313 
1921 .] in the B. O. U. List of British Birds. 
p. 224. For Genus Calidris substitute 
Crocethia Billberg, Synop. Faun. Scand.i. pt. 2,1828, 
tab. A, p. 132. Type by monotypy Tringa arenaria 
Linn., since Calidris is preoccupied (cf. Richmond. 
P. U. !S. Nat. Mus. liii. p. 581, and Auk. 1920, 
p. 443). 
The only species is Crocethia alha (Pallas) (see 
above). 
p. 225. For Genus Machetes substitute 
Philomachus Anonymous, Allg. Lit. Zeit. 1804, vol.ii. 
col. 542. Type by monotypy Tringa pugnax Linn. 
(cf. Richmond supra). 
p. 241. Charadrius. The type of this genus by Linnean 
tautonymy is C. hiaticula Linn, not C. apricarius , and 
the species listed under PEgialitis must become 
Charadrius. 
For Genus Charadrius substitute 
Pluvialis Brisson, Ornith. v. p. 42, 1760. Type by 
tautonymy P. aurea Brisson = Charadrius apricarius 
Linn. 
p. 243. Genus Squatarola Cuvier, Regne Anim. i. 1816, 
p. 467. Type by monotypy and tautonymy Tringa 
squatarola Linn. 
The reference to Leach in the B. 0. U. List is to 
an unpublished name, as Leach’s work, though printed, 
was never published. 
p. 290. For Genus CEstrelata substitute 
Pterodroma Bonaparte, Coinptes Rend, xlii, 1856, 
p. 768. Type by subsequent designation (Coues, 
Proc. Acad. Nat. Sci. Philad. 1866, p. 137) Procel- 
laria rnacroptera Smith. 
p. 312, For Genus Caccabis substitute 
Alectoris Kaup, Skiz. Entw.-Geschichte u. Nat. Syst. 
Eur. Thierw. p. 180, 1829. Type by monotypy 
Perdix petrosa Gmel . = P.barbara Bonn. {cf. Hartert, 
Nov. Zool. xxiv. p. 275). 
SEll. xi.— vol. 11 r. 
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