NO. 1389. DRAGONFLIES OF BURMA AND SIAM— WILLIAMSON. 



179 



most usual. The triangular dorsal area of males is red or blue, or 

 both colors in the same individual. This red and blue are verj- deli- 

 cate, comparable almost to the reflections of the vitreous areas of 

 the wings. 



Fig. 11.— Wings of m.\le rhinocyph.\ fenestrei.la from Pek.\k. 



7. RHINOCYPHA BIFORATA De Selys. 



Material studied: Siam, collection U.S.N.M., Khow Sal Dow Moun- 

 tain, 1,000 feet, Trong, Lower Siam, Januarv-Februarv, 1899, 5 



Fig. 12.— Wings of male rhinocypha biforata from Siam, 



males, 2 females. Burma, collection Williamson; a very teneral male 

 \ seems to belong here. 



8. RHINOCYPHA IGNIPENNIS De Selys. 



Material studied: Burma, collection Williamson, 1 male. 



This single specimen", with the male of qnadriiiiacxtJatd described 

 above, was sent to Professor Forster. M}" opinion was that it repre- 

 sented an undescribed species closely related to ignipennis. Profes- 



