39. AQuiLA. 233 



Key to the Sijecies. 



a. Lower back and rump pure white verreauxi ad., p. 234. 



b. Lower back and rump fulvous or dark brown. 

 u. With white scapular feathers. 



a". Base of tail ashy grey, with black bands, 

 a'". Carpal plumes blackish, like rest of 



wing-coverts heliaca ad., p. 2.38. 



b'". Carpal plumes white, like scapulars . . adalherti ad., p. 239. 



b" . Base of tail white chrysaetus juv. (bcaihe- 



b'. Scapidars brown, either pale or dark, uniform lemyi), p. 235. 

 with rest of upper surface, 

 c". Under surface of body uniform. 



c"'. Basal half of tail uniform white chrysaetus]viw., p. 235. 



il". Tail brown at base. 

 «'. Tail uniform below. 



a^. Under surface of body blackish or 

 deep chocolate-brown. 

 «^. Larger: wing, c? 21'4 inches, 



2 20'o clanga ad., p. 248. 



¥. Smaller : wing, c? 19 inches, 



2 19-75 macidata ad., p. 246. 



V, Under surface of body pale fawn- 

 colour or ashy brown, 

 e". Larger : wing, S 25-25 inches, $ 



26-2 verreauxi juv., p. 234. 



d^. Smaller : wing, c? 23 inches, 



2 24-0 adalberti]vi\'., p. 239. 



e^. Smallest : wing, S 20 inches, 

 2 22-2. 

 «'. L'nderneath fawn-colour .... rapax ad., p. 242. 

 b'. LTiiderneath ashy brown .... rapax juv. (albicans), 

 6*. Tail more or less distinctly barred p. 242. 

 below. 

 c\ Much lai'ger : wing 22 to 27 inches 

 in length, 

 y*. Primary coverts entirely uniform chrysaetus ad., p. 235. 

 g^. Primary coverts with a pale ful- 

 vous tip, nearly an inch broad, mogilnik vixad.,p. 240. 

 eT. Smaller: wing not exceeding 22 

 inches in length ; primary coverts 

 narrowly paler at tip. 



c'. L^nderneath tawny vindhiana ad., p. 243. 



fF. Underneath ashy brown .... i-?«<//«V(«(rjuv., p. 243. 

 e'. Underneath dark brown. 

 «'. Small wing-coverts tipped 

 with white spots; nostrils 



rounded hastata ad., p. 248. 



5". Small wing-coverts unifoi-m, 

 or with narrow white mar- 

 gins ; nosti'ils oval tcahlhergii ad., p. 245. 



f. Underneath white, with a few 



brown bars tcahlber gii jny., p. 245. 



f/". Under surface of body parti- coloured. 

 e". Tail with bars underneath, 

 e*. Tail barred to the ba.se. 



