Number 52 April 17, 191 8 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, ^Michigan Published by the University 



RESULTS OF THE UNIVERSITY OF MICHIGAN- 

 WILLIAMSON EXPEDITION TO COLOMBIA, 

 1916-1917 



I. Two Interesting New Colombian Gompiiixes 

 (Odonata) 



Ly E. B. Williamson 



The genus and species described in this paper were taken 

 in Colombia in 1917. A detailed account of the expedition 

 and a description of the region in which the collections were 

 made have been given in a previous paper. ^ 



Erpetogomphus sabaleticus, new species 

 Description : Abdomen, male 33 mm., female 32 mm. ; 



hind wing, male 26 mm., female 28.5 mm. 



jVIale. — Head exactly like tristani, as described by Calvert,- 



except that the hind margin of the occiput, in the median line, 



has a short shallow rounded depression. 



1 A Collecting Trip to Colombia, South America, Miscellaneous Publications, 

 Museum of Zoology, University of Michigan, No. 3, February, 1918. 



2 Entomological News, Vol. XXIII, July, 1912, plate XVII, pp. 289-295. 



