THE CANADIAN ENTOMOLOGIST. 15% 
he informs us, be the Third Volume of the Monographs of N. A. Diptera, 
written by Mr. H. Loew, of Meseritz, Prussia, and translated by the 
Baron. It will shortly be published by the Smithsonian Institution, 
uniform with the preceding volumes. Baron Osten Sacken, as our 
readers are no doubt well aware, is the great, if not the only, authority of 
American Diptera, and was always, during his long residence in the 
United States, most ready and willing to afford any information or assist- 
ance that was sought from him. We deeply deplore his removal from 
us, and trust that it will only be temporary after all. He bears with 
him our best thanks for his many kindnesses, and our hearty wishes for 
his continued welfare and prosperity, wherever he may be. 
Mr. C. V. Ritey.—We are desired to announce to our readers that 
Mr. Riley is making a special study of Galls, with the intention, before 
long, of publishing a full and illustrated paper upon the subject. He will 
be glad to receive the co-operation and assistance of all who can aid him 
in his investigations. It is in the power of every collector to do some- 
thing in this way, for no one can be much afield in quest of insects. 
without observing many specimens of these wonderful structures. Samples 
can be easily transmitted by mail to Mr. Riley at a very trifling expense- 
He expresses himself willing to assist others, as much as he is able, by 
exchanges, etc. He purposes henceforth making the Aadz/s of insects of 
all orders, and the study of Galls more particularly, his specialty. His 
address is C. V. RILey, office of the State Entmologist, cor. 5th & Olive 
streets, St. Louis, Mo. 
CramBip&.—Mr. W. Saunders (London, Ont.) is engaged in working: 
up the history of the various species of Crambide inhabiting Canada and 
the adjoining States. He will be thankful for any assistance that may be 
afforded him by loan of specimens, and information as to locality, time of 
appearance, etc. 
Hemiprera.—Mr. E. Baynes Reed (London, Ont.) is preparing a 
list of Canadian Hemiptera. As nothing has hitherto been done in this. 
order in Canada, the co-operation of all members of the Society is much. 
required in order that the catalogue may be rendered as complete as. 
possible. Specimens will be gratefully received by Mr. Reed, and 
returned when desired. 
Pror. Macoun.—This gentleman started about the middle of last 
month upon a five weeks’ collecting tour along the North Shore of Lake 
