TABLE OF CONTENTS 
V 
X Notices on some Facts connected with the Publication of 
the successive Volumes of the “ Monographs of North 
American Diptera ”. 68 
1 On my Share in translating from the German, and in 
editing, the three Volumes of Loew’s “Monographs of 
North American Diptera ”. 68 
2 Ou the long Delay attending the Publication of the third 
Volume of “Monographs of North American Diptera” . 69 
3 The Smithsonian Conflagration in 1865 . 73 
XI Dr. Hermann August Hagen. 74 
An account of his woik on North American Neuroptera and Pseu- 
doneuroptera and of my contributions to it. A characterization of 
this excellent man. 
XII An Account of the Circumstances attending the Transfer of 
the Collection of North American Diptera accumulated 
in the Hands of Loew from Guben, his Residence, to the 
Museum in Cambridge, Mass.77 
The purpose and the final result of my twenty-one years’ co-opera¬ 
tion with Loew in working up the North American Diptera have 
been summarily told in my “ Introduction ” (p. 3 to 8). The present 
Chapter contains a detailed account of the last stage of the whole 
transaction: the transfer of the collection from Guben, Loew’s 
residence, to Cambridge, Mass. I conclude this account in the 
following terms : “ In presence of the tragedy of Loew’s decline 
and death . . . , we must not consider the detail, but the total result 
of his contributions to American dipterology, which consists of a 
very large amount of descriptive work, always thoroughly 
conscientious, and of the realization of the long-cherished 
ideal of a typical collection, which was delivered by Loew in a 
perfect condition. This was the same Loew who, according to 
his biographer, had made in his youth (and kept) the vow not to 
partake of any warm food, until he had paid off the debts con¬ 
tracted during the penurious years of his University studies.” 
XIII Special Report ou the Collection of North American Diptera, 
accumulated in Guben, and transferred in 1877 to the 
Museum in Cambridge, Mass.92 
1 How I received the Collection.92 
2 Miscellaneous Notes on the Localities of the Diptera in 
Loew’s and my Collections (now both in the Museum in 
Cambridge, Mass.), and on the Collectors who, besides 
myself, have contributed to them.94 
This “ Special Report ” is likewise alluded to in my “ Introduc¬ 
tion ” (p. 8 in the middle). It contains an account of the state in 
which I found the collection in Guben, and of what I have done 
in preparing it for its transfer to the United States; It provides 
