458 PROCEEDINGS OF THE ACADEMY OF [Sept., 
new or little-known crane-flies from the united states and 
canada: tipulid^, diptera. part 2. 
by charles p. alexander. 
Introduction. 
In the present paper, the author has undertaken a consideration 
of the American crane-flies contained in the collections of the Boston 
Society of Natural History and the Museum of Comparative Zoology 
at Cambridge. These collections are of peculiar interest to the 
student of crane-flies since they include the numerous types of 
Johnson, Osten Sacken, and Loew, in addition to a considerable 
amount of unclassified material. The paper has been divided into 
two parts, the first being a designation of the single-type specimen 
of the species of Tipula described by Loew, the second part a con- 
tinuation of the first paper under this title. ^ I wish to express my 
deep appreciation to all of the persons who have kindly assisted me 
in this study, most of whom are designated in various parts of the 
paper. I am especially indebted to Mr. Charles W. Johnson and 
to Mr. Samuel Henshaw for the great privilege of examining and 
studying the invaluable collections in their custody. 
Part 1. Designation of the Single-type (Lectotypic) Specimen 
OF the North American Species of Tipula described 
BY Hermann Loew. 
The North American crane-flies described by Hermann Loew 
were included in a series of papers published between the years 
1861 and 1872 under the general title of Diptera Americoe septen- 
trionalis indigence and appearing in the Berliner Entomologische 
Zeitschrift. This remarkable series of articles was in ten parts or 
centuries, each containing the description of a hundred species of 
flies. The references will be merely to the "Century," with the 
number of the species in the century and the original pagination. 
The date of the five centuries in which the crane-flies were described 
is as follows: 
' Proceedings of The Academy of Natural Sciences of Philadelphia, 
October, 1914, pp. 579-606. 
