Fauna and Stratigraphy of the Storm'bcrg Series. 



331 



ORDER PLECTOPTERA. 

 FAM. EPHEMERIDAE. 



PHTHARTUS AFRICANUS, sp. nov. 

 Text fig. 2. 



This is represented by several imperfect larvae of which the 

 specimen figured (Cat. No. 5732) is nearly complete, lacking the 

 head and lateral appendages. The cereal setae are faintly indi- 

 cated - and have been drawn in on the evidence of a second spec- 

 imen (No. 5733) consisting of the hinder portion of an abdomen in 

 which the long setae are well-marked. 



As preserved, the body without the cerci is 15 mm. long and 

 3'5 mm. broad in the middle. 



Fig. 2. PJithartus o/nccmus, Htn. 



The earliest Ephemerid larvae belong to the genus Phthartus 

 Handl. from the Permian of Russia. The present form seems fairly 

 similar to that genus, but the cerci an 1 shorter and stonier. It may 

 be grouped provisionally as Phthartus africanus sp. nov. 



Tijpe. Impression on shale S. Afr. Mus. Cat, No. 5732. 



Locality. Road-cutting, Siberia, "Wodehouse, C. I'. 



Horizon. Shale-band near base of Cave Sandstone. 



ORDER ORTHOPTERA. 



FAM. MESOBLATTINIDAE, Handl. 



STRIATOTEGMEN AFRICANUM, gen. et sp. nov. 



Text fig. 3. 



Tillyard's emendation of the characters of this family runs as 

 follows: - "Subcosta much reduced. Radial area extensive and 

 strongly developed, sending numerous branches towards the anterior 



