PHYLOMYLACRIS MANTIDIOIDES. 



Phylomylacris mantidioides (Goldenberg). Plate IX, fig-. 1 ; Text-figure 39. 



125 



1867. Blatta or Blattina, Kirkby, Geol. Mag., vol. iv, p. 388, pi. xvii, figs. 6, 7. 



1877. Blattidium mantidioides, Goldenberg, Fauna Sarsepont. Foss., vol. ii, p. 20. 



1879. Etoblattina mantidioides, Scudder, Mem. Bost. Soc. Nat. Hist,, vol. iii, p. 72, pi. iii, fig. 6. 



1906. {Archimylacridse) mantidioides, Handlirsch, Die Fossilen Insekten, p. 237, pi. xxiv, fig. 27. 



1919. Archseotiphe mantidioides, Pruvost, Faune Contiueut. Terr. Houill. N. France, p. 170. 



Type. — Basal half of left tegmen in nodule; Kirkby Collection, Hancock 

 Museum, Newcastle-on-Tyne. 



Horizon <tu<l Locality.- — Upper Coal Measures (zone of Anthracomya phiUipsii) ; 

 South Hylton, opposite Claxheugh on the Wear, Durham. 



Specific Characters. — Surface of wing coriaceous. Costa] margin convex; 

 subcosta feeble, with few simple branches passing obliquely to the margin. Costal 

 area acutely pyriform. Radius much divided, and occupying outer half of wing- 

 apex Median with numerous divisions, and passing to inner half of wing-apex. 



Fig. W.—Plujlomylacris mantidioides (Goldenberg); diagram of venation of type, a lefl fore-wing, 

 three-and-a-half times natural size. — Upper Coal Measures (zone of Anthracomya phiUipsii) ; South 

 Hylton, opposite Claxheugh on the Wear, Durham. Hancock Mas., Newcastle on-Tyne (Kirkby 

 Coll.). 



Cubitus large, extending to the distal end of the inner margin, and giving off five 

 or more inner branches, the first and third dividing. Anal area tumid, anal furrow 

 well defined. Anal veins 9—10 in number, the first forking twice, and also sending 

 three weak branches forward. Inner margin convex, but less so than costal margin. 



Description. — The surface of the nodule surrounding the wing-fragment is 

 covered with the " spat " or young fry of a species of mollusc to which Kirkby 

 gave the name of Ancyhis vinti, but which I have since shown to be the young fry 

 of Anthracomya phiUipsii ('Trans. Inst. Mining Engin.,' vol. xlix, p. 675, 1915); 

 also Trechmann and Woolacott (' Geol. Mag.' [(3], vol. vi, p. 207, 1010). 



The wing-fragment, measuring 13'5 mm. long and 8 mm. wide, is in excellent 

 condition, and lies with the dorsal surface uppermost. The Avhole of the venation 

 is well marked. Kirkby's original figure is not correct, and his errors have been 

 repeated by Scudder and Goldenberg. Goldenberg did not describe the species he 

 named, and Scudder, to whom we owe the first detailed account, was hindered by 

 the faulty drawing, and does not seem to have seen the specimen. Handlirsch 

 removed the species from Etoblattina, regarding the specimen as an indeterminable 



