18/6.] NEOTROPICAL ANATID.E. 407 



ducto et linea utrinque ah oculis ad collum imum descendente 

 nigris ; alis extus ceerulescenti-schistaceis ; tectricibus et secun- 

 dariis a/bo anguste terminatis, speculo atari aeneo-viridi ; dorso 

 postico cinereo, uropygio fasciolis minutis albis variegato ; 

 subtus rufescenti-ochracea, lineis ?iigris ornata ; mento, linea 

 ad rostri basin, spatio suboculari cum gutture conjuncto et pec- 

 tore superiore utraque ex parte nigerrimis ; rostrojiavo, pedibus 

 rubellis : long, tota \ivb, alee 7, caudce 4 - 5, rostri a rictu 1*6, 

 tarsi 1*9. Fern, supra ardesiaca, dorsi plumis nigro flammu- 

 latis ; collo et uropygio lineis albis nigrisque vermiculatis ; 

 subtus omnino castanea. 

 Hub. Rivers of the Chilian Ancles {Bridges, Gay). 

 We are indebted to the researches of Mr. Bridges among the Chi- 

 lian Andes for the discovery of this curious form. He sent home 

 specimens of the present species in 1841, which were described by 

 Mr. Gould before this Society in November of that year. Mr. Bridges 

 remarks that it swims and dives against the flow of the Chilian 

 mountain-torrents with a rapidity truly astonishing. 



2. Merganetta turneri. 



Merganetta turneri, Scl. & Salv. P. Z. S. 1869, p. 600 (Peru), 

 Ex. Orn. p. 199, t. 100, et Nomencl. p. 131. 



Merganetta leucogenys, Scl. & Salv. (nee Tsch.) P. Z. S. 1869, 

 p. 157. 



Supra nigra, interscapulio et scapidarihus rufo marginatis ; capite 

 colloque toto albis, linea rostrum cingente, pileo medio in strigam 

 nuchalem producto et linea utrinque ad imum collum descendente 

 nigerrimis ; alis extus ccerulescenti-cinereis ; spieculo alari ceneo- 

 viridi ; tectricibus alarum et secundariis albo anguste termi- 

 natis ; abdomine nigro, ventre medio fusco variegato ; crisso et 

 uropygio nigris, albo minute vermiculatis; cauda fuscescenti- 

 cinerea unicolori ; tectricibus subalaribus cinereis ; rostro et 

 pedibus obscure rubris : long, tota 16"0, alee 7'5, caudce 5*0, 

 rostri a rictu 1*5, tarsi 18, digiti medii cum ungue 2*3. 

 Fern, supra cinerea, lateribus cervicis et uropygio albo nigroque 

 minute vermiculatis; dorso nigro jiammulato ; alis albo bifas- 

 ciatis ; speculo alari obscure ceneo-viridi ; subtus fulvoruf a 

 unicolor : long, tota 16 - 0, alee 6 4, caudce 4"0, rostri a rictu 1'35. 

 Hab. S. Peru; Rivers of the Cuzcan Andes (Whitely). 

 When we first received examples of this bird from Mr. H. Whitely 

 we referred it to the species described by Tschudi as Merganetta 

 leucogenys. Having, however, made a reinvestigation of the group, 

 we convinced ourselves that Tschudi's bird is, so far as can be de- 

 cided by his figure and description, inseparable from the Merganetta 

 colurnbiana of New Granada, and that the present species must be 

 regarded as undescribed, being ecpially distiuct from the New-Gra- 

 nadan form, and from the Chilian Merganetta armata. From the 

 former it differs in its larger size, and black breast and flanks, which 

 are only relieved by some brownish marks in the middle of the belly. 

 In the New-Granadan bird, which is well represented in Des Murs's 



