part 1] AECIIIMYLACRIS PRINGLEI. 23 



3. A New Species of Blattoid (Aechimtlaceis) from tlie 

 Keele GrEOUP (IIadstockian") o/Sheopshiee. BjHeebeet 

 BoLTOJs-, M.Sc, F.R.S.E., F.G.S. (Read February 2nd, 

 1921.) 



[Plate I.] 



I AM indebted to the Geological Survey for the opportunity 

 of examining a fragment of an insect-wing discovered by 

 Mr. J. Pringle, F.G.S., while engaged in the examination of core- 

 material collected in 1919 by Mr. T. C. CantriU, B.Sc, F.G.S., 

 from a new borehole for water at Slang Lane, Wellington 

 (Shropshire).^ 



The core-material came from some level between the surface 

 and 97 feet, the actual depth being undeterminable because the 

 chisel was used in boring. From an examination of the plant- 

 remains, Mr. Pringle is of opinion, and Mr. Cantrill's field- 

 observations bear him out, that the beds belong to the Keele Group. 



The wing-fragment and its impression lie upon the surfaces of 

 two pieces of red marl, and are not easily recognizable. Its 

 discovery by Mr. Pringle is testimony to the thoroughness of his 

 search of the m.aterial. 



Enough of the wing is present to enable us to determine the 

 genus, and to show that the form is new to British Coal Measures, 

 and sufficiently distinct from Continental species to merit specific 

 distinction. The characters of the subcosta and the interstitial 

 neuration clearly indicate that the wing belongs to the genus 

 Archimylacris, and as such I describe it. 



Aechimtlaceis PEiNGLEi, sp. nov. 



Holotype. — The basal two-thirds, and impression of a tegmen 

 or forewing, lying upon the irregular surface of two small pieces of 

 red marl, and partly obscured by plant-remains. Length = 18 mm. 

 Collection of the Geological Survey, Jermyn Street, Reg. Nos. 

 30725-726. 



Horizon and locality. — Keele Group, Upper Division of the 

 Coal Measures ; from rocks between the surface-level and 97 feet 

 in the borehole at Slang Lane, Wellington (Shropshire). 



Specific description. — Wing twice, or two and a half times, 

 as long as wide. Outer margin flatly curved ; subcosta strap- 

 shaped, and giving off numerous parallel branches to the outer 

 margin. Radius dividing just beyond the middle of the wing, and 

 giving off a radial sector. Median parallel to the radius, and 



I < 



Summary of Progress for 1919 ' Mem. Geol. Surv. 1920, p. 8. 



