1.^6 ON THE CLASSIFICATION OP BIRDS. 
suckers ; and, after tracing their connection with the 
swallows, the swallows with the hee-eaters, and the 
bee-eaters with the kingfishers, we finally return to the 
point whence we started. 
(176.) The other genera associated with the trogons 
deserve attention : we have already mentioned the pecu- 
liar broad hill of the great jacamar. Between this bird 
and the trogons are placed the different species of 
motinots {Prionites 111.) ; one of which has the hill 
greatly depressed, and all, like the genuine trogons, 
have the margins toothed or serrated. Ifiaced, therefore, 
at the extremity of this family, the motmots appear to 
connect the trogons with the jacamars, while at the 
same time they effect that important union with the 
scansorial birds which we have already mentioned. 
(177.) The analogies between the foregoing families 
and the principal lUvisions or tribes of the perching birds 
have already been mentioned. It nevertheless becomes 
a question, whether the Qiprimulgidte should not be 
considered as typical of the Fm-iroDtres, rather than 
that station should he assigned to the llirttndhi.idtB, 
upon the same principle as that which makes the Picida, 
and not the Pmttacidie, the chief type of the Smnmres. 
The Caprimulgida: and the Picidee are each pre-eminent 
in that particular organi,satiou which belongs to their 
own circles, just as the ITimndinida; and the Piritlacidm 
have the greatest general perfection of structure in all 
other respects. If, then, the analogies are to be thus 
founded, the families of the Fissirostres, and the tribes 
of the Insessores, will each follow in their true chain of 
affinities, without that transportation seen in the table 
Vol. I. p. 36'0. — thus: 
t'™ hTical groups. ^ 
Fissirostres. Pursue their prey on the wing. Meropidec. 
Temirostres. Bill very long, slender, entire. Halci/onida;. 
‘leotisores ■ f Wings short, convex ; bill short, arched :7 „ 
scansores. . ^ Trogmtdee. 
