1001.] 39 



recent catalogues as a syiiouyui of B. pyrenodum, so that the name may 

 l)e applied to the Sierra Nevada species without giving rise to any con- 

 fusion. Kambur collected I believe in the same spot as that in which 

 the specimens before me were found, viz., near the top of the great 

 valley in the Alpujarras, leading up from Lanjaron to the high ridge 

 in propinquity to the summit of Mu]ha9en. 



The individuals from the snow-fields of the Sierra Guadarrama 

 certainly approach considerably to the Cantabrian form. In size and 

 general appearance they resemble B. viontanum, but the thorax has 

 the basal constricted portion less elongate. This form may bear the 

 name of B. carpetnnum. Although I think it probable that if speci- 

 mens were captured in large numbers all the forms, including B. 

 glnciale, would be found to be connected ; yet, as the great majority 

 of specimens can apparently be separated, it is well to have distinct 

 names for the forms. 



Cambridge : October 16th, 1900. 



CHRYSOPA DORS ALTS, Bttem., A SPECIES NEW TO BRITAIN. 



BY ROBERT McLACHLAN, F.R.S., &c. 



Amongst some Neuroptera collected by Mr. Beaumont in 1900 I 

 find a very good example of this rather striking species, taken at 

 Oxshott, Surrey, on July 7th. It is a fir-frequenting insect, widely 

 spread over Europe, extending to Scandinavia, but possibly nowhere 

 very common. Personally I have met with it only in Belgium and 

 Switzerland, in single examples. 



Ch. dorsaJis is much like Ch. peria, L., and is liable to be confounded there- 

 with. It is of the same form, with much black on the body, and the neuration very 

 nuich mixed with black. Ch. perla can always be distinguished by the distinct 

 blue-gveon colour of the pale parts, very conspicuous on the wing. In Ch. dorsalis 

 the body colour is yellowish-green rather than blue-green, and there is a very broad 

 unbroken black margin on either side of the pronotum ; in perla this margin is 

 more or less broken up by the pale ground : the sub-costa in the anterioa-wings is 

 black in dorsalis, at any rate in its basal half; it is green in perla : the costal area 

 in the anterior wings is much narrower in dorsalis : and as a structural character 

 of great importance the tarsal claws are simple in dorsalis (as in phyllochroma, 

 Wesm., &c.), and much dilated at the base in perla : there are also differences in 

 the markings of the head, &c., but the characters above-noticed will suffice to se- 

 parate the two. A variety in which the femora are more or less piceous has received 

 the name of pini (Brauer). 



Mr. Beaumont has generously allowed me to retain the specimen_ 

 Although many insects of comparatively feeble flight are liable to 

 appear " sporadically " in an unaccountable manner, I think it more 

 likely that Gh. dorsalis has been overlooked, on account of its re- 

 semblance to perla, by the few^ entomologists who attend to these 

 insects. 



Lewisham, London : Dec. 2^rd, 1900. 



