278 TICIDM. 



with black. Total length 8-5 inches, culmen 1-3, wing 4-9, tail 3-2, 

 tarsus 0"78 ; toes (without chiws)^outer anterior 0-4G, inner ante- 

 rior 0--1, posterior 0-54. 



Adidt female, summer plumaye. Wants the yellow crown, the 

 feathers of this region having white tips and black bases. With 

 the exception of this sexual distinction, it resembles the adult male 

 in summer. Total length 8 2 inches, culmen 1-15, wing 4*78, tail 3'1, 

 tarsus 0-78. 



Aduli, luinter ])lumaije. The back and the under surface of the 

 bodj- arc pure wliite and uniform ; all the up})er tail-coverts tipped 

 with white or spotted with white on the tip ; the lateral tail-feathers 

 are less barred with black and sometimes without a trace of bar or 

 spot : axillaries pure white, and the under wing-coverts sometimes 

 unspotted ; the white spots on the quills occasionally contliient. 



Hah. Central and Northern Siberia, and Kamtschatka. 



a. S imm. sk. Siberia. Tweeddale Coll. 



b. 2 ad. sk. Krasnoyarsk, Central Siberia, Tweeddale Coll. 



Oct. \H. Seebohm). 



2. Picoides dorsalis. 



Picoides dorsalis, Baird, B. N. Amer. p. 100, pi. Ixxxv. fig. 1, cJ 



(1858) ; Malh. Ficid(S, i. p. 179 (1861) ; Cass. Froc. Acad. Bhilad. 



18G3, p. 20.3; Gray, List Picid. Brit. 3Iits. p. 31 (18U8) ; id. 



Havd-l. B. ii. p. 181, no. 85-38 (1870) ; Merriam, U. S, Geol. Sun: 



Terr. 1872, p. 694. 

 Tridactylia dorsalis. Cab. Sr Heine, Mas. Hcin. iv. p. 26 (1863). 

 Picas dorsalis, Sundev. Consp. At. Ficin. p. 14 (1866). 

 Picoides americauus, var. dorsalis. Coop. B. Calif., ed. Baird, i. 



p. 386, head figured (1870) ; Coues, Key N. Amer. B. 1872, p. 194 ; 



Allen, Bull. M. C. Z. iii. p. 180 (1872) ; Coues, B. N.- West, p. 285 



(1874) ; Hensh. U. 8. Geoyr. Surv. W. of 100th Merid. 1875, p. 391. 

 Picoides tridactyhis dorsalis, Ridyiv. Froc. U. S. Nat. Mus. 1880, 



p. 189 ; Drew, Auk, 1885, p. 17 ; Hensh. op. cit. 1886, p. 78. 

 Picoides americanus dorsaUs, Coues, Check-list N. Amer. B. 2Dd ed. 



p. 78 (1882) ; id. Key N. Amer. B. 2nd ed. 1884, p. 485 ; A. 0. U. 



Check-list N. Amer. B. p. 214, no. 401 b (1886) ; Ridyw. Man. 



N.Amer.B.-p. 287(1887). 

 Picoides americanus (non Brehm), Hartl. J.f. 0. 1883, p. 275. 



Adidt male. Jlesembles P. tridactylus, but differs in having the 

 lateral tail-feathers uniform ; the rump is more spotted with white, 

 and there is also very much less Ijlack on the sides of the chest and 

 body, hanks and thighs ; the under tail-coverts have more of the apical 

 portion white, and the black on the basal portion does not show ; 

 the dimensions are also less. Total length 8 inches, culmen 1*27, 

 wing 4'85, tail 2-8, tarsus 0*88 ; toes (without claws) — outer ante- 

 rior 0*4.5, inner anterior 0'4, posterior 0-53. 



Adult female. Wants the yellow patch on the top of the head, the 

 crown being blue-black sparingly spotted with white; there is also 



