1020.] gl 



that of its saw-slieatli, in Loth of which characters it agrees tolerably well 

 with Pseudotoxonus. In the venation of its hind wing it differs from 

 any British species of the same group ; and it has no superficial resem- 

 blance to any of them except Stromhoceros deUcatidus, of which, 

 however, it is certainl}^ no near relation. 



(I may here add th^i filicis, tlioujili it is a well-known species in Central 

 Europe, seeuLs to be at leasit as great a riirity in 13ritain as sharpi. Its chiim 

 to a place in the Britisli List rests, in fact, so far as I know, on a single record. 

 Cameron says : " I have only seen a S taken by Mr. James Hardy at Wouler 

 in iNorthuniberliind," and there are no British rejiresentatives of the species in 

 the British Museum Collections.) 



POSTCRTPT. 



Since writing the above note I have received an interesting letter 

 from Dr. Enslin, to whom I had written enclosing a photograph of the 

 alar neuration in IMr. Peacock's insect. 



He points out what I have discussed at length in my note, but 

 purposely refrained from mentioning when I sent him this photograph, 

 that the cross-nerve in the lanceolate cell of the fore wing shown in it 

 was not, as stated by Cameron in his description of S. sJiai'pi, " oblique," 

 but " perpendicular." Exactly on this ground, if I had not been able to 

 compare Cameron's description with his type, I should have thought it 

 impossible to be sure that Mr. Peacock's capture was really an example 

 of sharpil But, as I have explained, the description is incorrect! The 

 lanceolate cell in the iy\)Q has-a cross-nerve precisely resembling that in 

 Mr. Peacock's insect — i.e., one which cannot properl}' be called "oblique," 

 but is practically "perpendicular." 



Dr. Enslin also makes a suggestion, which I think is highly probable. 

 He thinks it certain that our Northumberland species is identical with 

 an insect hitherto only known from Finland, and described by Forsius 

 (Medd. Soc. pro Fauna et Flora Fennica, 1909-1910) under the name 

 Sahlbergia striithiopteridis. I have looked up this description, and it 

 certainly gives me the impression that there is little, if any, real dif- 

 ference between the Finnish and the North British insects. They seem 

 to agree closely in structure, and also in habitat and time of appearance. 

 The coloration appears to differ slightly, struthiopteridis having more 

 rufescence on the abdomen, entirely black .mandibles, and parts only of 

 the femora and tibiae pale ; whereas in slwrpi the mandibles are largely 

 white, and the femora and tibiae entirely of that colour. If they are 

 not, as seems most probable, mere " local races " of a single species, they 

 must, at any rate (I should think), be closely-related forms, and certainly 

 congeneric ! It seems, therefore, that 1 was prudent in declining to 



