318 HEM AUKS ON THE GENUS SOLA, 



Finsch and Hartlaub say positively that Tschudr's description 

 shows clearly that his bird is only the young of piscatrix, and 

 that Von Pelzeln's recent endeavour to establish the distinctness 

 of this species rests on equally untenable grounds. 



To whom replies Salvadori that variegata of which he has 

 seen many specimens is absolutely distinct from piscatrix. 



In this conclusion, a careful comparison of measurements, 

 descriptions, the black feet, and the fact that myriads of the 

 bird described by Tschudi were seen, and none of piscatrix in- 

 clines me to concur. 



6.— Sula australis, Steph. Gen. Zool. XIII,104, 1826. 



sula, Lin. S. N. I. 218, 1766. 



fiber j Lin, apud auct, nee. Lin. 



? brasiliensis, Spix. Av. Bras. II. 83 to 107, 1825. 



fulica, Less. Tr. d'Orn. 601, 1831. 



plotus, Forst. Descr. An. 278, 1844 



? flavirostris, Gould, apud Licht. Forst. ib. 



sinicadvena, Sioinh. Ibis, 1865, 109. 

 It is inconvenient that I can find no sufficient reason for 

 sub-dividing this genus, as adopting as one must Brisson's genus 

 Sula, I am unable to adopt Linnaeus' specific name sula, 

 which undoubtedly belongs to this species, whereas his 

 other name fiber, which has of late always been assigned 

 here, equally certainly does not belong here. Fiusch and 

 others have already pointed this out, but as they adopt Illiger's 

 genus of Dysporus for this section, they are able to adopt the 

 Linnsean specific name sula, founded on Brisson's uninomial 

 Sula. 



The next name in order of priority is Stephen's, if we except 

 brazilie?isisi the application of which to this species, referring 

 as it does to a quite young bird, is very doubtful. 



I said that fiber, Lin. did not apply. This is founded on 

 Sula fusca of Brisson. Brisson's description of his Sula, our 

 present species is as usual full and excellent, as his always are 

 when he described from a specimen. 



"Length,* 31*78; bill from gape, 5 -02 ; tail, 10*7 ; tarsus, 

 1*82 ; mid toe and claw, 3*3; * * * expanse, 65*7. * * 



" The head, throat, neck, back rump, the scapulars, and upper 

 tail coverts ashy brown ; breast, belly, tibial plumes, lower 

 tail coverts, and flanks white. #*****#** 

 " The iris light grey ; naked skin of head yellow ; bill grey ; 

 feet pale yellow; nails grey." 



# Compare the dimensions recorded by myself from a fresh bird, (S. F,, IV, 483.) 

 L. 31 7 ; B. fr. g., 5 - l j tail, 80 (I measure from v nt, he to root), expanse, 62. 



