96 FOSSIL INSECTS OF THE BRITISH COAL MEASURES. 



Family Mylacrid^. 



Genera Hemhnylacris, Phylomylacris, Trilophomylacris, Soomylacris, Lithomylacris, Orthomylacris, 

 Stenomylacris. 

 Family Poroblattinimi. 



Genus Premnoblatta. 



This classification seems to accord most nearly with recent discoveries, and is 

 therefore adopted here. 



Family Archimylacjupi:, Handlirsch. 



Body slender in primitive forms, broadened out in more specialised types. 

 Cerci well developed and jointed. Legs slender and armed with spines. Antenna 1 

 slender. Pronotnm snbcircnlar. Subcosta distinct, with pectinate or equally 

 spaced branches. Radius well branched, with or without radial sector. Median 

 of one or two main branches. Radius, radial sector and median with outward 

 branches only. Cubitus inwardly curved, and with inward branches. Anal 

 furrow present. Anal area large, extending beyond the basal third of the wing. 

 Interstitial neuration of straight nervures, or an irregular reticulation, or the two 

 combined. 



The greater number of Palaeozoic Blattoids belong to this family, which is 

 united to the Palaeodietyoptera by transitional forms. 



Genus APHTHOROBLATTINA, Handlirsch. 



1906. Aphthoroblattina, Handlirsch, Proc. U.S. National Museum, vol. xxix. p. 719. and Die Fossilen 

 Insekten, p. 183. 



Generic Characters. — Tegmina two-and-a-half times as long as wide, with 

 convex outer margin. Costal area narrow and strap-shaped. Subcosta extending 

 over two-thirds the wing-length. Radius giving off radial sector near middle of 

 wing, and sending a few simple branches to the apex. Radial sector forking into 

 four or six branches. Median small, with few branches directed inwardly. 

 Cubitus giving off 7 — 8 branches along its whole length, and extending well out 

 towards the wing-apex. Anal area small. 



Aphthoroblattina johnsoni (Woodward). Plate VI, figs. I. :» ; Text-figures 30, 31 . 



1887. Etoblattina johnsoni, Woodward, Geol. Mag. [3], vol. iv, p. 53. pi. ii. figs. 1 a, 1 h. 

 1906. Aphthoroblattina, Handlirsch, Die Fossilen Insekten, p. 183. 



Type. — The pronotnm and tegmina in an inverted position with traces of hind- 

 wings on a small ironstone nodule, in counterpart; British Museum (Johnson 

 Collection, no. I. 1067). 



