Wikipedia
Ionicus
Joshua Charles Armitage (26 September 1913 – 29 January 1998) was an English illustrator under the pen name Ionicus.
He may be known best for illustrating the covers of Penguin paperback editions of books by P. G. Wodehouse, though he contributed cartoons and drawings to Punch for more than 40 years, and provided cover designs and text illustrations for nearly 400 books in total.