172 THE ENTOMOLOGIST. 



were out along the banks of the Lahn towards Giessen. I did 

 not observe the species again until June 10th, when I took males 

 only at the pond adjoining the Lahn. After this it was some- 

 times plentiful in all the localities except in the brickyard. On 

 July 19th the last specimens were observed. 



The dragonfly was subject to great variation in size, and in 

 some males the blue markings on the abdominal segments were 

 considerably reduced. 



A. puclla, Linn. — The dragonfly was common everywhere 

 during May, June, and July. Li August it became scarce, but it 

 lasted till September 8th, when I took the last specimen observed, 

 a male. 



A. lindenii, Selys. — This interesting species appeared once 

 only. On September 19th, while walking along the edge of the 

 pond near the Southern Kailway Station, I drove a mature male 

 out of the grass. 



This dragonfly is at once distinguishable from other Agrionids 

 by the anal appendages, which are semicircular, rather remind- 

 ing one of the genus Lestes. The abdomen is also curiously 

 thickened towards its extremity. A separate genus will no doubt 

 be allotted to this dragonfly. 



Enallagma ci/athigerum, Charp. — This dragonfly was plentiful 

 from June 9th till August 31st. I took one specimen of the blue 

 variety of the female on July 19th. 



Owing to the wet weather experienced during the summer, it 

 is probable that several species did not appear. Representatives 

 of the genera Anax, Brachytron, ^Eschna, Lihcllula, Gomphus, 

 and Orthetrum, not observed, no doubt occur at Marburg, and Mr. 

 Morton suggests Cordulia flavomaculata also. 



FIELD NOTES ON BRITISH SAWFLIES. 



By Claude Morley, F.E.S., &c. 



The Rev. F. D. Morice's invaluable " Help-Notes towards the 

 Determination of British Tenthredinidse," which have been ap- 

 pearing in the Ent. Mo. Mag. since 1903, and are still far from 

 completion, have so stimulated hymenopterists in the study of 

 our indigenous sawflies that an account of those with which I 

 have personally met during the course of the last twelve or 

 thirteen years may not be without some slight, though, I fear, 

 more or less local, interest. Mr. Morice has not pretended to 

 treat of the distribution, comparative frequency, habits, or 

 economy of these insects, concerning which little or nothing has 

 been published (as far as I am aware) since the completion of 

 Cameron's Monograph in 1892. I will at once state that I have 

 no especial knowledge of this group of insects, that my acquaint- 



