8 
WORK IN THE UNITED STATES 
refused to have anything to do with Diptera, although he might 
have been very useful to me by contributing specimens from South 
Carolina. 1 
As I said above, in 1871 I resigned my post of Consul General of 
Russia in New York, and remained a part of the following two years 
in Europe. In September, 1873, I returned to the United States, 
and spent the interval between this year and 1875 principally in 
working at the Diptera of the Museum of Comparative Zoology in 
Cambridge, Mass, (where I had deposited my collections during my 
absence), and in preparing materials for the projected new edition 
of my Catalogue of North American Diptera. Between Decem¬ 
ber, 1875, and September, 1876, I made a journey to California, the 
Sierra Nevada, and the Rocky Mountains, whence I brought back 
considerable collections. A portion of the collection of Californian 
Diptera was worked up by me in my Western Diptera, 53 (1877), 
after which publication I bade farewell (and this time for good) to 
the United States, and sailed in June for Europe. 
One of the first duties I had to fulfil, after my return to Europe, 
was to go to Guben, the residence of Loew, and to secure the ship¬ 
ment to the United States of the large collection of North American 
Diptera which, for the last twenty years, had been accumulating in 
his hands; an arduous and risky business for me to undertake, but 
one which was nevertheless successfully accomplished. The whole 
collection arrived safely at Boston (in the autumn of 1877), and, as 
I have related above, was deposited in the Museum in Cambridge, 
Mass. With this transfer, and the almost simultaneous publication 
of the secoyid edition of my Catalogue of North American Diptera 
(1878), the principal object of my entomological labor in the 
United States was fulfilled. An outline of the transactions which 
have led to these results has been given by me in this “ Introduc¬ 
tion”; a detailed account will be found in this “Record,” Part II, 
Chapter XII. 
The two men who principally influenced the American period 
of my entomological career were Loew , and S. F. Baird of the 
1 In Loew’s “ Centuries ” some species are marked : Carolina (Zimmermann). The 
specimens must have been found by Loew in other collections and not among the ma¬ 
terials which he received from me. 
