British Dragonflies. 



segmento et nonnunquam etiam priino cacruleis. Subtiis, 

 caput, oculi, pectus pallidc caerulescentia, abdomen 

 virescens apice caeruleo. Pedes pallid i, femoribus supra 

 nigris. Alae alba; macula marginali obscura, sa;pius 

 puncto nigro notata. Femina supra fusca puncto post 

 oculum utrumque, lineaque longitudinali in thorace 

 viridi luteis : subtus virescens. Saepe penultimum 

 abdominis segmentum pallidius est, aliquando punctis 

 duobus caerulescentibus notatum. Femina etiam aliquando 

 mari simillima est, abdomine tantum crassiori. (P. L. 

 Vander Linden, " Opuscoli Scientifici," torn. i\'., 

 p. 104, 1823). 



[Vander Linden speaks ol the penultimate segment (/.<'•, tlie 

 ninth) as being bhie, whereas it is the eighth in /. elegans, and the 

 ninth in I. piimiUo. In his figure, however, the blue segment seems to 

 be the eighth, and in the diagnosis he speaks of the female as some- 

 times having the blue segment like male, which is not the ca^e in 

 pumilio ; moreover, De Selys says that all the specimens in Vander 

 Linden's collection represented c/cf^rt'/ii- and \\oi puniilio.'\ 



Size, 



Length of Male, about 30mm. to 33mm. ; expanse of 

 wings, about 33mm. to 35mm. Length of P^emale, 30mm. 

 to 33mm. ; expanse of wings, 35mm. to 37'5mm. 



Male Imago. 



Face greenish ; nasus and base of labrum black ; top 

 of head black. Eyes greenish ; behind the eyes a circular 

 blue spot. Protliorax small, black, hind-margin produced 

 in centre in a long, raised, blunt lobe. Tliorax black 

 above, with a narrow bhic line on each side ; blue on the 

 sides ; }-ellowish below ; projections between wings blue. 

 Leers black above, bluish below. JTiz/os hyaline. 

 Pterostigina rhomboidal, yellow ; inner bounding ncrvures 



