142 
NOTICE OF JOHANN WILHELM ZETTERSTEDT 
tion of Loew, stimulated by the appearance of Zeller’s excellent 
paper on Diptera in an earlier number of the same volume of 
Isis. 
XVIII NOTICE OF JOHANN WILHELM ZETTERSTEDT (1785-1874) 
Among the services rendered by Zeller to science, I must men¬ 
tion his relations with Zetterstedt. He made himself very 
useful to him by his communications, and Zetterstedt showed him¬ 
self very grateful. The first volume (of the fourteen of the 
“ Diptera Scandinaviae ”) opens with the following dedication : — 
Zellero, inter Lepidopterologos et Dipterologos 
Europae magni, spectati et cari nominis viro. 
These words are printed in the middle of the page, in large 
type; and at the very bottom of the page, in small type, is added: 
O p e r i s auctor. 
In the Preface, p. xi, there is the following passage: “ Insecta 
numerosa, quae Dr. Zeller, acutissimus et egregius Silesiae Lepi- 
dopterologus pariter ac Dipterologus liberalitate admiranda quotan- 
nis e Glogavia mihi largitus est, eo majoris pretii et acceptiora 
habeantur, quo non solum typica sunt descriptionis clar. Auctoris, 
verum etiam in individuis optime conservatis data et observationi- 
bus plenis ac confidentibus allegata fuerunt.” 
Observe the words in individuis optime conservatis. The 
habit of handling Microlepidoptera had accustomed Zeller to the 
most careful treatment of specimens. The “ setting up ” of his 
Diptera is perfect. At the same time he was a wonderfully active 
collector and used to bring home numberless specimens. In this 
respect he may be compared to the Swiss Jacob Boll and the 
American Morrison; but these were professional collectors. 
Loew seems to have had no relations whatever with Zetterstedt. 
In his Vol. XII (1885), Zetterstedt gives a list of thirty-eight 
entomologists who had corresponded and exchanged specimens 
with him. Loew is not among them. Volume after volume of 
“ Diptera Scandinaviae ” were dedicated to entomological celebrities : 
Wahlberg, Stager, Boheman, Dahlbom, Stenhammar, Bonsdorff, 
Macquart (1852), and it is only in the last volume (Vol. 
