170 THE ENTOMOLOGIST. 



this was one of the most plentiful. It was out on the banks of 

 the Lahn towards Giessen on June 2nd in large numbers, and on 

 September 2ud I still took specimens. In June and July it was 

 plentiful in fields, and I took several specimens on bushes on the 

 sides of the mountains on June 18th. 



"When immature I took var. lactea only, but later var. bilineata 

 and the normal form were also abundant. 



Erythromma naias, Hans. — On May 25th the dragonfly was 

 out along the river. In June it was plentiful at all the localities 

 with the exception of the brickyard and marsh ; but in July it 

 became scarce, and on July 8th I thought I had seen the last of 

 it. But on August 3rd I took a single male at the pond near the 

 Southern Eailway Station. 



On the under side of the bodies of males there were often 

 large numbers of red Acari. 



E. viridulum, Charp. — I found this minute dragonfly at the 

 pond near the Soutbern Eailway Station. On July 22nd it was 

 not very plentiful, and all the specimens taken were very imma- 

 ture ; in this state they were difficult to distinguish from Ischnura 

 painiiio. The female was at this time the more plentiful. On 

 August 3rd both sexes were very abundant, and they continued 

 to be so till August 31st. On September 9th I took two speci- 

 mens only, and on September 23rd again two ; the latter were 

 worn. 



The habits of this species are rather similar to those of its 

 larger congener, but it is less shy and does not fly over the 

 water so much. The dragonfly does not go far from water when 

 immature, but flies slowly about bushes close to its native pond. 



On August 27th a male of this species was found in the 

 jaws of the female L. dryas taken at the pond near the Southern 

 Eailway Station. 



Pyrrhosoma nymphula, Sulz. — Although more or less well 

 distributed, the dragonfly was never at all plentiful, and the 

 time of flight was short, unless it was spent far from water. On 

 June 9th I took the first specimen, and on June 13th it was not 

 uncommon, but after June 27th I did not notice it again until 

 August 3rd, when I took a single male. The brickyard and the 

 marsh were the only two places where I did not find it. Perhaps 

 the species is more abundant in favourable summers. 



Ischnura piimilio, Charp. — On May 23rd a single immature 

 male was taken in the brickyard. I did not record it again, and 

 cannot account for its appearance. 



I. elegans, Van der Linn. — Was as common as P. pennipes. 

 As early as May 25th I took specimens in the brickyard, and it 

 was abundant everywhere until August 31st, after which date I 

 did not observe it. The female var. riifescens was plentiful, but 

 the normal forms were more numerous. 



Agrion pidchellum, Lind. — On May 25th several females 



