INTRODUCTION. 
Part 1 of this Volume contains Canon Fowler’s enumeration of four families of 
Homoptera—the Membracide, Cercopide, Tettigoniide, and Gyponide. The material 
of the Jasside was entrusted several years ago to a well-known Homopterist, who 
volunteered to prepare an account of them for this work. Unfortunately, nothing 
has been finished by him, nor have the specimens been returned to us, in spite of 
repeated applications to that effect. We are therefore compelled to close Volume II. 
as it stands, the concluding portion of Canon Fowler’s contribution having been 
received in 1903. Twenty-five species of Membracide and four of Cercopide have 
since been added by other authors to the Central-American fauna, the Membracide 
mainly by the late G. B. Buckton, either in his ‘Monograph’ (1903) or in a paper 
published in the ‘ Transactions of the Linnean Society’ [Zoology, (2) ix. pp. 329-338, 
pls. 21 & 22 (1905) ], and a list of them is appended on pp. 318-322, with some notes 
by Canon Fowler. For the four families, exclusive of those mentioned in the 
Supplement, 659 species are enumerated, of which 385 are treated as new, with 42 
new genera. Of the twenty-one coloured Plates issued in Volume II., which were all 
drawn and printed by Mr. KE. Wilson, of Cambridge, ten are devoted to the extra- 
ordinary insects belonging to the family Membracide. 
Part 2 of this Volume includes the enumeration of the families Aleurodide and 
Coccide by Professor T, D. A. Cockerell, This section of the subject is separately 
paged and indexed, and it is illustrated by figures in the text. 
Ep. 
April 1909. 
