316 liecentlij published Ornithological Works. 



use of polynomials in zoology, and in reply to the assertion 

 that "there is no other and better method ' of designating 

 variations in form not sufficient for specific separation, ex- 

 plains a plan (which he has adopted in his ' List of North- 

 American Batrachians and Reptiles') of using symbols 

 attached to the binomial name, such as (A)_, (B), (C), (D). 

 Thus "(D) Ambly stoma tigrinmn" would mean the fourth 

 form of that Salamander. This symbol is prefixed, so as not 

 to stand in the way of the authority. 



90. Gould's 'Birds of Neiv Guinea.' 



[The Birds of New Guinea and the adjacent Papuan Ishinds, induding 

 any new Species that may be discovered in Australia. By [the late] John 

 Gould, F.R.S. &c. Part XIX. Folio. London : 188-5.] 



The nineteenth part of this work, with the letterpress by 

 IMr. R. B. Sharpe, contains figures of the following species : — 



Cacatua gymnopis. Ptilopus solomonensis. 



ducorpsi. Halcyon tristrami. 



Cyclopsitta occidentalis. Pachycephala fuscoflava. 



Pristorhamphus versteri. Zosterop-s brunneicauda. 



Urocharis longicauda. uropygialis. 



Glycychijera fallax. Myiagra fulviventris. 

 Carpophaga rubricera. 



It would have been better to have taken the second figure 

 in the plate of Ptilopus solomonensis from the female speci- 

 men — on which the sjDccies was first established — instead of 

 giving two figures of the male bird. 



91. Gould's ' Supjjlement to the Trochilidse.' 



[Supplement to the Trochilidae, or IIummiDg-Birds. By [the late] 

 John Gould, F.H.S. &c. Part IV. Folio. London : 1885.] 



The fourth part of the 'Supplement to the Trochilid?e' 

 contains an account of twenty-nine species not included in 

 the monograph, or concerning which further information was 

 required. The species figured are : — 



Campylopterus phainopeplus. Diphlogfena aurora. 



Diphlogfena hesperus. Oroopyra calolaema. 



