Number 68 April 24, 1919 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan Published by the University 



RESULTS OF THE UNIVERSITY OF AIICHIGAN- 

 WILLIAMSON EXPEDITION TO COLO^IBIA, 



1916-1917 



IV. Notes on Species of the Genus Heteragrion Selvs 

 with Descriptions of New Species (Odoxata)^ 



By E. B. Williamson 



In order to identify specimens of Heteragrion in my collec- 

 tion taken by B. J. Rainey, L. A. Williamson and myself in 

 British Guiana, and by Jesse H. Williamson and myself in 

 Colombia, it was necessary to study carefully the species hith- 

 erto described. The results of this study are embodied in the 

 following paper. 



Heteragrions are not common in collections and the total 

 number of specimens is not large. Yet this material has shown 

 the existence of a relatively large number of species, twenty- 

 two having been named. The larger number of species were 

 described from material in the collections of de Selys and 



1 1, Dec. Papers Mus. of Zool., Univ. of Mich., No. 52, April 17, 1918. II, 

 ibid.. No. 59, June 24. 1918. Ill, ibid., No. 63, January 5, 1919. 



