'.)<; FOSSIL INSECTS OF THE BRITISH COAL MEASURES. 



Family MYT..U'KID.T:. 



Genera Heminiylacris, Phylomylacris, Trilopltomylacris, Soomylacris, Lithomylacrls, Orthoinylacris, 

 Stenomylacris. 



Family POROBLATTINID^,. 



G-enus Pri-iiui'ililnttn. 



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

 therefore adopted here. 



Kamily ABCHIMYLACRID.S, Handlirsch. 



I5ody slender in primitive forms, broadened out in more specialised types. 

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

 slender. Pronoturn snbcircular. Snbcosta distinct, with pectinate or equallv 

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

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

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

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

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

 combined. 



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

 united to the Palaeodictyoptera by transitional forms. 



Genus APHTHOROBLATTINA, Handlirsch. 



1906. AjiJi//ini-ii!ilnl/iini, Handlirsrli. Proc. U.S. National Museum, vol. xxix. \>. 710, and I>ie Fossileii 

 Insekteu, p. IS:!. 



Generic < '//^/v/r/r/v--. Tegiiiiua two-and-a-half times as long as wide, with 

 convex outer margin. Costal area narrow and strap-shaped. Snbcosta 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 ^ branches alono- its whole length, and extending well out 



O O O ' ' ^ 



towards the wing-apex. Anal area small. 



Aphthoroblattina johnsoni (Woodward). I'late YLligs. t,5; Text-fignres 30, 31 . 



1-t/tiltltillinti jiiliiixniii. \V 01 id ward, (Iml. Mai:. ''' vol. iv. p. ">:!. |>l. il, li^s. 1 c. 1 I'. 

 HUH;. Aphthoroblaltina, Handlirsch, l>ir Kossilm lns.-lj<'ii, ].. is:!. 



I'. The pronotum and tegmina in an inverted position with traces o| hind- 

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

 Collection, no. I. Ki;7). 



