Agrion. 295 



escape from the consequence of further evaporation." * 

 The nicrcnrialc that I met with in the New Forest 

 seemed to prefer fast running" streams rather than muddy 

 ditches, though of course they may not oviposit in tlie 

 former, for there was a bog close at hand, on which 

 indeed several were seen. 



Date. 



Mr. McLachlan has taken it in Junef in the New 

 Forest, and I have myself found it there as late as 

 August 14, when it was by no means over. 



Nymph. 



Lcnotli, including caudal lamella:?, i6mm. ; ividtJi of 

 abdomen r75mm. Head, somewhat pentagonal, rather 

 narrow from front to back. Eyes rather large, in posi- 

 tion and shape resembling those of P. iiyiiipliula. 

 AntoDuc seven-jointed, basal two joints stout, rest 

 slender, second and third long, others decreasing to 

 tip, distal one small ; a ring of hairs round the more 

 slender joints near apical end. Mask flat, of the usual 

 Agrionine shape, extending to the insertion of the first 

 pair of legs ; palpi bearing a row of hairs near the 

 outer margin ; part of a circle of hairs on body of 

 mask ; middle lobe making nearly a right angle, margin 

 serrated ; tip of palpus with inner point sharp, and 

 outer cut squarish and notched ; movable hook long, 

 curved, sharp. A double pale spot on tof^ of head, 

 and some brown markings, but not definite on the 

 empty case. Oeciput appears to be ver}- narrow in 

 centre with dark marks on front margin ; sides sloping 



*E. M. M., 1S85, p. 211. fE. M. M. 1896, p. 181. 



