133 



illustrious De Haan, and to record the election of Professor Pictet, of 

 Geneva, in his stead. We have also lost a corresponding member, 

 Sir T. L. Mitchell. 



The following brief memoir of De Haan may not be unac- 

 ceptable : — 



William De Haan died at FJaarlem on the loth of April, 1855, 

 aged fifty-four years. For many years he had been charged with the 

 Curatorship of the Museum at Leyden, which is especially rich in its 

 entomological treasures. His works are not numerous, but embrace 

 a variety of subjects, all of them treated in a manner which displays 

 at once his classical knowledge, and the extent and depth of his 

 zoological studies : the principal of these are enumerated below. 



' Memoires sur les Metamorphoses des Coleopteres,' published in 

 the ' Nouvelles Annales du Museum d'Histoire Naturelle,' 4to, 

 Tome iv., ]836. This was intended as the first of a series of me- 

 moirs on the transformations of Coleoptera : it comprises the Lamel- 

 licorns, and is illustrated with ten beautiful plates. 



' Fauna Japonica — Crustacea elaborata. W. De Haan. Folio : 

 1835 — 49.' This splendid volume forms part of Siebold's great work 

 on Japan, published by the Dutch Government. It contains more 

 than seventy plates, the species being all represented of the natural 

 size, and the elementary plates being filled with the most elaborate 

 dissections. The Introduction relates to Crustacea generally, the 

 descriptions only to the orders Decapoda and Stomapoda. 



* Bijdragen tot de Kennis der Papilionidae : ' folio : 1840. With 

 nine plates. This is a portion of the great work published by the 

 Dutch Government, on the Natural Productions of its Eastern Pos- 

 sessions, and is confined to the restricted family Papilionidoe, of which 

 a great number of new species are described and excellently figured. 

 The differences of form in the larva, and of the wing-rays and geni- 

 talia in the imago, are most carefully figured and described, and are 

 availed of in the classification of the species. 



'Bijdragen tot de Kennis der Orthoptera:' folio: 1842. With 

 twenty-three plates. This is another portion of the same work, and 

 describes the whole of the Orthopterous insects. The general ob- 

 servations and the tables comprise all the known genera : the plates 

 are equally beautiful with those already noticed, and it may be said 

 that the whole of the plates illustrating De Haan's laboius are 

 amongst the most correct, perfect and elegant of any that have been 

 published in the Science of Entomology. 



