382 Mr. M. Burr— Notes on the Forficularia. 



badly exposed in all flie specimens. This species, defined by 

 larger size, longer diastema, larger ovate roots of the decol- 

 lated teeth, and relatively less depth of the jaw, is provisionally 

 indicated as Gomphognathus (^Dlastemodon) dimorphodon. 

 The differences from Gomphognathus kannemeyen in the types 

 of premolar teeth conveniently separate G. polyphagus and 

 this species as the subgenus iJidsteniodoji. 



The figure is of the natural size and shows the aspect 

 i'rom above. The specimen is in the South-African Museum, 

 Cape Town. I am indebted to the Trustees for the oppor- 

 tunity of making this further examination of the fossil. 



XLVI. — Notes on the Forficularia. — XIV. A Revision of the 

 Pygidicranina3. 13y MALCOLM liUKK, B.A., F.E.S., 

 F.L.S., F.Z.S., &c. 



Most of the species referred to in the following notes have 

 been hitherto included in the caj)acious genus Pijg idler ana, 

 Serville. An examination of the material in mv own 

 collection, with a view to revising the somewhat arl)itrary 

 arrangement of de Bormans, has induced me to establish 

 some new genera, based chiefly on characters which have not 

 hitherto been employed in this genus. 



The group-name was invented by VerhoeflP, who divided it 

 into Pygidicraninte for the type genus and Pyragrinai for 

 Pyragra^ Echinosoma, and perhaps Echinopsa!is. These last 

 genera are not discussed in these pages. They represent the 

 transition towards Labidura. The femora are neither com- 

 pressed nor keeled, the elytra are stronger at the axillary 

 angle, and consequently the scutellum is only present as an 

 exception in Pyragra and never in the other genera, in which 

 the pronotum extends well over the insertion of the elytra. 

 Pyragra is in many respects undoubtedly allied to Pygidi- 

 crana^ but Echinosoma shows the transition through Eckino- 

 2>salis to Psalis, Labidura, and Anisolabis. 



In the Pyragrinai the pronotum is always transverse, in 

 the Pygidicraninse never. 



An important generic character, which will be of un- 

 doubted use in the future, is tlie form of the sternal plates *, 

 especially of the lobe of the raetasternum. 



* The value of these shields as a generic character was appreciated by 

 Scudder in 1876, though he failed to make very much use of them. 



