14 BRITISH ORTHOPTKRA. 



Labiinse). The Labiduridse contain Anlsolabis 

 lipes (sub-family Psalinae) and Labidura riparia (sub- 

 family Labidurinae). The Forficulidre contain the 

 other three species- -Forficnla auricularia, F. lemei> 

 and Apterygida albipennis (all in sub-family Forncu- 

 linse). Of these A. annulipes and P. arachidis are not 

 natives of Britain. There is little likelihood of the list of 

 indigenous species being increased, though Chelidurella 

 acanthopygia Gene may perhaps turn out to be British. 

 It should be sought for under stones on hills and moun- 

 tains.* The South-west of Ireland might possibly also 

 yield something new if it were thoroughly explored, 



Females of Prolabia aracliidis, Apterygida albipennis, 

 and Forficnla, lesnei are very much alike; but the males 

 and remaining females may be easily separated with 

 the help of the following artificial table :- 



A. Males without flattened hase to callipers. 



a. Elytra and wings present. 



i. Size very large ; colour pale 



ochreous . . . L riparia. 



ii. Size very small; colour dark 



brown . . . L. minor. 



b. Elytra present, wings absent ; 



size moderate; colour brown. 

 i. Tooth near apex of calli- 

 pers of male . . .P. arachidis. 

 ii. Tooth near middle of calli- 

 pers of male . . A. albipenms. 



c. Elytra and wings absent. 



i. Colour black; right branch 

 of callipers of male more 

 curved than left . . A. annulipes. 



B. Males with flattened base to callipers. 



a. Size moderate ; colour brown. 



i. Elytra and wings present . F. auricular ia+ 

 ii. Elytra present ; wings ab- 

 sent . . . F. lesnei. 



* M. Burr, ' Entomologist/ vol. xxxi, 1898, pi. ii, p. 125. Notes on the 

 insect are given, and both male and female are figured on a large scale. 



