1902.] DRAGOXFLIES OF THE " SKEAT EXPEDITION." 385' 



ISTo supplementary basal postcostal nerve. Lower lip with short, 

 rounded lobes. Lower sector of quadrilateral entirely absent. 



Very slender body. Basal postcostal nerve lying between the 

 level of the two costal antenodal nerves. Upper sector of the 

 quadrilateral of the fore wings not reaching to the first trans- 

 verse nerve after the quadrilateral ; in the hind wing it extends 

 one cell further. 14 postcostal nerves on the fore wing. 



Certainly closely allied to G. gracillima as described by 

 de Selys, but with the following points of difference : — Upper 

 lip entirely black. Segments 2, 3 of abdomen without a pale 

 dorsal stripe. 



C. gracillima is said by Selys to come probably from the 

 Celebes or possibly from Borneo. Kriiger (Stett. ent. Zeit. 

 1898) remarks that the species known hitherto belonging to the 

 " gracillima " section of the genus all came from Borneo. He 

 describes a new species belonging to this section from Sumatra. 

 The present specimen is in all probability a representative form 

 of 0. gracillima, and when better known will most likely require 

 naming as a distinct species. 



Legion Platycnemis. 



*TrichocxeMis membraxipes (Rambur). 

 Singapore. Malacca. 



*Trichoc!nemis octogesima Selys, 

 Singapore. 



Trichocnemis borneexsis Selys. 



Ccdiccia bor7ieensis Kirby, Cat. Odonata, p. 128. 



1 c? , 4 2 from Kwala Aring belong, I believe, to this species. 

 Mr. Annandale's collection includes a fine series of insects belong- 

 ing to this genus ; accordingly I prefer to leave these specimens 

 without comment for the present, 



■■■■Copera vittata (Selys), 

 Malacca. 



Copera margixipes (Ramb.). 



Copera marginipes Kirby, Cat. Odonata, p. 129. 



Psilocnemis marginipes Kriiger, Stett. ent. Zeit. 1898, p. 101. 



Four males and a female from Kwala Aring, Sept, 1899. 



These agree closely with Selys's description, but the males have 

 the epistome and genee largely yellow. The posterior pair of 

 tibias of the males are strongly dilated, and the upper anal 

 appendages are only one-fourth the length of the lower pair. 



Proc. Zool. See— 1902, Yol. II,' No. XXY. 25 



