46 Aves 
in. AVES. 
[ 1904 ] 
Order ACCIPITRIFORMES. 
Falconidse, their economic value in N. America ; see Surface, H. A. 
(621). 
Serpentarius serpentarius (fig. 1) and S. orientalis (fig. 2), figured ; 
Erlanger, J. Ornith. 1904, taf. iv. 
Gyps fulvus and allies ; Erlanger, J. Ornith. 1904, pp. 139-148 : G. f: 
fulvus, figured ; id. t. c, taf. i : G. f. rueppelli , figured ; id. t. c. 
taf. ii. 
Pseudogyps afncanus (Salvad.), figured ; Erlanger, J. Ornith. 1904, 
p. 149, taf. iii, fig. 1 : P. a. schillings j, n. subsp., German East Africa ; 
id. t. c. p. 150, taf. iii, fig. 2 : P. a. fUlleborni , n. subsp., Nyasa Land to 
Angola ; id. t. c. p. 151, taf. iii, fig. 3 : P. a. zechi , n. subsp., Togo 
Land ; id. t. c. p. 1 52, taf. iii, fig. 4. 
Polyborus cheriivay , nesting habits ; Schutze, Condor vi, pp. 106-108. 
Polyboroides pectoralis, not distinct from P. typicus ; Sharpe, Ibis 1904, 
pp. 98 & 99. 
Urotnorc/ds macrurus, young described ; Sharpe, Ibis 1904, p. 99. 
Melierax canorus and allies, figured, with characters of upper tail-coverts 
(taf. v, figg. l-5c, 6-8), M. c. canoi'us (taf. v, fig. 1), M. c. poliopterus 
(taf. v, fig. 2), M. c. metabates (taf. v, fig. 3), M. c. mechowi (taf. v, fig. 4), 
M. c. poliopterus x M. c. metabates , figured ; Erlanger, J. Ornith. 
1904, pp. 161-165, taf. v : M. polyzonus (Rupp., nec Less.) must stand 
as M. metabates Heugl., Salvadori, Ibis 1904, pp. 248-250. [Cf. 
Reichenow, Vog. Afrikas i, p. 544.] 
Micronisus niger niger (Senegal, N E. Africa, Nile districts to N. German 
E. Africa) and M. n. carbonarius (Licht., from S. German E. Africa 
to South Africa); the differences noted ; Erlanger, J. Ornith. 1904, 
pp. 179-182. 
Astur , habits of West African species ; Bates, Ibis 1904, p. 597 : A. 
palumbarius , supposed breeding in Gloucestershire ; Grant, Bull. 
B. O. C. xiv, p. 74. 
A. tachiro tachiro , from Somali Land ; Erlanger, J. Ornith. 1904, 
pp. 168 & 169 : A. unduliventer , its characters ; Neumann, J. 
Ornith. 1904, p. 360: A. castanilius = A. unduliventer ; Grant, Ibis 
1904, p. 278 : A. castanilius , young described ; Sharpe, Ibis 1904, 
p. 99 : A. tousseneli , young described; id. t. c. p. 100 : A. torquatus 
wallacei , from the S.W. Islands, Moluccas ; Hartert, Nov. Zool. xi, 
pp. 189 & 190. 
Lophospizias trivirgatus, nest and eggs described ; Bourdillon, J. Bombay 
Soc. xv, p. 672. 
Accipiter nisus nisus from Abyssinia ; Erlanger, J. Ornith. 1904, pp. 170 
& 171 : A. hilgerti , n. sp., Arusi, Galla Land, N. E. Africa ; id. t. c. 
p. 171, taf. vi : A. ladygini , n. sp., E. Tibet ; Bianchi, Annuaire 
Mus. St. Petersb. viii, p. 11, 1903: A. rufiventris perspicillaris is the 
N. E. African form of A. rufiventris ; Neumann, J. Ornith. 1904, 
p. 360: A. rufiventris rufiventris and A. r. perspicillatus, notes on 
their geographical distribution ; Erlanger, J. Ornith. 1904, pp. 172 
& 173 : the latter from Togo Land ; id. t. c. p. 173 : A. minullus and 
its allies ; id. t. c. pp. 173-178 : A. m. tropicalis , figured ; id. t. c. 
p. 176, taf. vii : A. m. minullus (fig. 1), A. m. intermedius , n. subsp., 
Abyssinia, S. Shoa; id. t. c. pp. 173-176 (fig. 2), figured ; id. t. c., 
taf. viii : A. batesi , n. sp., Camaroons ; Sharpe, Ibis 1904, pp. 100 
& 101. 
Buteo , observations on the colour-changes in the genus ; Birtwell, Bull. 
(Jniv. New Mexico iii, No. 7, pp. 3-14. 
Buteo augur and B. auguralis , remarks on ; Neumann, J. Ornith. 1904, 
pp. 362-364: B. buteo and allies, B. ferox and allies ; id. t. c. pp. 365- 
