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 Avish 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 Americce septen- 

 trio7ialis 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: 



1 Proceedings of The Academy of Natural Sciences of Philadelphia, 

 October, 1914, pp. 579-606. 



