﻿DORSET ODONATA IN 1911. 201 



most of the posterior margin dark castaneous, the inner half of the 

 posterior margin greyish brown ; head, inckiding eyes, about as wide 

 as base of mesonotum, not frontally produced, anteriorly subtruncate, 

 ocelli large, the frontal ocellus almost visible beneath above face ; 

 face longer than broad, strongly, centrally, longitudinally sulcate, 

 finely, transversely striate, cheeks globosely prominent ; antennas 

 black ; pronotum with the lateral margins ampliated, and broadly, 

 centrally angulated, about as long as mesonotum in front of the 

 cruciform elevation ; abdomen moderately elongate, but not longer 

 than space between apex of head and base of cruciform elevation ; 

 opercula in male short, obliquely rounded, not extending beyond 

 basal segment of abdomen, and almost meeting internally ; rostrum 

 reaching the posterior coxae, its apex black ; abdomen beneath with 

 the stigmatal spots ivory white. Long. excl. tegm. ^ 27 milhm.; 

 exp. tegm. 75 millim. 



Hab. West Africa; Liberia (W. P. Lowe — Brit. Mus.). 



A very distinct species, belonging to the section of the genus 

 characterized by having opaquely coloured tegmina and wings, 

 and may be placed near P. makaga, Dist. 



DORSET ODONATA IN 1911. 

 By F. H. Haines, D.P.H. (Lond.l, &c. 



A FEW observations made by me round Wiufrith last summer 

 may be of interest in connection with Mr. Lucas's notes on 

 British Odonata in 1911. 



Si/mpetrum striolatum and S. scoticnm were abundant as usual. 

 The latter is generally confined to fenny places, near the heath- 

 lands. LibelMa depressa is always widely distributed and com- 

 mon. I first noticed L. qiiadrimaculata, in great abundance, 

 round a large pond on Morden Heath, on May 27tb. On June 

 20th, it was common at Trigon near Wareham, and was far 

 more widespread than usual in all suitable spots, such as open 

 fir-woods and wet moors, from Holme to Moreton throughout June. 

 L. fiilva occurs every year, in some plenty, over a few square 

 yards of ground near a boggy area at Holme. Here it settles 

 very warily on small fir-trees and furze bushes. Once known, 

 flying or settled, it could not be easily confused with any other 

 species. It is to be found at the end of May, and blue males 

 are seen quite at the beginning of June. Last year it was in 

 remarkable profusion here and there over the same stretch of 

 wild country as L. quadrimacidata, and continued well into 

 July. Orthetrum cceridescens abounds over the heathy swamps 

 every year, and I noticed, as I had not done previously, 0. can- 

 cellatiim at East Lulworth and Moreton in sandy hollows and on 

 the road. Cordulia cenea swarmed at Morden on May 27th on a 

 very large extent of morass and wet fir plantations, and over the 



