PREFACK, VU 



by swollen antennse, for which they have proposed the 

 name Paidium. They likewise refer to the Thysanura 

 two doubtful species, for which they have proposed 

 two new genera, Acreagus and Glessaria. The lattei' 

 has been regarded by some as a neuropterous, by 

 others as a coleopterous, larva; while Acreagus has 

 been referred by some to the Hemiptera, a view in 

 which I am disposed to concur. 



Whatever shortcomings may be found in this work, 

 and while no one can be more sensible of them than 

 myself, I believe that the plates must meet -with 

 general approval. Of the anatomical drawings, indeed, 

 which were mostly made by myself with the aid of the 

 camera lucida, I will say no more than that I believe 

 they will be found to be correct ; but the representations 

 of the species, and the general execution of the plates, 

 are the work of Mr. Hollick, a gentleman who is unfor- 

 tunately deaf and dumb, but in whom these terrible 

 disadvantages have been overcome by natural genius. 

 I believe this is the first work which has ever been 

 illustrated by a deaf and dumb artist. It will be seen 

 that Mr. Hollick has spared himself no labour or pains. 

 I feel much indebted to him for the conscientiousness 

 with which he has reproduced the minute details of the 

 originals, as well as for the beauty and accuracy of his 

 work. 



High Elms, Down, Kent; 

 ISth March. 1872. 



