418 Zoological Society : — 



into a number of separate spots, and the animal has very long taper- 

 ing gills, prolonged far into the branchial siphon. 



9. Panop^a middendorffii, a. x\dams, Zool. Proc. for 1854, 

 p. 137. Arctic Seas. (Haslar Museum.) Appears to be a variety 

 of P. nerve ffica. 



The Geographical Distribution of the genus Panopcea aifords an 

 illustration of the rule, or " law,*' so earnestly investigated by the 

 late Prof. E. Forbes, — that the range oi genera y as well as of species^ 

 depends in great measure on their geological antiquity ; and that 

 when the members of a group are scattered over the greater part of 

 the world, we may expect to find evidence of their existence in the 

 intervening spaces during a former age. M. d'Orbigny describes 

 139 extinct species oi Panopcea, commencing in the Permian age, 

 and occurring in every part of the world where secondary or tertiary 

 strata have been found. 



December 11, I855.--Dr. Gray, F.R.S., in the Chair. 



Characters of Two New Species of Tanagers. 

 By Philip Lutley Sclater, M.A. 



1. DuBUSIA AURICRISSA. 



Bubusia cyanocephalal Sclater, P. Z. S. 1855, p. 157. 



D. supra Jlavescenti-oUvaceo-viridis : capite nuchaque cceruleis : 

 loris nigris : subtus ccerulescenti-cinerea : tectricibus subalari- 

 bu8 et ventre imo crissaque cum tibiis vivide aureo-Jlavis. 



Long, tota 6*5, alse 3*6, caudae 3*0. 



Hab. in Nova Grenada, Bogota. 



Obs. Species 2>. cyanocephalce simillima, sed rostro minore, colore 

 dorsi flavescentiore olivaceo, capitis cseruleo magis extenso, ventre 

 ceerulescenti- neque albescenti-cinereo, et tectricibus subalaribus nec- 

 non ventre imo crissoque cum tibiis vivide aureo-flavis. 



Since compiling the list of Bogota birds, in which I have included 

 this species under the name Dubusia cyanocephala ?, I have examined 

 D'Orbigny' s types of that bird in the Paris Museum, and find them 

 so different from the present as to lead me to conclude that they are 

 specifically distinct. 



The present bird — which must be considered as the representative 

 of D. cyanocephala in the mountain ranges of New Grenada — is com- 

 mon in collections from Bogota. The British Museum contains ex- 

 amples of both the species. Those of D. cyanocephala were procured 

 by Mr. Bridges in Bolivia. 



2. Iridornis porphyrocephala. 



Tanagra analis, Tschudi in Mus. Berolinensi. 



I, supra purpurea, dorso imo et marginibus alarum et caudce virides- 

 centibus : fronte, loris, mento summo et regione auriculari nigris : 

 gutture late et Icete aureo-Jlavo : pectore summo purpurascente : 

 ventre viridescente, medialiter rufescenti-ochraceo : ano intense 



