Lestes. 235 



Immature Colouring". 



Till the blue powder appears, the male resembles the 

 female in colour ; and at that time the twin green spot 

 on segment i is visible, and assists in distinguishing 

 this species from. L. d/yas. The pterostigma is yellowish. 



Variation. 



This species does not appear to be subject to much 

 variation. 



Oviposition. 



Mr. P. Calvert states * that Von Siebold saw the 

 female descend below the surface of the water, as seems 

 to be customary with the genera Agn'oii and Enallagnia ; 

 but in this case the male accompanied the female below 

 the surface. The dirt)- appearance often presented by 

 the abdomen of the female suggests oviposition in the 

 mud. 



Nymph. 



Length, including caudal lamelhe, 26- 5mm., icidtJi ot 

 abdomen, 2'25mm. Head a flattened pentagon ; narrow 

 from front to back ; about 35 mm. across transversel}'. 

 Eyes large ; apparentl>- hemispherical when entire ; 

 situated at the fore lateral corners of the head. Aiitenme 

 seven-jointed ; very long ; basal two joints stout, next 

 more slender, distal four very slender. Mask ladle-shaped ; 

 stem very fine, then suddenl}- swelling out near the end 

 to a spoon shape ; extending to the insertion of the 

 hind-legs ; long hairs in a line broken in two on bod}' 



* Transactions of Amer. Ent. Soc, xx. p. \i 



