BORNEAN DRAGONFLIES. 39 



Stenagrion, gen. nov. 



Wings petiolated to the level of A*. Quadrilateral long. 

 M 3 rises from subnodus, Its a little distal. Tarsal claws toothed. 

 Body very slender ; male with simple upper anal appendages, 

 female with simple posterior- prothoracic margin, no ventral spine 

 on eighth abdominal segment. Postocular spots present. 



This genus would appear to be in series with Pseudagrion, 

 Stenobasis ( — Archibasis), and Teinobasis. It differs from them 

 all by the simple character of the anal appendages of the male 

 and in the relative length of the upper margin of its quadri- 

 lateral, in which respect it resembles Amjjhicnemis. 



21. Stenagrion dubium (Laidlaw). 



Pseudagrion ? dubium Laidlaw, Journ. It. Asiat. Soc. Str. Bi% 

 no. 63, 1912, p. 97, pi. fig. 5. 



1 6 , 2 $ $ . 6, 9, 16.9.13 (Nos. 17, 47, 73, 1914). 



These specimens undoubtedly belong to the species described 

 by me as Pseudagrion ? dubium (loc. cit.). 



They show that there is a well-defined pair of postocular 

 spots, nearly obliterated in the type-specimen ; and in addition, 

 on the dorsum of the thorax on either side of the middle line 

 lies a broad blue band, interrupted at its middle by a transverse 

 black line. These markings are present in both sexes, but 

 in the type-specimen, which is a very mature individual, they 

 can scarcely be distinguished. 



