INTRODUCTION 
The present catalogue of the Family Achilixiidae forms Part 5 of Fascicle 
IV of the General Catalogue of the Hemiptera of the World, which is de- 
voted to the Superfamily Fulgoroidea. 
CHARACTERS OF THE FAMILY 
This is the smallest family of the Fulgoroidea, containing only 3 genera 
and 9 species. Most of the species are small or medium sized. Superficially 
they resemble certain genera of the families Cixiidae and Derbidae which 
have steeply tectiform tegmina. Structurally they have many characters in 
common with the family Achilidae, but they differ from the members of this 
family in having {he body greatly compressed, not depressed as in the 
Achilidae. The tegmina of the latter family are typically opaque basad, 
with distinct, usually membranous apical areas which overlap beyond apex 
of scutellum. In the Achilixiidae the tegmina are transparent and steeply 
tectiform. Phylogenetically this family is perhaps closest to the Cixiidae. 
When more material is collected from the East Indies and from Central and 
South America, it may be possible to connect this family with members of 
the cixiid tribe Bennini and perhaps with the families Kinnaridae and 
Meenoplidae. 
In the family Achilixiidae the head is compressed, greatly so in the genus 
Muirilixius, the frons being represented by the contiguous, elevated lateral 
carinae only. Antennae simple, lateral ocelli distinct, pro- and mesonotum 
moderate. Tegulae large. Tegmina usually broad; venation suggestive of the 
tribe Cenchreini. Basal segments of the abdomen with one or two pairs of 
lateral processes. 
CLASSIFICATION ADOPTED 
The classification adopted in the present catalogue is as follows: 
Family ACHILIXIIDAE 
Genus Achilixius Muir 
Genus Bebaioies Muir 
Genus Muirilixius Metcalf 
HISTORICAL RESUME 
This family was established by Muir in 1923 for the genus Achilixius, 
which included Syntames tubulifer Melichar and three new species. The 
following year Muir described the genus Bebaioies for three new species 
from Ecuador. In 1938 the author established the genus Muirilixius for a 
single species from Barro Colorado Island, Canal Zone. 
215 
