474 SAMUEL II. SCUDDER ON 



scapular and externomedian vein runs parallel to the border, to which, as well as to the 

 mediastinal vein before it terminates, il sends rather distant, oblique veins, besides an in- 

 ferior longitudinal branch, which lias several very distant, inferior, equally longitudinal 

 offshoots. The internomedian vein is wholly longitudinal, and lias few distant branches; 

 these apparently terminate only in the apical holder, while the main anal vein, longitud- 

 inally oblique, extends nearly as far as the mediastinal, and the outer half of the inner 

 margin of the wing seems to have no veins ['ailing on it; the veins of the anal area run 

 obliquely from the margin upward and outward to the main anal vein. 

 The two species known come from the Lower Purbecks of England. 



Blattidium Simyrus. 



PI. 48, fig. 17. 



[Without name] Brodie, Foss. Ins. Engl., 118, PI. 5, fig. 19. 



Blattidium Simyrus Westw., Quart. Journ. Geol. Soc. Lond., x, 390, 396, PI. 18, fig. 33. 



Gryllidium Oweni Westw., Quart. Journ. Geol. Soe. Lond., x, 387, 395, PL 17, fig. 19. 



The figure here given is made up from two specimens, obverse and reverse, of the 

 type of Westwood's B. Simyrus, which Mr. Brodie has kindly .sent me. The mediastinal 

 area is slightly lower than the rest of the wing and the mediastinal vein deeply depressed. 

 The species is peculiar for the fineness and irregularity of the mediastinal nervules, which 

 art ; 'i strong contrast to the distant and regular scapular superior branches, and these in 

 their dire. + <on and brevity to the dozen longitudinal veins belonging to the median series. 

 The anal area i, 'ulcd with oblique transverse veins having the same direction and about 

 the same distance ap..rt as the superior scapular nervules. An inferior marginal vein 

 borders the under surface of the wing. 



Length of fragment, 25 mm.; possible length of the wing, 42 mm.; breadth, 6.5 mm. 

 It comes from the Lower Purbecks of Durdlestone Bay. 



It seems highly probable that Qryllidium Oweni Westw., which conies from the same 

 place and is of the same size, is a specimen of the same species, in which the subordinate 

 nervules of the mediastinal and anal areas are not preserved; the latter are not deline- 

 ated in Westwood's figure of this species. Brodie's PL 5, fig. 19, which Westwoodtook 

 to be the folded hind wing of a cricket, seems also probably to fall here, though it may 

 indicate another species in which the superior scapular branches are as crowded as the 

 mediastinal. 



Blattidium Nogaus. 



Blattidium Noyaus Westw., Quart. Journ. Geol. Soc. Lond. x, 390, 396; PI. 18, fig. 23. 

 I have not seen this species, which has a proportionally much broader mediastinal area, 

 and apparently a smaller number of median veins than the other. The wing could hardly 

 have had the excessive slenderness of the other species, the fragment being 18 mm. long 

 and 7 mm. broad, and the whole wing probably not more than 27 mm. long. It too comes 

 from the lower Purbecks of Durdlestone Bay, England. 



