The Biology of the North American Crane 

 FHes (Tipulidce Diptera) 



CHARLES PAUL ALEXANDER, 

 ITHACA, N. Y.* 



IV. The Tribe Hexatomini. 



The tribe Hexatomini includes the four genera, Hexatoma, 

 Cladolipes, Eriocera and Penthoptera, representatives being found 

 in all portions of the temperate and torrid zones with the exception 

 of the Australasian region. The Nearctic genera will be considered 

 In the order given above. 



Hexatoma Latreille. 



This genus Includes a small number of forms with a Holarctic 

 distribution, there being thirteen European and one North Ameri- 

 can species as yet described. Our fragmentary knowledge of the 

 life-histories of members of this genus was indicated in a paper by 

 Mr. Lloyd and the author. (The genus Eriocera Macquart, 1914 

 Journal of Entomology and Zoology, vol. VI, 12.) 



Hexatoma megacera Osten Sacken. 



Hexatoma megacera Osten Sacken; Proc. Acad. Nat. Sci. Phlla., 

 242, 1859. 



This Is the only Nearctic species as yet discovered. It is found 

 throughout northeastern America, the distribution of the Insect so 

 far as known being as follows : 



Neiv York, Fulton Co., Sacandaga River, June 6-18, 1909; 

 Johnstown, May 24, 1909 (Alexander) ; Tompkins Co., Ithaca, 

 May 3-15, 1912 (Alexander). Co;/;;6^r//rz//, Litchfield Co., Chapin- 

 vllle, May 26, 1904 (Britton). Maryland, Osten Sacken's type; 

 Montgomery Co., Cabin John Bridge, April 28, 1912 (Malloch). 

 District of Columbia, Washington, early spring, Osten Sacken's 

 type. Virginia, Fairfax Co., Glencarlyn, May 1, 1910 (Knab). 



*Contribution from the Limnological Laboratory of the Department of Entomology 

 in Cornell University. 



