1863.] 
53 
# 
It is evident that the value and usefulness of these publications depends in 
a great measure on the amount of material on which they are based and it is 
highly desirable that the abundance of such material should, as far as possible, 
insure the completeness of the monographs and hence, their more lasting value. 
I therefore beg to appeal to the friends of Entomology in Horth America, re¬ 
questing thepa to direct their attention, during the coming summer, to the order 
of Diptera in general and to the above named families in particular. All col¬ 
lections of diptera sent to me either directly (see my address below) or through 
the Smithsonian Institute, will he made useful for the increase of the know¬ 
ledge of the North American dipterological fauna and due credit will invaria¬ 
bly be given to the discoverers of new species. 
The wishes of the collectors respecting the naming of specimens or exchang¬ 
es, will be, as far as possible, complied with. 
R. OSTEN SACKEN. 
New York, May 7th, 1863. 
My address is:— 
Baron Osten Sacken, 
Care of MM. Schepeler & Co., 
52 Exchange Place, 
New York.” 
UNFINISHED BUSINESS. 
Mr. Knight’s motion, made at the last meeting, to ^'^add a Commit¬ 
tee on Insect Architecture to Art. 1 of Chap. 6 of the By-Laws,’’ was 
taken up and unanimously adopted. 
NEW BUSINESS. 
On motion, the thanks of the Society were unanimously tendered to 
Mrs. Lucy W. Say, of Newburgh, N. Y., and to Brackenridge Clemens, 
M. D., of Easton, Pa., for the valuable donations to the Library made 
by them this evening. 
ELECTION. 
On ballot, the following members were elected to serve as a ‘‘ Com¬ 
mittee on Insect Architecture ” until the next annual election:— 
J. Frank Knight, 
Charles A. Blake, 
Samuel Lewis, M. D. 
