THK ORTHOPTERA OF HOLLAND, IJELUIUM, AND ENCiLANU. 117 



me that prol)abl3' it was the pale ivorn males the birds were picking 

 oft", because these would be much more conspicuous than the females 

 (probably freshly emerged), and even than the fresh males, and as 

 these worn males had almost certainly fulfilled the purpose of their 

 existence by the time they had got so worn, their loss to the species 

 would be unimportant. I would also point out that because two 

 species of birds have been seen to feed on A. corydon, it does not 

 follow that it is an acceptable morsel to avian palates in general. 

 The cuckoo is said to eat many kinds of hairy and otherwise un- 

 attractive caterpillars, which have been proved to be distasteful by 

 their rejection by many other species. 



Such are the ideas which have occurred to me on the colours of 

 " blue " butterflies, and if the editor thinks them worth printing, I 

 shall be quite prepared to find most of them ruthlessly slaughtered in 

 succeeding numbers of the " Record.'' If, however, anj- one of them 

 should turn out to be not entirely drivel, and should lead to good 

 results in abler minds, I shall feel I have not penned them in vain. 



The Orthoptera of Holland, Belgium and England. 



By MALCOLM BURR, B.A., F.L.S., F.E.S., F.Z.S., etc. 



One of the last publications from the pen of the late Baron de 

 Selys-Longchamps, was the interesting little article (Ann. Snc. Knt. 

 Belli., xliii., 1899, pp. 447-451) comparing the Orthoptera Fauna of 

 Belgium, England and Holland. His authority for the Belgian list 

 was his own work ; for the English list, the little book by the writer 

 of this note, and for Holland, a paper entitled " Orthoptera neerlandica," 

 published at Utrecht in 1899, by Mr. Tiddo Polmer. Disregarding 

 accidental stragglers and introduced species, the author accounted for 

 36 British, 43 Belgian, and 31 Dutch species of truly indigenous 

 Orthoptera. The Dutch list has recently been revised by Dr. H. W. 

 Van der Weele of the Leyden Museum (" Voorloopige Lijst der in 

 Nederland waargenomen Orthoptera," Tijdschrift rnur l-hitdninlntjie, L, 

 1907, pp. 129-139). It is not without interest to note a few points 

 concerning some of the species mentioned in this list. 



Dermaptera. — The earwigs are not referred to in either of the 

 Dutch lists, but it is probable that, in addition to the two common 

 species, Forficula lexnei, Finot, will be discovered in Holland and also 

 in Belgium, but it is doubtful whether Labidiira riparia, Pall., is 

 indigenous to either country. Chelidurella acant/iopj/fiio, Gene, is far 

 from rare in Belgium, but it remains to be discovered in Great Britain. 

 I have referred to this species as a probable future addition to our list 

 in an earlier paper [Entom., vol. xxxi., p. 125, 1898). Apferi/i/ula 

 alhipennis, Meg., is now known to be numerous in certain localities in 

 our eastern counties ; it was recorded from Holland by Snellen van 

 Vollenhoven, in 1846, and is locally distributed in Belgium. 



DrcTYOPTERA. — -Blattodea I The three British species of Ectobia 

 occur also in Belgium and Holland, and there is little or no chance of 

 anynewdiscoveriesinthegroupinanyof thethreecountries. Mantodea: 

 Mantis reb'tjinsa, L., is recorded as an accidental visitor to Belgium. Its 

 distribution extends as far north as Fontainebleau. 



Orthoptera. — Acridiodea : i[fecostethiis f/rnssus, L., is indigenous to 

 all these countries, Stetiobot/irua Uneatus, Panz,, is not recorded by 



