MONOGRAPH OF THE FALCONIDH3, 
artificial nest, feeding the young ones from the crop, and pairing 
with one mate, &c.* 
If we transfer these analogies to the Accipitres, we shall find 
that the S trig idee, on account of their large ear-holes, very sharp 
hearing, most nimbly built body, very long wings, and according 
to their analogies with the Caprimu Iginee (fourth subfamily' of 
the second family Hirundinidee), must occupy the second rank as 
a family of the Accipitres. 
If from the Ornithes, Fissirostres, and Strigidee, we apply the 
analogies to the Falconidee , we find that the swallow type, Nau- 
clerus, claims the second rank as genus, and Milvinee as sub- 
family. In Nauclerus, we see short secondary and long quills, 
extremely short tarsi, which are broad near the toes, short toes, 
deeply forked tail, of which the exterior feathers are much longer 
than the middle ones. This is a swift flyer and eater of insects. 
The analogies abstracted from the Ornithes, Fissirostres, Stri- 
gidee, and Nauclerus, assign the second rank to the following 
genera, in which these characteristics partly appear. 
In the first subfamily, Falconince, the subgenus, Erythropus, 
of the genus Tinnunculus, shows a short hand and long quills, 
short tarsi and toes, feeding on insects, flying after food until 
twilight. By these characteristics, Erythropus (T. vespertinus ) 
assumes the second rank as subgenus. Erythropus claims to itself 
and to Tinnunculus , as genus, the second rank to Falconince. 
In the third subfamily, Acdpitrince, we observe in the genus 
Nisus, and subgenus Tachyspizia ( solcensis ), the most pointed 
wings, the smallest nimblest and most graceful forms, and minutest 
nearly imperceptible scales on the tarsi, which resemble the booted 
foot of many Ornithes. 
In the fourth subfamily, Aquilinoe, we find in the genus Helo- 
tarsus, the longest and most pointed wings, a short doubly forked 
tail, great agility in flying, and some analogies with the Strigidee. 
In the fifth subfamily, Buteoninee, the genus Pernis shows many 
analogies to the Cuckoo and Doves, and like the Ictinia and Nau- 
clerus, a broad sole of the hind-toe, and very short tarsi. They 
commonly feed on insects and their eggs. 
* How the doves could have been separated as an order from the Gallince, even 
m our days, is not easily conceived, by those who had eyes only for analogies, the 
affinities were not discerned. 
105-18 
