384 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Society, Mr. C. W. Johnson of the Boston Society of Natural 
History, Mr. Samuel Henshaw of the Museum of Comparative 
Zoology, Harvard University, Mr. C. S. Ball, assistant in the 
Peabocly Museum, Yale University, for facilitating my work at 
their respective museums; Abbe V. A. Huard, Curator of the 
Museum of Public Instruction, Quebec, Canada, for information 
in regard to the Provancher types; and last, but certainly not 
least, Mr. S. A. llohwer, of the United States National Museum, 
for his readiness to cooperate, by I'urnishing information, or other- 
wise, in making this paper more nearlj^ accurate and complete. 
It was the intention of the writer at first to study the entire 
genus, but pressure of other work and lack of material soon 
compelled him to abandon this and to limit himself to the species 
within the restricted geographical area of New England. Another 
untoward condition was found in the non-existence or loss of a 
number of the types. However, through Professor Fernald's 
and his own efforts, the writer did succeed in bringing together 
sufficient New England material to allow him to draw fairly 
satisfactory conclusions in regard to most of the species found 
within that area, so far, of course, as external characters gave 
means to do so. 
A few forms, isolated specimens, found in Doctor MacGilli- 
vray's collection are not included in this paper out of respect to 
the wishes of Doctor MacGillivray. 
Collections and Workers. 
The most valuable collections of the North American species 
of this genus, from the standpoint of the types contained, are 
those of the American Entomological Society, Doctor A. D. 
MacGillivray, United States National Museum, of Harris in the 
Boston Society of Natural History, and of the Museum of Com- 
parative Zoology, Harvard University, in our own country; that 
of Provancher in the Museum of Public Instruction, Quebec, and 
of W. H. Harrington, Ottawa, Ontario, in Canada; and that of 
the British Museum in Europe. The types in the last three 
collections are, as far as I know, exclusively of species described 
from Canada. The collections of the American Entomological 
Society, Doctor MacGillivray, and Harris contain practically all 
of the types of the species thus far described from New England. 
