26 Aves. 
XV. Aves. 
[1921] 
625. — Sabin, F. R. Studies on the 
origin of blood vessels and of red blood 
corpuscles as seen in the living blasto- 
derm of chicks during the second day of 
incubation. Contr. Embryology 9 No. 
36 pp. 215-262 6 pis. 1 text-fig. Wash- 
ington (Carnegie Inst.) 1920 4to. 
626. — Sajovic, G. Ornitologicn 
zapiski za kranjsko v letih 1914 do 
1916. [Ornithological notes for Carniola 
from 1914 to 1916 and 1917-18.] 
Carniola Ljubljani (i.e., Lenbach) 8 1917 
pp. 70-93, 9 1918 p. 177-187 figs. 
627. — Salvadori, T. ed Festa, E. 
Missione zoologica del Dott. E. Festa i 
Cirenaica. Uccelli. Roll. Mus. zool. 
anat. comp. Torino 36 No. 738 pp. 1-5. 
628. — Saunders, A. A. The song 
periods of individual birds. Auk Lan- 
caster Pa. 38 1921 pp. 283-284. 
629. — Saunders, A. A. A distribu- 
tional list of the Birds of Montana. 
Pacific Coast Avifauna No. 14 of the 
Cooper Ornithological Club pp. 1-194 
map and 35 figs. Berkeley Cal. 1921 8vo. 
630. — Schaanning, H. T. L. Bjer- 
kreim-Orren. Lyrurus tetrix bjerkreim- 
ensis subsp. n. pp. 1-2 8 pis. 3 text-fig. 
1 map. [No date or place of publica- 
tion.] 
631. — Schaanning, H. T. L. Tabel- 
larisk Oversikt av Norges Fugler. 
Norsk. Orn. Tids. Stavanger No. 1 1921 
pp. 9-24 map. 
632. — Schaanning, H. T. L. Ring- 
fugler. En oversikt av det inter- 
lias; onale ringmerkningsarbeide sant 
Norges andel i samme. Norsk. Orn. 
Tids. Stavanger No. 1 1921 pp. 29-44. 
633. — Schaanning, H. T. L. Norske 
trekkfugl-undersokelser igangsatt ved 
Stavanger Museum i mars 1920. Norsk. 
Orn. Tids. Stavanger No. 1 1921 pp. 50- 
73. 
634. — Schalow, H. Uber das Vor- 
kommen von Erismatura leucocephala 
Scop.) in Thiiringen. Verhandl. Orn. 
Ges. Bay. Miinchen 15 1921 pp. 43-44. 
635. — Schenk, J. Vogelzugsdaten 
aus Ungarn. iii. Jahrgang 1920. 
Aquila Budapest 27 1921 pp. 39-55. 
636. — Schenk, J. Des Vorkommen 
der Eiderente in Ungarn. Aquila Buda- 
pest 27 1921 pp. 266-269. 
637. — Schioler, E. L. A short de- 
scription of the sequence of plumages in 
some Palaearctic surface-feeding Ducks. 
Brit. Bds. London 15 1921 pp. 130-138. 
638. — Schioler, E. L. Sushkins 
Gaas, Anser neglectus, Sush. truffen i 
Danmark. Bartrams Klire, Bartra- 
mia longicauda (Beclit.) ny for Den- 
mark. Dansk. Orn. Tids. 15 1921 pp. 
37-47 9 text-figs. 
639. — Schlegel, R. Beobachtungen 
und Untersuchungen an sachsischen 
Schwanzmeisen, A egithnlos candatus 
europaeus (Herm.). Verhandl. Orn. 
Ges. Bay. Miinchen 15 1921 p. 51-57. 
640. — Schlegel, R. Wie man falsche 
Kuckuckseier als solche leicht bestim- 
men kann. Zs. Oologie Neumark 25 
1920 pp. 8-12. 
641. — Schlegel, R. Bemerkungen 
fiber die Eier einiger zentralasiatischer 
Arten. Zs. Oologie Neumark 25 1920 
pp. 29-35. 
642. — Schlott, M. Der Merlin ( Falco 
ce salon ) als Brutvogel im Riesenge- 
birge. Ornith. Monatsb. Berlin 29 1921 
pp. 97-98. 
643. — Schmidt, R. Ueber Eier mit 
blauer Ringbildung. Zs. Oologie Neu- 
mark 25 1920 pp. 69-73. 
644. — Schmidt, W. J. tiber die gelbe 
Farbung der Mundhohle junger Vogel. 
Verhandl. nathist. Ver. Bonn. 75 1919 
pp. 169-188 pi. iv. 
Schmitt, C. vide Stadler. 
645. — Schmitz, P. E. Vom See 
Genesareth. Ornith. Monatsb. Berlin 
29 1921 pp. 12-14. 
646. — Schneider, K. M. Fulmarus 
glacialis in Sachsen. J. Ornith. Leip- 
zig 69 1921 pp. 41-45. 
647. — Schneider, K. M. Urinator 
arcticus in Thiiringen. Ornith. Monats- 
ber. Berlin 29 1921 pp. 52-53. 
648. — Schneider, K. M. Eine Lichter- 
scheinung an fliegenden Vogeln. Orn. 
Monatsb. 29 1921 pp. 98-101. 
Schnitnikow, W. vide Menzbier. 
649. — Schnurre, O. Die deutsche 
Vogelfauna in ihren Beziehungen zu 
den Siedlungen des Menschen. Ber. 
Senckenb. Ges. Frankfurt-a. M. 51 1921 
pp. 13-17. 
