1389.] 355 



Table of Families. 



1 (4) Hind femora formed for running ; elytra and wings in the larva normally 



placed ; insects not stridulating. 



2 (3) Wings when present folded at the middle of the anterior margin ; tarsi 



3-jointed ; cerci horny, forming a forceps I. FoEFicrJLnxffi. 



3 (2) Wings when present folded from the base ; tarsi 5-jointed ; cerci, soft, 



jointed II. BLATTiDiE. 



4 (1) Hind femora formed for jumping; elytra and wings in the larva inverted ; 



insects stridulating. 



5 (6) Antennae short ; stridulating organs situated in the posterior femora and 



anterior portion of the elytra ; ovipositor short III. Aceidiid.ei. 



6 (5) Antennae long ; stridulating organs situated in the anal area of the elytra ; 



ovipositor long, ensiform. 



7 (8) Tarsi 4-jointed IV. LoctrsTmE. 



8 (7) Tarsi 2- or 3-jointed V. Getllid^;. 



I.— FOKFICULIim 



The earwigs, together with the Blattidce, Mantidcs, and Phasmidcs, 

 are distinguished easily from the other three families by the absence 

 of jumping legs, their hind femora being formed for running, while 

 they are separated from the Blattidce, the other British family, by their 

 cerci being developed into forceps, by their peculiarly folded wings, 

 and their three-jointed tarsi. The question as to their value as a 

 Family or Sub-Order need not be discussed here ; but they are now 

 generally regarded as part of the Orthoptera. 



Table of Geneba. 



1 (4) Antennae with 16 — 30 joints. 



2 (3) Elytra and wings fully developed i. Labidura. 



3 (2) Elytra and wings absent ii. Anisolabis. 



4 (1) Antennae with 10 — 15 joints. 



5 (6) Second joint of the tarsi cylindrical; subgenital lamina £ toothed .. 



iii. Labia. 



6 (5) Second joint of the tarsi cordiform ; subgenital lamina $ plain. 



7 (8) Legs of the forceps $ dilated at the base and contiguous there. Wings per- 



fectly developed iv. Forficula. 



8 (7) Legs of the forceps cf not dilated at the base and remote there. Species 



wingless v. Chelidura. 



i— LABIDUEA, Leach. 



This genus has only a single representative here, and only two 

 other species are known in Europe, one from Spain, and the other a 

 doubtful one reported from the crater of Vesuvius. 



GG 2 



