S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 



33 



Few of the genera appear to be confined to very narrow geological limits excepting those 

 which are poor in species. Mylacris (5 sp.) however is only found in the lower or middle 

 carboniferous series, as is also Necymylacris (2 sp.) and Archyinylacris (2 sp.). Gerablat- 

 tina (12 sp.), Progonoblattina (2 sp.) and Oryctoblattina (1 sp.) are the only European 

 genera not occurring in the dyas and the first of these occurs in the permo-carboniferous 

 of America; but Anthracoblattina (7 sp.), though occurring throughout the range of cock- 

 roaches in the European palaeozoic rocks, has its largest development (5-6 sp.) either in 

 the dyas or in the very highest of the upper carboniferous beds. 



The following table represents the cockroach fauna of the different localities in the 

 j>alaeozoic beds of Europe, the two doubtful species of Weissig being placed in brackets. 



DYAS. 

 Weissig, Saxony. 



Etoblattina flabellata. [Anthracoblattina spectabilis.] 



" weissigensis. " sojiita. 



" carbonaria.] " porrecta. 



Ziebach, near Saarbriicken, Rhenish provinces of Prusssia. 

 Hennatoblattina lebachensis. 



Petrablattina Gracilis. 



Stockheim, Bavaria. 



Anthracoblattina Riickerti. 



CARBONIFEROUS. 



Saarbriicken (immediate vicinity), Rhenish provinces of Prussia. 



Etoblattina priinaeva. Anthracoblattina winteriana. 



" labachensis. Gerablattina intermedia. 



" insignis. " scaberata. 



Hennatoblattina wemmetsweileriensis. 



Saarbriicken (basin). 



Anthracoblattina Renrigii (Cusel, Rhenish 

 Bavaria) . 



Gerablattina weissiana (Bracken, Waldmohr, 

 Rhenish Bavaria). 



Manebach, near Ilmenau, Saxe Weimar. 



Etoblattina didyma. 



" manebachensis. 



Gerablattina Goldenbergi. 



Gerablattina clathrata. 



" Mahri. 



Piwonoblattina Fritschii. 



Weltin-Zidbe) tin, Prussian Saxon}'. 



Etoblattina euglyptica. 



" affinis. 



flabellata. 

 " anthracopbila. 



" Dohrnii. 



" anaglyptica. 



" carbonaria. 



" didyma. 



MEMOIRS BOST. SOC. XAT. HIST. VOIi. Ill 



Etoblattina russoma. 



" leptophlebica. 



" parvula. 



Anthracoblattina spectabilis. 

 Gerablattina Geinitzi. 



" Mtlnsteri. 



" producta. 



" German. 



Oryctoblattina reticulata. 



