182 THE SCOTTISH NATURALIST 



equal thickness for the basal two-thirds, the tip third distinctly 

 thickened, the pubescence very weak except upon the thickened 

 portion, where it is long and erect, bristling normal, but the 

 antero-dorsal one situated higher on the tibia than the postero- 

 dorsal one ; hind femora with the antero-ventral surface with a 

 row of short, widely placed bristles from base to tip, the last 

 two or three longest; the basal half of the postero-ventral 

 surface clothed with long, soft hairs; the other bristling 

 normal ; wings darkened, third and fourth veins convergent, 

 last portion of fourth vein three times the penultimate, outer 

 cross-vein distinctly bent; calyptra blackish, equal in size; 

 halteres yellow. 

 9 . Stein describes the 9 as having much the appearance of 

 a'erea and parva. From a'erea it differs in the yellow colour 

 of its fore knees, in the absence of the basal ventral bristle on 

 the mid femora, and though the middle stripe on the frons is 

 grey dusted it is not so much so in acrea. From parva it 

 differs in the dusting of the middle stripe, in its black-grey body 

 colour, and in the form of the frons in profile. 3 \ to 4 mm. 



One <£, Bonhill, 13th June 1908; one £, Cardross, 24th 

 July 1908. I have not recognised the '9 . 



(To be continued?) 



ODONATA OF THE NORTH OF SCOTLAND, 191 1. 



By W. J. Lucas, B.A., F.E.S. 



DURING his visit to the north of Scotland in the summer of 

 191 1, Col. J. W. Yerbury collected for me a considerable 

 number of Dragon-flies of nine or ten species. Many of 

 them were obtained from poorly worked localities, and 

 were therefore of more than ordinary interest. 



First on the list, and probably also first in importance, 

 was a pair of specimens of a Sympetrum — either a new 

 species, or a very distinct race of 5. striolatum, which I have 

 described in the Entomologist, vol. xlv. (191 2), p. 171, as 

 Sympetrum nigrescens. In size it is intermediate between 

 S. striolatum and 5. scoticum, and as its coloration is dark, 

 the impression is given of the latter species. The ptero- 



