INDEX—INTESTINES 459 
which, L. impeianus (MONAL) was brought into notice by Sir Elijah 
and Lady Impey (¢f. Latham, Gen. Synops. B. Suppl. p. 209). 
INDEX, the second finger, in Birds always the best developed 
of the digits of the fore-limb. It frequently possesses the original 
number of three phalanges, and often bears a horny CLAW, especially 
in Ravir# and in the embryos of Accipitres and Anseres (see 
SKELETON). 
INDIGO-BIRD, so called from its deep blue colour, in part 
tinged with green, a well-known North-American species, the 
Cyanospiza, Spiza or Passerina of modern authors,! belonging to a 
small group of Finches or Buntings (for anatomy has not decided 
which), mostly of great beauty, rivalling some of the Tanagers in 
their bright plumage. American ornithologists give full accounts 
of the habits of this bird, together with those of its equally gay 
congener the Lazuli Finch, C. amena, and the still more gaudy 
Painted Bunting or NONPAREIL, C. ciris. 
INEPTI, Illiger’s name in 1811 for a “Family” of Birds 
consisting of the genus Didus (Dopo). 
INERTES, an “Order” proposed by Temminck in 1820 to 
contain the genera Apteryx (Kiwi) and Didus (Dopo). 
INSECTIVORES, Temminck’s third “ Order” of Birds in 18202 
(Man. d’Orn. ed. 2, i. pp. lvi-lxix. and 139), a name that has 
been used by a few other writers, but long since disregarded, not 
only as containing a very unnatural congeries of Birds, but as having 
been anticipated in 1817 by Cuvier’s Order of Mammals, Jnsectivora. 
INSESSORES,? the name given by Vigors in 1823 (Trans. 
Linn. Soc. xiv. p. 405) to the second Order of Birds in his classifica- 
tion containing nearly all the Pica and Passrres of Linneus, and 
practically equal to the Ambulatores of Illiger. Though long 
accepted without hesitation by most British | and many foreien 
authors, the composite nature of the group has now been recognized, 
and the use of the name is generally abandoned. 
INTESTINES originally signified all the soft parts within the 
1 Cyanospiza seems to be the right name, since Bonaparte in 1827 expressly 
stated (Specchio Comp. Orn. di Roma e di Filadelfia, p. 47) that the type of his 
Spiza was the Emberiza americana of Gmelin, which is not congeneric with the 
present species, though afterwards (Comp. List B. Eur. & N. Am. p. 35) retain- 
ing Spiza for this group. Passerina though older than either is by ancient 
practice wholly inadmissible, having been long before used in Botany. 
2 Often stated to have been given by him in 1815 (Man. d@’Orn. ed. 1, p. xx.). 
but he then used Canori for what is practically the same group. 
3 From the Latin inszdére to perch, not tncedere to walk, as is often supposed. 
