99 



piui is identical with rufipennis, which is founded upon Gyllenhal's description. If 

 I am right, the synonymy will stand thus : — 



" Acalyptus Carpini, Hbst., Gyll., Sch. 

 " Ellescus sericea, Dahl., Dej. 

 " Sibynia sericea, Sturm, (Ins. Cat.) 



" Acalyptus rufipennis, Sch'un. 

 " According to Gyllenhal, it occurs plentifully in Sweden upon the flowers of Salix 

 cinerea." 



Mr. Saunders alluded to the great abundance of cockchafers this year, and stated 

 that he had made experiments on the relative weight of males and females. He found 

 that in twelve males the average weight was 13^ grains each, in twelve females 20^ 

 grains. 



The heaviest male weighed 17 grains, the lightest 12 grains. 



The heaviest female weighed 24^ grains, the lightest 16 grains. 



The difference between the heaviest male and female was 7£ grains. 



The difference between the lightest male and female was 4 grains. 



The difference between the lightest male and heaviest female was 1 2\ grains, the 

 heaviest male being 1 grain heavier than the lightest female, 



The President said that these observations might possibly prove to be more than 

 curious, and to have an economic value ; for in some places on the continent, in sea- 

 sons when cockchafers were abundant, quantities had been collected and pressed for 

 the sake of the oil they afforded ; and in Transylvania they had been made into a paste 

 with which cart-wheels &c. had been greased. 



August 4, 1851. 

 J. O. Westwood, Esq., President, in the chair. 



Herr Herrich-Schaeffer and Count Mniszeck were present as visitors. 



The following donations were announced, and thanks ordered to be given to the 

 donors thereof: — 'The Zoologist ' for August ; by the Editor. ' Entomologische Zei- 

 tung' for June ; by the Entomological Society of Stettin. ' Isis, 1848, Heft xi.' ; by 

 Herr Koch. Lieut. Maury's ' Investigations of the Winds and Currents of the Sea,' 

 (from the Appendix to the 'Washington Astronomical Observations for 1846'), with a 

 map: Washington, 1851; by the Author. ' Monographia Cassididarum,' torn, i., 

 auctore C. H. Boheman; by the Author. 'Verslag van de Zesde Algemeene Verda- 

 gering der Nederlansche Entomologische Vereeniging ; ' by the Netherlands Entomo- 

 logical Society. ' Transactions of the Microscopical Society,' vol.iii.parts 1 and 2 ; by 

 the Society. 'Additamenta ad Faunam Carcinocologicam Africa Occidentalis, scrip- 

 sit J. A. Herklots ;' by the Author. A box of Brazilian Hemiptera ; by M. de Gand. 

 Specimens of Apamea ophiogramma and Gelechia velocella ; by Mr. F. Grant. Two 

 living specimens of Chrysomela cerealis from Llanberris ; by Mr. Foxcroft. A nest 

 of the spider, Theridiou variegatum (T. callens, Blackivell) ; by Mr. Meade. 



Mr. J. F. Stephens exhibited a series of varieties of Abraxas Grossulariata, caught 



