274 [December, 



Plecoptera. 

 Nemoura variegata, Oliv., 1 (J, April 30tli ; 1 <? , May 10th; 1 ? , May 11th. 



A few uotes on some of the species may be added. It is difficult 

 to explain the scanty number of Leftie.^ sponsa and Enallaynia cyathi- 

 ijerum. The Lestes is usually common where it occurs ; E. cyathigervm 

 is also rather common as a rule, although Ris points out (die 

 schweizerischen Libellen, 1885), that where it occurs along with 

 I. elegans and Agrion puella and imlchellum in Switzerland, it is 

 decidedly not so common as the others. 



Of Isclinura elegans, six of the females belong to the orange form. 

 Pairs of this species were taken on Jime 16th and 27th. 



In Agrion pnlchellum there are three males with the second 

 abdominal segment marked as in puella. Pairs occurred on June 2nd 

 and 21st. 



Agrion puella. The most noteworthy variation in the ,^ is I'epre- 

 sented by three examples in which the lateral lines of the marking on 

 the 2nd abdominal segment are separated from the transverse line. 

 A pair captui'ed June 2nd. 



Pyrrhosoma nymphula. Pairs, June 1st and 2nd. 



Brachytron hafniense. The comparatively short period of flight 

 in this species is well known. It seems to last just about a month 

 as a rule. 



. JEschna grandis. Eis {op. cit., p. 34) remarks that the females 

 of this species are decidedly more numerous than the nmles, but this 

 does not appear to be the case universally ; the males being represented 

 in the present collection in the proportion of 3 to 1 female. On the 

 other hand, in jE. cyanea, the females are strongly in the majority. 



The comparative absence of mature specimens of Sympetruni 

 sanguinenm may be due to its rather active and wary habits. 



Reference to the Odonata of Huntingdonshire will be found in 

 Ent. Mo. Mag., XXXIII, pp. 275-8 (Morton), and in sundry notes in 

 the " Entomologist " for 1907 and the succeeding years, by Mr. F. W. 

 Campion and Mr. Herbert Campion. 



Edinl)iu-^h : 



November '2nd, 1913. 



