REMARKS ON THE GENUS SULA, 307 



the whole tail, and the greater wing coverts blackish brown. It 

 differs moreover from all the preceding in having the naked 

 throat stripe prolonged down much further towards the breast. 



Habitat, Cape of Good Hope, &c. 



The Second sub-group has the lores, face to angle of 

 mouth, chin, and a portion of the throat defined by a curved 

 line (convexity downwards) from the gape on either side, bare. 



This includes cyanops (and if distinct dactylatra) , piscatrix 

 (and if distinct variegata), australis (and if distinct parva). 



With the three non-doubtful species we are more especially 

 concerned as all occur within our limits. 



4.— Sula cyanops, Sundev. Physiogr. Salksk. Tid- 

 skrift. 218. n. 1837. 



personata, Gould, P. Z. S. 1846, 21. 



melanops, Hartl. and Hengl. Ibis, 1859, 351, pi. X. f. 2, 



These three names * seem to be at present almost uni- 

 versally accepted as synonymous, and most modern writers 

 include dactylaclra, Lesson, of which more hereafter. 



But though accepted as synonymous, it must not be supposed 

 that the dimensions or descriptions given of this supposed 

 one species by different writers agree over well. On the con- 

 trary they differ most materially, as will appear from a few 

 quotations that I shall make. 



Von Heuglin (cyanops), Orn. Nord. Ost. Afr. 1481—1873 

 (who includes personata, Gould ; melanops. Hartl., and with a ? 

 dactylatra, Less.; and cyanops of Shelley) : — 



" White, scarcely tinged with fulvous ; quills, greater wing 

 coverts, tertiaries, and tail feathers smoky black ; quills with- 

 in whitish towards their bases ; bill olivaceous yellow ; bare 

 skin of face and chin deep black ; irides yellow ; feet dusky ; 

 webs almost black ; claws blackish horny, livid at the points. 



" Length, 30-7—31 '8 ; bill at front, 4-12 ; from gape, 

 4-92; wing, 178 — 181 ; tail, 7'67— 8*77 ; tarsus 21— 2-2." 



Gould {personata), P. Z. S. 1846, 21; B. of Austr. VII. 

 pi. 77. (cyanops) ; Handb. B. of Austr. II, 506 : — 



tl The whole plumage of both sexes is pure white, with the 

 exception of the greater wing coverts, primaries, secondaries, 

 and tertiaries, the tips of the two central and the whole of 

 the lateral tail feathers, which are of a rich chocolate brown ; 

 irides yellow ; naked skin of face and chin in specimen dull 

 bluish black ; legs greenish blue. 



* Other supposed synonyines are, piscator, Peale. U. S. Expl. Exp. Birds, 273,1848 

 nee Lin. ; bassana, Thomp. Allen. Exp. Niger, II, 175. nee. Lin. 



