22. LAxius. 233 



b". Tail not exceeding 47, wing not ex- 

 ceeding 4-9 inches in lengtli. 

 «'". Uppertail-covertsaudbasalquarter 

 of tail-feathers white; large white 

 alar speculum. 

 «*. Inner web of some of the second- 

 aries entirely white ; wing 4- 7- 



4-8, tail 4-0-4-7 inches .7 leiicopterux, p •^4-> 



6'. Inner web of secondaries never 

 entirely white ; wing 4-G, tail 



,,„ ^, -l'^ iiiclies honmjeri, p. 242. 



b ■ Upper tail-corerts grey; basal pai-t 

 of taU blackish ^ 



e'. One large alar speculum ; flanks 



,, .y^iite . e%««s.p. 251. 



a*. Alar speculum broken up into 

 two alar bars in the folded 



/' T. <-T.^?°' ^^^\^ tinged with gi-ev exciihitor, p. 237. 

 b . Ease of both webs of all the secondarie's 

 blackish. 

 c". Plumage white ; very small alar spe- 



d". Rump grev. » P- --J • 



c'". Underpai-ts of body white strongly 



washed with vinous T. . meiidiomlis, p. 24G. 



it . Lnderpartsstrongly washed with 

 grey. 



C. BiU slender; wing not exceeding 



3-8 inches in length. (North , , , . . 



America.) J i^Movictanus, p. 245. 



f*. Bill stout ; wing more than i ' ^■^''"bitoroides, p. 240. 

 inches in leugtli. 

 a\ Length of bill about 0-75 inch. 



(Algeria.) alneriemis, p. 244. 



6'. Length of biU about 0-85 inch 

 and strongly hooked. (Soco- 



' c< c ^^^'^ " \ wmnatm, p. 245. 



c. borne of the secondaries black at the 

 base of the outer web, whilst the inner 

 web is white throughout or broadly 

 margined with white. 

 e". Undei-parts rermiculated. 

 e". Rump and upper tail-coverts white 



or creamy white borealis, r^. 2-kO 



J . Lpper and under tail-coverts 



creamy buff; nimp buff mollis, p. 241. 



/ . Undei-parts nut vemiicidated. 



!''','; I^iimpand upper tail-coverts white dealbatm, xi. 250 

 n . Kump and upper tail-coverts isa- 

 belline white; upper parts vei-y 

 pale grey, washed vrith isabel- 



,-, f}^'^ • • • ; .-, (jrimmi, p. 250. 



t . Kump and upper tail-coverts crey. 

 (I*. Fom- or six of the centrartail- 

 feathers entirely black. 

 c\ Length of wing 4-2 inches . . robitstus, p. 243 

 d\ Length of wing 4-8 inclios . . seebohmi, p. 243. 



