TABLE OF CONTENTS 
Vll 
upon Loew during the eight years (1860-1868) when they were 
colleagues in the Gymnasium at Meseritz, an account princi¬ 
pally based on extracts from Loew’s letters to me. 
XVIII Notice of Johann Wilhelm Zetterstedt (1785-1874) . . 142 
Among the many services rendered to dipterology by Zeller, 
a special mention must be made of the faithful assistance he 
afforded to Zetterstedt during his long and persevering career, 
culminating in the publication of fourteen volumes on Scandina¬ 
vian dipterology. The dedication which Zetterstedt placed at 
the head of the first volume of this work was a well-deserved 
compliment to Zeller: “ Zellero, inter Lepidopterologos et Dip- 
terologos Europae magni, spectati et cari nominis viro ! ” 
Loew had always treated Zetterstedt with studied disregard, 
and had declined all correspondence with him. Zetterstedt 
gave a proof of his magnanimity when in 1860, at the age of 
seventy-five, as if in forgiveness of the past, he dedicated his 
fourteenth and last volume to Loew, in the following terms : 
“ Viro amplissimo, Doctori H. Loew, etc. Dipterologo nostri 
aevi celeberrimo, liunc sui operis tomum dicavit J. W. 
Zetterstedt.” 
XIX Camillo Rondani and his Relations with Loew .... 144 
This Chapter is based on my own impressions during my 
meeting with Rondani in Parma (in 1873), on the materials I 
gathered in the existing literature, on my correspondence with 
Loew, and on three letters of Rondani to Loew, written in 1846, 
which opened their correspondence, and which were found 
among Loew’s papers. This Chapter offers a new instance of 
the “sans fagons” manner of Loew in his relations with his 
dipterological colleagues. At the same time it shows that 
Rondani, as early as 1845, had called attention to the differ¬ 
ence between macrochaetae and ordinary bristles, and had in¬ 
troduced this new term for them. Although, in his later 
publications, he did not give any further development to this 
suggestion, it became the germ of the method of Chaetotaxy 
which plays at present such an important role in dipterology. 
Loew, to whom Rondani had sent his paper of 1845, did not 
appreciate its contents, and began two years later the publica¬ 
tion of his “European Asilidae” (1847-1849) without making 
any use of the cliaetotactic characters which, nevertheless, are 
indispensable for the proper classification of this family. 
XX Notes on Chaetotaxy, complementary to my previous 
Publications on the same Subject. 153 
These notes contain an account of the origin and progress of 
Chaetotaxy, and a proposal for its improvement. 
XXI An Account of the Breach between Loew and Scliiner . 158 
As the estrangement between these two leading dipterologists 
has had some importance in the history of dipterology, I have 
