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



badly exposed in all the 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 (JDiastemodori) dimorphodon. 

 The differences from Gomphognathus kannemeyeri'm the types 

 of premolar teeth conveniently separate G. polyphagia and 

 this species as the subgenus Diastemodon. 



The figure is of the natural size and shows the aspect 

 from above. The specimen is in the South-African Museum, 

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

 tunity of making this farther examination of the fossil. 



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

 Pygidicraninae. By .Malcolm Burr, P. A., F.E.S., 

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



Most of the species referred to in the following notes have 

 been hitherto included in the capacious genus Pygidicrana, 

 Serville. An examination of the material in my own 

 collection, with a view to revising the somewhat arbitrary 

 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 Verhoeff, who divided it 

 into Pygidicraninae for the type genus and Pyragrinae for 

 Pyragra, Echinosoma, and perhaps Echinopsa is. These last 

 «renera 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 Echino- 

 psalis to Psa/is, Labidura, and Anisolabis. 



In the Pyragrinae the pronotum is always transverse, in 

 the Pygidicraninae never. 



An important generic character, which will be of un- 

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

 especially of the lobe of the metasternum. 



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

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



