LIST OF PLATES IN VOLUME XX. 



I- — XI. Photogi-aphs from the Sahara., taken liy E. Hartert. 

 XII. Map of the Algerian Sahara. By E, and 01. Hartert. 



XIII. ^ 



' Sijntomidae. By Horace Knight. 

 XIV.J 



XV. Ilijmenoptcra, from photographs by F. D. Morice. 



The Parts of this Volume were issued as follows : 



No. 1, containing pages 1 — 256 and Plates I. — XII., i.ssued February 2-ith, 11)13. 



No. 2, containing pages 257 — 472, issued June 17th, 11)13. 



No. 3, containing pages 473—615 and Plates XII!.— XV., issued Octoljer 21st, 1913. 



No. 4, containing p.ages G17 — 656, issued February 1914. 



