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VIII. Description of a new Dragon-fly (Gynacantha), 

 from Borneo. By Chas. O. Wateehouse. 



[Read February 6th, 1878.] 



(PI. IV.) 



At the Jiuie Meeting of this Society I exhibited and 

 gave a brief description of perhaps the largest species of 

 Dragon-fly knoAvn, and at the time I promised to give a 

 fuller description of the specimen. I have not been able 

 to do so until now, chiefly on account of the difficulty in 

 getting the plate drawn which Avas to accompany my 

 description. 



The specimen was lent me by Mr. Hugh Low, who 

 received it from Borneo. 



Gynacantha plagiata, C. Waterh., ?, PL IV. Proc. 

 Ent. Soc, Oct. 1877, p. 10. 



Head with the vertex and occiput pitchy black; the 

 face, labrum, base of the mandibles ancl the back of the 

 head yelloAvish. Thorax fuscous, with two broad oblique 

 fulvous stripes on each side. The abdomen is dark pitchy, 

 but is doubtless much discoloured ; the 8th and 9th seg- 

 ments above end on their posterior margin in a strong 

 sharp triangular tooth, that on the 8th being the smaller ; 

 the superior appendages of the 10th segment very slender 

 (almost filiform), acute ; the 10th segment beneath with 

 four short strong acute triangular teeth. The AAdngs are 

 hyaline, but have a pitchy-brown border along the anterior 

 margin as far as the stigma, and a broad band of the same 

 colour across each wing near the apex, that on the posterior 

 wing extends rather more along the posterior margin than 

 in the fore wings. The stigma is dark pitchy, that of the 

 fore wings is 4 mill., that of the hind wings nearly 5 mill, 

 long. 



The neuration of the wings and the remarkable struc- 

 ture of the apical segments of the abdomen are well repre- 

 sented in the plate ; the abdomen itself, however, is rather 

 too narrow in the figure, especially in the middle. Legs 

 black, with the femora piceous except at the apex. 



TEANS. ent. soc. 1878. — PART I. (aPR.) 



