432 Mr. K. M'LacLlan on 



I think it prudent to consider the specimens as constituting 

 only a local form or race. 



Among European species 0. japonicum closely resembles 

 0. hrunneum in size and general form, and 0. cancellatum in 

 the structure of the genitalia of the second segment. 



Orthetrum melania^ Selys. 



One male. 



Tlie spot at the base of the posterior wings is slightly 

 smaller than in Japanese examples ; otherwise I see no 

 difference. 



Crocothemis serviliaj Drury. 

 One female. 



A grionoptera (?), sp. 



One male, very doubtfully pertaining to this genus, left for 

 further consideration. 



Subfam. CoRBULEGASTEINA. 



Cordulegaster pehinensis^ Selys. 



One pair ((5' ? )• 



The male appears to agree sufficiently with the description, 

 but is smaller (length of posterior wing 41 millim., of abdomen 

 50 millim.). The female agrees with the male in all essen- 

 tial characters : length of posterior wing 48 millim., of ptero- 

 stigma 41 millim., of abdomen 54 millim.; 17 antenodal 

 nervules in anterior wings. 



De Selys queries the species as probably only a race of 

 luniferus, Selys. The latter was from Moupin, in the same 

 district as Ta-chien-lu ; but the pair before me agree far 

 better with 2)cJci7}ensis. The anal appendages of the male 

 difler from those of the European hidentatus in liaving the 

 upper (or subnicdian) tooth almost as pronounced as the lower. 

 The anal triangle of the ])osterior wings has four cellules in 

 pekinensis and three in hidentatus. 



Subfam. yEscnyiyA. 



^^2schna junccttj L. ? 

 One female, doubtful in the absence of the male. 



