32 



case, which remains attached to the female by a membrane 

 connected with the subgenital valvules or plate until containing 

 the normal number of ova fixed for each species. Although of 

 similar type, specific or generic differences appear to be devel- 

 oped, but our knowledge in this direction is still very meagre. 

 The cases are very elastic, and consist of a double row of cells, 

 each with one egg ; they are marked laterally by slight furrows, 

 and the keel above by notches, crenulations, or teeth ; the cells 

 open valvularly to permit the escape of the young when hatched, 

 but close again and appear intact. 



SYNOPSIS OF FAMILIES. 



1. Femora spined. 



2. Abdomen of female with last segment large, flat ; subgenital 

 lamina obsolete. 



3. Supra-anal lamina of both sexes very narrow, transverse. 

 Wings, when developed, with an apical triangular area. 



I. EcTOBIDiE. 



3.3. Supra anal lamina more or less produced, triangular, 

 incised, or lobed. Wings without apical triangular area. 



II. PHYLLODROMIDiE. 



4.4. Supra-anal lamina of male more or less quadrate, of female 

 incised, lobes rotundate or broadly rounded and entire. Cerci 

 scarcely as long as lamina, or very little exceeding the same. 



5. Body flat, or moderately convex. Males winged, females 

 wingless. Fore legs gressorial, fore tibia? clavate, spines in double 

 series. Supra-anal lamina of male more or less quadrate, of 

 female incised, lobes rotundate, or rarely entire. Cerci long, 

 articulate. III. Epilamprid^e. 



5.5. Body thick, broad. Both sexes wingless. Fore legs 

 fossorial, fore tibia? flat, spines palmate, in single series. Supra- 

 anal lamina of both sexes broadly rotundate, entire. Cerci very 

 short, joints indistinct. IV. Geoscapheusid^, fam. no v. 



2.2. Abdomen of female with free valvules, or these rarely 

 united by a suture. V. Periplaxetid^. 



a. Cerci as long as supra-anal lamina, or scarcely longer. Elytra none, 

 or lobiform. Pglyzosterix.^:. 



h. Cerci much longer than lamina. Elytra perfect or rudimentary, 

 rarely lobiform or absent. Periplanetix.^:. 



1.1. Femora not spined, or rarely only the anterior ones. 



2. Claws with arolia (excepting the females of Heterogamidse). 



3. Forepart of wings rounded, or with plicate apical triangular 

 area. VI. Chorisoxeurid^. 



3.3. Forepart of wings rounded, without triangular apical 

 area. 



4. Wings with anal area flabellate. Pronotum glabrous (except 

 in some species of Derocalymma and Perisi^haeria.) 



