VI Introduction 



will cause no great inconvenience to the reader. Dr. Metcalf himself 

 advocated it under certain conditions, and it is felt that its use would 

 have met with his approval. 



Under the sj'stem used here, and to be used for subsequent por- 

 tions of the Cicadelloidea catalogue, the literature references are 

 cited by author, year, and key letter, e.g. Fabricius 1802a. The 

 full reference can be obtained by consulting the Bibliography of the 

 Cicadelloidea in which authors are arranged alphabetically, and their 

 works chronologically under the author's name. This method of 

 citation eliminates the necessity for a complete literature citation 

 in the catalogue proper. 



The Family Ledridae consists of 52 genera and 294 species. This 

 family may be characterized as follows : 



The species vary in length from 5 mm. to 30 mm. The head is 

 usually somewhat flattened and is often spatulate. The ocelli are 

 located on or near the disc of the crown, not near the eyes nor the 

 anterior margin of the crown. The clypeus is elongate and the 

 transclypeal sulcus distinct. The clypellus is very small, not much 

 broader basally than at the apex. The genae are not strongly ex- 

 panded laterally. The forewings often have a reticulate venation, 

 and may or may not have an appendix. The pronotum is usuall}^ 

 declivous anteriorly. The hind tibiae bear paired apical macrosetae 

 and a preapical macroseta. The hind tibiae have at least some of 

 the macrosetae occurring on protuberant bases. 



The following classification has been adopted for this family: 



Family Ledridae 1 



Subfamily Ledrinae 7 



Tribe Ledrini 8 



Tribe Xerophloeini 42 



Tribe Petalocephalini 58 



Subfamily Stenocotinae 110 



Subfamily Koebeliinae 120 



Tribe Koebeliini 121 



Tribe Thymbrini 123 



Two of the species in the present catalogue have a distribution 

 covering two or more zoogeographic regions, and one species is from 

 an unlaiown locality. The other species are recorded as follows: 

 16 from the Nearctic Region, one from the Caribbean Region, 16 

 from the Neotropical Region, 47 from the Palearctic Region, 22 

 from the Ethiopian Region, 58 from the Oriental Region, 34 from 

 the Malaysian Region, 2 from the Austromala3^an Region, 88 from 

 the Australian Region, and 7 from the Maorian Region. 



