Genus — C I E C U S . 
Type C. mruginosus. 
Type C. pygargus. 
Type C. pygargus. 
Type C. pygargus. 
Type C. nmcropterus. 
Type G. assimilis. 
Type G. pygargus. 
Medium-sized Aquiline birds with short bills, long wings, long tail and 
long legs with rather small feet. The word Aquiline ” is here used in the 
sense of the classification of Suschkin, who separates the “ Aquiline ” birds 
from the Falconine. 
The biU is small, sharply hooked, with a cere at the base in which the 
nostrils are placed ; the under edges of the upper mandible are sinuated but 
not toothed ; the bill is deep at the base and rather broad ; the nostrils are 
oval apertures placed near the cuhnen ridge, with no bony obstruction 
apparent internally : they are hidden by bristles developed on the lores ; 
the under mandible is shallow, not hooked. 
The wings are long, with the first primary short, the third or fourth 
longest, the first four quills emarginate on both webs. The tail is composed 
of twelve feathers more than half the length of the wing. 
The legs are long, the toes rather short ; the tibia is also long but 
covered with feathers which extend on to fore portion of the tarsus but not 
on the back. 
Gmcus Daudin, Hist. Nat. Buffon, ed. Didot, 
Quadr. Vol. XIV., p. 221, 1802 (ex Lacepede 
Tabl. Ois., p. 4, 1799 ; nom. nud.) 
Pygargus Koch, Syst. Baier. Zool., pp. xxxii., 127, 
1816 
Strigiceps Bonaparte, Comp. List Birds of Europe 
and N. America, p. 5, 1838 (ex Giom. Arcad. 
Eoma, Vol. XLIX., p. 36, 1831 : nom. nud.) 
Glaucopterix Kaup^ Class. Saugeth. u Vogeh p. 113, 
1844 . . 
Also spelt — 
OlaiUMpteryx Kaup, Mua. Senckenb., Vol. III., p. 258, 1845. 
Spizacircus Kaup, Mus. Senckenb. ^ Vol. III., p. 258, 
1845 
Also spelt — 
Spiziacircus Kaup, Archiv. fur Naturg., 1850, p. 32. 
Spilocircus Kaup, Isis 1847, p. 89 
Pterocircus Kaup, Archiv. fiir Naturg., 1850, p. 32 
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