WORK IN THE UNITED STATES 
7 
for merely descriptive work, and submitted to it (a mom corps de¬ 
fendant) only when it was unavoidable. Thus, in consequence 
of my agreement with Loew, I could hope to obtain excellent de¬ 
scriptions of the collections brought together by me, and, at the 
same time, pursue my own favorite studies independently. For 
the latter, I had reserved for myself the Tipulidae brevipalpi , and 
later, the Tabanidae. Both families have been treated monograph¬ 
ic ally by me. 
Besides my principal works (my two Catalogues , the papers on 
Tipulidae , Tabanidae , Cecidomyiidae , Cynipidae , the Western Dip- 
tera, and the translating and editing of the three volumes of 
Loew’s Monographs) I wrote, during my residence in the United 
States, a considerable number of papers on other entomological 
subjects. All these are enumerated in my “ List.” 
I also attempted to be useful in corresponding with American 
entomologists, and in naming Diptera for them. As a memento of 
this correspondence, I have before me GIT letters received from 99 
American correspondents between 1856 and 1872. 
It would, have been a grateful task to me, and an interesting contribution to the 
history of the development of entomological studies in the United States and 
Canada, to prepare an account of this correspondence and to recall the names of 
many worthy observers of nature (often unknown to fame) who took part in it. 
Such an account would have been foreign to the immediate purpose of the present 
publication, aud would have occupied too much space in it, but circumstances per¬ 
mitting, I may, some day, devote a separate publication to it. [This was written 
before 1898 ; since then my “circumstances” have made it impossible to realize 
this project.] 
During the winter of 1857-1858 I visited Cuba (where I spent 
five weeks) and returned by way of New Orleans, Montgomery, Ala., 
Savannah, and Florida. Although the season was not the best for 
collecting, I brought many specimens home, especially from Florida. 
In Havana I made the acquaintance of the excellent Prof. Felipe 
.Poey , who at that time already looked old, though he lived for 
thirty-five years longer. It must have been on my way home to 
Washington that I paid a visit in Columbia, S. C. (the exact date I 
do not remember), to Christoph Zimmermann , a German coleopter- 
ist, whose name may be found in Ilagen’s Bibliotheca as author of 
papers on Zabrus , Aniara, etc. (1830-1832). lie most positively 
