228 Zoological Society. 



and terminating in a sharp point. The carapace is of a whitish green 

 colour and covered all round the edges ■nith rough coarse hairs. The 

 valves are convex on the centre and have their surface dotted all over 

 with small dots or punctures. The antennae and legs are apparently 

 very short, and the setee of both are shortly plumose. 



This is the largest species of the genus I have yet met with, being 

 about ^th of an inch in length. Mr. James, in his account of the 

 Expedition to the Rocky Mountains, mentions his finding a Cypris 

 along with the Apus obtusus rather more than one-fifth of an inch 

 in length. 



2. On the Genus Thalxjrania. By John Gould, F.R.S. 



It is now some years since I proposed the generic name of Thalu- 

 rania for the Trochilus furcatus and its near allies. This generic 

 term having been adopted by the Prince of Canino and others, tends 

 to show that the division is a good one, and hence a list of the spe- 

 cies known up to the present time, with their native habitats, may 

 not be uninteresting to the members at the present meeting. I would 

 also take the present opportvmity of laying before the Society a new 

 and very beautiful species, which, as far as I am aware, is only to be 

 seen in my own collection. 



The species of this well-defined genus are — 



Thalurania furcata. 



Hab. Cayenne, Demerara, and Brazil. 



Thal. nigrofasciata. 



Hab. Woods on the banks of the Upper Amazon. 



Thal. Columbiana. 



Hab. Temperate region in the neighbourhood of Bogota in Co- 

 lumbia. 



Thal. venusta. 



Inhabits Costa Rica and the southern portion of Mexico. The 

 only species of the genus yet discovered to the north of Panama. 



Thal. viridipectus. 



A beautiful species lately sent to Europe from the Caraccas near 

 to the Andes. 



Thal. verticeps. 



A species found only in my own collection. It frequents the 

 wooded regions on the west side of Pichincha in Ecuador. Sent to 

 me by Mr. Jameson. 



Thal. glaucopis. 



Hab. South Brazil. 



Thal. "Watertoni. 



This is the largest species of the genus and a very beautiful bird. 



Hab. Demerara. 



