1913]. 271 



THE ODONATA, TRICHOPTERA, NEUROPTERA AND PLECOPTERA 

 OF WOOD WALTON FEN, HUNTINGDONSHIEE. 



BY KENNETH J. MORTON, F.E.S. 



Eecently the Hon. N. diaries Rotlischild very kindly gave ine a 

 large collection of Odonata, Trichoptera, and other Neuropteroid 

 insects, numbering several hundreds, taken during the past season in 

 Huntingdonshire on Wood Walton Fen, which is partly Mr. Roths- 

 child's property. As it is very seldom that one has the opportunity 

 of examining the results of the collecting of such insects in a re- 

 stricted locality over a long period (extending from April 22nd to 

 September lOtli), and as in the present case the date of capture of 

 3acli specimen has been carefully noted, it seems desirable to place 

 these results on record. 



Although no actual rarity is included, the collection may be 

 regarded as giving a very good representation of the Neuropteroid fen 

 fauna. It will he seen that dragon-flies form the bulk of the 

 collection. They belong to 12 species and they comprise many teneral 

 specimens, which have been freely taken along with the others of more 

 mature age. The former, being less satisfactory for the cabinet, are 

 usually avoided, and in the present case they add no little interest as 

 they serve to show the continuous succession of fresh emergences 

 which goes on over a considerable period in certain species. No 

 attempt has been made to divide the teneral state into different 

 grades, some of the specimens being in the limp state of the newly 

 emerged imago, while others have attained a fairly firm condition. 

 What appears to be a fairly good dividing point is to be found in the 

 pterostigma and all specimens in which the mature coloration of that 

 mark has not begun to show have been treated as teneral : — 



The species are as follows : — 



Odonata. 

 Lestes spousa, Hansemann. — 1 (^,4 ? s. 

 June 30th, 1 9 (ten.). July 21st, 1 '? (ten.). July 2etli, 1 c? • July 28th 

 1 9 (ten.). August 5th, 1 ? (ten.). 



Ischnnra elegaris, Vanderl. — 44 (^ s, 52 $ s. 



May 28th, 2 S (ten.); 4 ? (2 ten.). May 29th, 1 J (ten.); 1 "? (ten.). 

 May 31st, 3 S (2 ten.) ; 2 ? . June 1st, 2 ^ (ten.) ; 3 ? (2 ten.). June 2nd, 

 5 <J (4 ten.); 8 ? (6 ten.). June 3rd, 3 <? (1 ten.) ; 3 ? (2 ten.). June -Ith, 



1 (? ; 1 9 (ten.). June 5th, 2 ^ (ten.) ; 4 9 (ten.). June 8th, 1 9 • June 

 12th, 1 c? (ten.); 3 ? (ten.). June 13th, 2 3 (1 ten.). June 14th, 3 <? (2 ten.) ; 



2 9 (ten.). June 15th, 1 ^ (Iten.). June 16th, 1 J ; 2 9 (Iten.). June 17th, 



