154 



British Dragonfiies. 



Variation. 



De Selys"^ mentions that Dr. liagen once took a 

 male with the dorsal yellow line prolonged to the 

 eighth segment, and appearing on the ninth as a 

 yellow point. These characters disappeared at death. 



^^i 



Fig. 32. — NvMPH OF Gomphus vuLGATissnirs 



(X 2). 

 (After L. Cabot.) 



Nymph (h'ig. 32). 



"Length, 31mm.; breadth, 8mm. Head cordate, flat. 



Eyes large, prominent. Ocelli developed. Oblique 



groove extending from lateral ocellus to front angle of 



eye. Vertex square, a little elexated. Part behind the 



* " Revue des Odonates," p. 83. 



