Explanation of Plate N 



67. Vespa germanica. 



70. Formica fusca. 



71. Myrmica ruginodis. 



72. Lasius niger. 



73. Ichthyurus pachygaster. 



74. Cossus cossus (key to organs of Lepidoptera). 



75. Dytiscus marginalis (leg of the beetle). 



Figures c and 75 are magnified x 7. Figures k, 23, 36, 67, 68, 

 69, 74 X 10. Figures h, j, I, 25, 29, 30, 35 and 45 x 15. Figures 

 o, p, 10, 14, 15, 21, 24, 26, 28, 32, 38, 47, 49, 58 x 20. Figures 

 r, s, 44, 50, 57, X 25. All the other figures are magnified X 30, 



