394 liuyal Institution of Great Britain. 



of the genus Nycteribia, comprising the following, the characters of 

 which are given in the * Proceedings ' : 



Nyct. Sykesii. Long. corp. lin. 2^. Species maxima. 



Nyct. Hopei. Long. corp. lin. '2. — Prsecedenti vald^ affinis, at 

 minor. An illius mas ? 



Nyct. dubia. Nyct. Blainvillii, Latr. 



Nyct. Blainvillii, Leach. 



Nyct. Roylii. 



Nyct. Dufourii. Nyct. Vespertilionis, Dufour. 



Nyct. pedicular ia, Latr. 



Nyct. vexata. Nyct. Vespertilionis, Herm. Hab. in Vespertilione 

 murino Europae. The insect described by Hermann under the name 

 of Nyct. Vespertilionis may be considered, without hesitation, as spe- 

 cifically distinct from our two British species, as well as from Nyct. 

 Dufourii, in the structure of the male. It may possibly, however, 

 be identical with Nyct. pedicularia. 



Nyct. Jenynsii. 



Nyct. Latreillii, Leach. Hab. in Vespertilione murino Angliae. 



Nyct. biarticulata. Phthiridium biarticulatum, Herm. Phthiri- 



dium Hermanni; Leach. Celeripes Vespertilionis, Mont, in Linn. 



Trans., vol. ix. p. 1 66. Nycteribia Vespertilionis, Mont, in Linn. 



Trans., vol. ix, t. S.f.5 $ . Hab. in Rhinolopho Ferro-equino 



Angliae, Germanise, Italise. — In Muss. Brit, et Dom. Stephens. — 



Obs. Species distinctissima, sectionem peculiarem in genere 



constituens. 



Hermann's trivial name for this species has been restored, as well 



in justice to that author as with the view of obviating the confusion 



which has arisen from his chief description having been derived from 



a different species. 



Mr. Westwood's Memoir was illustrated by numerous magnified 

 figures of the different species and of the details of their external 

 structure,* 



FKIDAY-EVENING PROCEEDINGS AT THE ROYAL INSTITUTION 

 OF GREAT BRITAIN. 



January 23. — Mr. Faraday on Melloni's recent discoveries in the 

 science of radiant heat. 



' January 30. — Dr. Ritchie : a comparative view of the Newtonian 

 and undulatory theories of light. 



February 6. — Mr. Faraday on the induction of electric currents. 



February 13. — Mr. Landseer on a sculptured historical monument 

 lately brought from Phoenicia. 



February 20. — Dr. Grant on the development of the respiratory 

 system in the animal kingdom. 



February 27. — Mr. Brande on the manufacture of floor-cloth. 



March 6. — Mr. Howsking on the construction and effect of the Ply- 

 mouth Breakwater. 



March 13. — Mr. Davidson on the ancient and modern state of 

 Jerusalem. 



• Mr. Westwood's Memoir has since appeared in the Transactions of 

 the Zoological Society. 



