Number 8o April 28, 1920 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan Published by the University 



A NEW GOMPHINE GENUS FROM BRITISH GUIANA 



WITH A NOTE ON THE CLASSIFICATION OF THE 



SUBFAMILY (ORDER ODONATA) 



By E, B. Williamson 



Desmogomphus, new genus 



Belonging to the legion Gomphoides of the Monographie dei 

 Gompkines and to the short-legged division of the legion. Sepa- 

 rated at once from the " genre Zonophora, " as defined in the Mono- 

 graphie, by the relatively short uncrossed triangle of the front wing 

 and the simpler venation (anal area of front wing only one cell wide) ; 

 and from the "genres Progomphus and Gomphoides" by the 

 shorter stigma (in the front wing less than one-third as long as the 

 distance from nodus to stigma), by the proximal angle of the sub- 

 triangle in the front wing distal to the arculus, and by the anal 

 crossing in the hind wing proximal to the subtriangle a distance 

 equal to the anterior side of the subtriangle. 



Dr. Calvert (Ent. News, XIV, June, 1903) describes and figures 

 the venation of a new species of Diaphlebia giving a careful an- 

 alysis of the venational characters of Diaphlebia and Epigomphus. 



