NOTES ON THE DRAGONFLY SEASON OF 1910. 239 



A single male of Gomphus vulgatissimus was taken by Mr. 

 Watts at Ej-nsbam, near Oxford, on June 16tb. 



A female of Brachytron hafiiiense (= B. pratense) was pro- 

 cured at Eamsey (Hunts) on June 21st. [In July, 1897, an 

 exceptionally late date for tbe species, a very fine female occurred 

 to Mr. K. J. Morton at Monkswood, in the same county.] jEschna 

 mixta, Mr. Watts informed us, was met with again at Pul- 

 borough, Sussex; a few males were taken by ourselves at Staines 

 (October 2nd), and the species was also observed at the same 

 place on October 16th. A male of ^E. cyanea, taken at Ealing 

 on September 28th, was given to us by Mr. Charles C. Smith. 

 On June 27th it was found that a male nymph of ^E. grandis, 

 obtained at Burnham Beeches by Mr. H. F. Ashby (June 19th), 

 and kejjt indoors, had already disclosed the imago. The species 

 was seen in flight at the Black Pond on September 13th, and at 

 Staines on October 2nd. 



Calopteryx splendens, as usual, was flying in numbers over 

 the River Ouse, near Huntingdon, during June. An interesting 

 male taken on the 25th of that month had the right fore wing 

 considerably reduced in size, and the venation of the apical area 

 in a very aberrant condition. 



Both of the British species of Lestinfe were met with, Lestes 

 dry as, in teneral condition, near Eamsey, on June 21st, and 

 L. sponsa at Byfleet, Surrey, on July 24th and August 4th 

 and 7th. 



Specimens of Platycncmis pennipes were obtained at Wolver- 

 cote, Gloucestershire, on June 17th. Erythronima naias was 

 taken at Staines (May 22nd), Lechlade, Gloucestershire (June 

 15th), Wolvercote (June 17th), Holme (June 20th), and Byfleet 

 (August 7th) ; and Pyrrhosoma nymphida at Staines, Lechlade 

 (including the female var. fulvipes), Burnham Beeches, Holme, 

 Ramsey, and Byfleet. 



Ischnura elegans occurred at Staines, Lechlade, Wolvercote, 

 Holme, Ramsey, Hartford, and Byfleet. Immature specimens 

 were plentiful at Hartford on June 25th and August 1st, and 

 others were met with at Byfleet as late as August 7th. At 

 Byfleet (August 4th) a male had larval water-mites on the under 

 surface of segments four, five, six, and seven ; in the case of 

 segments six and seven the mites had lodged themselves in the 

 ventral canal and caused a considerable distension of the abdomen. 

 At the same place (August 7th) a male with an insect in its jaws 

 was kept under observation for some little time ; it was ulti- 

 mately captured, and the prey found to be a small caddis-fly, 

 which Mr. K. J. Morton was kind enough to determine for us as 

 Tricenodes hicolor. This observation was especially interesting, 

 as being the first instance within our knowledge of an Odouate 

 feeding upon one of the Trichoptera. On the same occasion 

 evidence was obtained of /. degans itself having fallen a victim 



