THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[SIXTH SERIES.] 



No. 102. JUNE 1896. 



LX. — On some Odonata of the Subfamily iEschnina. 

 By Robert M<Lachlan, F.R.S. &c. 



The new species here noticed form a portion of the 

 undescribed material I possess in the subfamily. The 

 sequence adopted is that of Dr. Karsch (1891), which in 

 several respects seems an improvement on that of Baron de 

 Selys (1883), especially in the discovery of important neural 

 characters. But I am of opinion that the formation of the 

 tenth ventral segment in the female will prove of more 

 importance than the later system allows to it, more especially 

 as the condition seen in Oynacantha is repeated in a North- 

 Indian genus (not here characterized) allied to Cephalceschna* 

 and Calliceschna by neuration. 



In the descriptions that follow I have adopted the minute 

 details of neural characters used by Dr. Karsch. It is 

 probable that eventually a plan of grouping species will 

 obviate the necessity for such exactitude. A certain amount 

 of latitude must be accorded to the interpretation of these 

 details, for at present they are often drawn up from very 

 limited material. 



Anaciceschna triangulifera, sp. n. 

 $ . Face dingy whitish or yellowish ', top of front clothed 

 * Cf. Cephalceschna sikki?na, Karsch. 

 Ann. & Mag. N. Hist. (Ser. 6. Vol. xvii. 29 



