PAL/EONTOGRAPHICAL SOCIETY, I92O 



Bolton . Insects of Coal Measures. 



PLA1 



1. PHYLOMYLACRIS. 2-4. S O OMYLACRI S . 5. O RTHOMYLAC RI S. 

 6. ( BLATTOIDEA.) 7. 8. LEPTOB LATTINA. 



J.W. TutcKer, photo 



London Stereoscopic Co imp 



