6 University of Michigan 



through the trees, a regular performance, as I attempted to 

 approach, and at the same moment our mozo hissed and point- 

 ed to the bushes at my elbow. There, so close I had to move 

 back a step to strike at it, resting on a flat leaf about five feet 

 above the water, was this beautiful bright green and rich 

 brown Erpetogomphus. The next day, when he had one of the 

 elusive Gomphoides in his net, an Erpetogomphus alighted in 

 the characteristic position near J. W., but flew before he could 

 strike at it. We saw no other specimens of the genus in 

 Colombia. 



Remarks: In Dr. Calvert's discussion of tristani, so fre- 

 quently referred to above, he points out that Costa Rica marks 

 the southern range of the genus Erpetogomphus as then 

 known. However, only two species are recorded from Costa 

 Rica and there is an absence of records in the large area in- 

 tervening between Costa Rica and Guatemala, the latter coun- 

 try being in 1905 the southern known range of the genus. 

 The discovery of this new species six hundred miles or more 

 up the Alagdalena River in Colombia is a wide extension of 

 the known range of the genus ; and the close relationship of 

 the Costa Rican and Colombian species calls attention again 

 to the South American affinities of the Costa Rican fauna. 



Ischnogomphus, new genus 

 Description : Slender, dull colored, belonging to the legion 

 Gomphus of de Selys, and to that small group of genera in the 

 legion in which the cross-veins between AIi.s and I\I^ are num- 

 erous and unspecialized. Its closest ally is Cyanogomphus" 

 from which it is separated by the anal area of the front wings 

 being one cell wide, instead of two or more, and by the ab- 

 sence of an anal triangle in the male. 



"Williamson, E. B. Entomological News, Vol. XXVII, April, 1916, plates 

 VIII and IX, pp. 167-172. 



