temporal fosse obsolete .............s0200ccresrssereeeee Cacomantis. 
B. VERTEBRZ’. 
All the presynsacral vertebra are free and heterocclous ; neural arch of atlas 
broad; hypapophyses blade-shaped, not extending beyond 2nd thoracic vertebra. 
Axis vertebra not conspicuously shortened antero-posteriorly, and not having 
conspicuously upturned hyperapophyses. 
A. Lateral borders of thoracic vertebra terminating in a sharp backwardly directed 
oe Mvsopuaal. 
RIDE Ghsoc cocoon: 096 CBB ASBROSHSERED ONRCES a0OC cad HONEEOOGO CoE 
B. Lateral borders of thoracic vertebre not produced into spikes. CUCULI. 
CG. PrecroraL GIRDLE AND STERNUM. 
Coracoid with a well-developed procoracoid; clefts of the posterior notches of 
sternum never extending as far forwards as the level of the articulation of the ribs ; 
furcula large. 
A. Procoracoid fused with acrocoracoid; furcula with a well-marked facet for 
articulation with the fused pro- and acrocoracoids ; anterior border of carina 
sterni continued forwards to level of spina externa ............. MUSoPHAGI. 
acrocoracoid; furcula without articular facet for 
¢ continued forwards as far as 
Cucutt, 
B. Procoracoid not fused with 
acrocoracoid ; anterior border of carina sterna no 
free end of spima externa ...........0e cece eee seeeee cee eee ne eee eee eee 
1 The presynsacral vertebr of the Cuculiformes are scarcely to be distinguished 
from those of the Coraciine and Leptosomine. 
Wg 
