4 1 6 LIFE-HISTORY OF LESTES LED A SELYS, 



following is a detailed description of a typical full-grown nymph 

 (Plate xxxii., fig.2) : — 



Total length (to tip of lateral gill-plates) 26-27 mm. 



Head rather wide (4 mm.), transparent green. Ocelli reniform, 

 the front one largest; outlined in black or dark brown, and form- 

 ing three sides of a square the base of which is absent. Antennae 

 slender, 2'5 mm., almost colourless, transparent; a darker patch 

 on the basal joint. Eyes brown above, shading from a very pale 

 transparent brown in front to a very dark brown behind, next 

 the orbits; underneath an opaque white. Orbits and occiput 

 transparent greenish. Labial mask pale green, length when 

 extended 6 - 3 mm. (Plate xxxii., figs. 3, 4). 



Thorax : Prothorax well developed, transparent green with two 

 brownish humeral rays reaching to the bases of the wing-cases. 

 Meso- and metathorax green, covered dorsally by the wing-cases. 

 Sides pale green. Wing-cases brownish, arranged longitudinally 

 down the thorax (see Plate) and reaching along the abdomen 

 down to about the middle of the fourth segment; length 5*2-5"3 

 mm. Legs pale dirty brownish, transparent, with darker spots 

 near the joints and along the femora and tibiae. In some speci- 

 mens the legs are practically colourless and transparent. 



Abdomen transparent green shaded prettily with darker olive- 

 green; on each side of segments 2-6, near the base, is a small 

 blackish spot; at the anal end of each segment, on either side of 

 the dorsal carina, is a larger but less distinct blackish spot. 

 Dorsal carina pale, transparent and clearly marked, being enclosed 

 by dark olive-green markings on each segment as shown in the 

 figure, forming a pale, somewhat diamond-shaped space in the 

 centre of segments 2-7; there is also a darker parallel patch of 

 olive-green on either side of all the segments. Underside pale 

 fleshy-green. 



Caudal gill-plates three, one medial (dorsal) and two lateral 

 [see Plate xxxii., fig.5 (medial), fig.6 (lateral)]. Length, medial, 

 6 - 8 mm., lateral 7 mm. In the position of rest (Plate xxxii., fig.7) 

 these gill-plates stand in three vertical planes, the two lateral 

 ones with their main longitudinal tracheae almost horizontal and 



