( clvi ) 



Fig. 26. Leg of Listropodia blasii Kolen. (1856). 

 ,, 27. ,, Colpocephalum truncatum Piag. (18S0). 

 ,, 28. ,, Hesperoctenes. 

 „ 29. „ Adroctenes horvatki Jord. (1910). 

 ,, 30. ,, Loxaspis mirandus Roths. (1912). 



accidental, but must be assumed to be due to the similarity 

 of surroundings. 



From the various examples of resemblances I have men- 

 tioned, it is evident that the medium in which a species exists 

 exercises a most powerful influence on its evolution. If that 

 is so in the case of Epizoic insects, we are not far wrong in 

 assuming that the similarities, often slight in themselves, 

 which sympatric insects (i. e. insects living in the same 

 district) exhibit, are due in the first instance to similarity in 

 the surrounding primary conditions of life. 



It only remains for me to express my thanks to the 

 Officers and Council for the assistance which they have given 

 me during my term of office, and especially to the Vice- 

 Presidents, on whom, through unfortunate necessity, so large 

 a portion of my work has latterly devolved. 



