NOTES ON ODONATA OBSERVED IN GREAT BRITAIN. 285 



7. ^Eschna mixta, Latr. — A single male was certainly seen at 

 a weir near Marlow, on the Thames, but could not be captured. 

 After flying erratically for a considerable time, it settled on a 

 reed, and I was able to approach near enough to determine its 

 sex and identity. The observation was made on September 11th. 



8. lE. cijanea, Miill. — Four nymphs, which I had kept for 

 more than six months, emerged between July 30th and August 

 8th. The nymphs had been obtained in Shenley. A female 

 was found near Tunbridge Wells, on August 5th, in a very imma- 

 ture condition, with the nymph-case hanging to some grass 

 beneath it. The latter lacked its head. 



9. M. grandis, L. — Several were seen at Shenley, Herts, on 

 August 11th, and several nymph-cases were found clinging to reeds. 



10. Calopteryx splendens, Harr., was common at Oxford in 

 June. On May 30th a male was caught with a large mayfly in 

 its jaws, half of which it had eaten. 



11. Lestes sponsa, Hans., was again very abundant near Tun- 

 bridge Wells in August. A female captured on August 8th had 

 the sides of the bronze spot on segment 1 of the abdomen 

 resembling that found in L. dryas, but the size of the insect and 

 form of the anal appendages point without doubt to its identity 

 with the commoner species. 



12. Erythromma naias, Hans. — A single immature male was 

 taken on the Cherwell at Oxford, on May 15th. It was found 

 sparingly at Shenley during June and July. 



13. Platycnemis pennipes, Pall., was common on the Cherwell 

 at Oxford during May and June. It was flrst observed on 

 May 15th. 



14. Pyrrhosoma nymphula was common near Tunbridge 

 Wells in August. A female, for the measurement of which I 

 am indebted to Mr. Campion, was only 33 mm. in length, the 

 wing-expanse being 43 mm. 



15. P. tenellum, L., was not very plentiful near Tunbridge 

 Wells. 



16. Ischnura elegans, Van der L., was generally abundant at 

 Oxford in May, and at Shenley during June and July ; also near 

 Tunbridge W^ells. 



17. Agrion pulchellmn, Van der L. — Common on the Cherwell 

 at Oxford in May. 



18. Agrion puella, L., was found commonly from May to 

 August at Shenley, Herts, on the Cherwell at Oxford, and near 

 Tunbridge Wells. 



19. Enallagma cyathigerum, Charp., was very plentiful at 

 Shenley in July and August, the blue form of the female being 

 taken on several occasions. The spot on segment 1 of the 

 abdomen of the male showed great tendency to variation in size. 

 The dragonfly was also observed again near Tunbridge Wells in 

 August. 



