TRANSFER OF LOEW’S COLLECTION TO CAMBRIDGE 
79 
shall be remunerated for the labor he has bestowed upon it. 1 It must 
be borne in mind at the same time that, besides what he received from me, 
Loew has considerably added to this collection from other sources (for 
instance, by purchases from Mr. Belfrage), so that a portion of it is his 
property. Thus the sum paid to him will also cover the purchase of the 
specimens of the latter description. The collection contains: — 
1. The original types of all the North American 
species described by Loew (the total number being 
1350-13G0), say. 1300 species. 
2. Species described by former authors and satis¬ 
factorily identified by Loew, at least. 330 species. 
3. Undescribed and unidentified species (according 
to Loew’s estimation). 1200-1300 species. 
Total. 2800-2900 species. 
You are aware that the portion of my own dipterological collection which 
remained in my hands in the United States is deposited now by me (with 
your leave) in the Cambridge Museum. It is of course smaller than the 
other as to the number of species. It contains : — 
1. Numbered duplicates of a considerable number of species repre¬ 
sented in most cases by ■well-preserved specimens, in addition to the 
typical ones of the other collection, that may in some cases have become 
defective in consequence of travel and handling. 
2. The types of my descriptions, especially in the family Tipulidae. 
3. The entire collection of the family Tabanidae, which I intend to work 
up at some future time. 
N. B. This was written in 1872. Since then, besides the Tabanidae , many 
other typieal specimens of my descriptions have been added to the collection : those 
of my “Western Diptera,” of my paper on Syrphus s. str., etc. 
4. A large number of undetermined species, not contained in the other 
collection, especially in the families which have not been worked up (Ma- 
scidae , Culicidae, Chironomidae, etc.). 
Both collections united must contain about 1800 determined species 
(about 1450 of which are original types) and certainly beyond 1600 
undetermined species ; and thus they represent very nearly the actual con¬ 
dition of our knowledge of North American Diptera. 
Now, as soon as the former collection becomes the property of the 
Museum, I will formally renounce in favor of the same Museum my right 
1 Loew had received from the Smithsonian Institution a pecuniary compensation 
for the manuscripts of the three volumes of the “Monographs.” But, of course, this 
compensation covered that part of his work only, and not his other publications 
(“ Centuries,” etc.), nor the additions made by himself to the collection. 
