46 Mr. W.S. Macreay on certain Birds of Cuba. 
curvature of slender beak are common to the Certhiade and 
Grallatores ; while the Cuculide approach to the Rasores in such 
genera as Corythaix and Musophaga. The following table, 
therefore, will express several analogical relations of the utmost 
value. 
SCANSORES. INSESSORES. AVES. 
PsirTactp# representing the . . Drentiros7res, and therefore the . . RAPTORES. 
Ruampnastipx joining the . . Controstres, and forming part of. . INSESSORES. 
Cucuttp® forming part of the . Scansores, and joining the. ... . RASORES. 
CerTHIAD# joining the . . . . Trnurrosrres, and representing the GRALLATORES. 
Pictpm representing the . . . . Fissrrostres, and therefore the . . NATATORES. 
communem habet Picorum genert accedit.” And again, (p. 31,) in speaking of the 
affinities of the Woodpeckers, he says: ‘“ Addite sunt dus species Pici, tridactylus et 
semirostris, quorum hic affinitatem longinquam quidem, sed tamen aliquam cum Rhyn- 
chope, item semirostri ave; ille autern cum Alcedine tridactyla indicat.” Neither of 
these relations, however, are truly those of affinity ; that of Picus semirostris to Rhyn- 
chops being one of analogy; and that of Picus tridactylus to Alcedo being one of analogy, 
or if not, of the affinity of transultation. 
Jl. The 
