THE BULLETIN OF THE BRITISH MUSEUM 
(NATURAL HISTORY), instituted im 1949, %s 
issued in five series corresponding to the Departments 
of the Museum, and an Historical series. 
Parts will appear at regular intervals as they 
become ready. Volumes will contain about three or 
four hundred pages, and will not necessarily be 
completed within one calendar year. 
In 1965 a separate supplementary series of longer 
papers was instituted, numbered serially for each 
Department. 
This paper is Supplement 20 of the Entomological 
series. The abbreviated titles of periodicals cited 
follow those of the World List of Scientific Periodicals. 
World List abbreviation 
Bull. Br. Mus. nat. Hist. (Ent.). Suppl. 
© Trustees of the British Museum (Natural History), 1973 
TRUSTEES OF 
THE BRITISH MUSEUM (NATURAL HISTORY) 
Issued 18 October, 1973 Price £12.30 
