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MEMBRA ClDJE. 
SPIREROCENTRUS CURVIDENS (var?) 
(Plate LYI. fig. 5). 
Pronotum hirsute on the back. Tegmina dull ferruginous, mottled with fuscous, 
and with transverse, clear apical areas. Legs ferruginous. 
Drawn from an example obligingly lent by Canon Fowler, and labelled 
S. curvidens. 
The suprahumerals are short and inconspicuous, and the frons is very pilose. 
Posterior horn shorter than the tegmina. 
Size, 7x4 mm. 
Habitat .—San Geronimo. 
SPIRE ROCENTRUS LTJTEUS, n.s. (?) 
(Plate LYI. figs. G, Ga.) 
Robust. Suprahumerals small and inconspicuous. The pronotum tumid, and 
ending in a stout posterior and curved horn with a nodular swelling below, continued 
as a fine crooked process as long as the tegmina. Surface rough and coarsely 
punctured all over the metopidium. Tegmina paler and obscurely veined. 
Size, 7x4 mm. 
Habitat. —Adelaide, S. Australia. 
Although the above habitat is so remote from America there seems to be good 
reason for placing this species in the above genus, though we know nothing of the 
life-history of the insect. External morphology of the adult is but a small portion of 
an insect’s history, but the classifier must be content with such materials as fall into 
his hands. Biology ranges over a wide field, but it is obvious that identification of 
an insect is necessary before its habits and functions can be discussed. 
The important question of distribution of species over the world cannot here be 
conveniently argued, but it rises when we consider the remarkable paucity of species 
of Membracidai over the whole Continent of Europe. The species next to follow in 
description relates to one of the only two species hitherto discovered in England, 
though other authors have named several which appear to be varieties only of the 
above. 
Mr. Kirby in his preliminary list of Centrotin® above referred to, notes twelve 
species of Centrotus as named by Walker in the British Museum, and he heads this list 
with the European Centrotus cornutus of Linnaeus, or more exactly so fixed by Eabricius. 
I have often taken the node on the undersurface of the posterior horn as a convenient 
character for many insects, yet I am disinclined to separate so old a type from its well- 
known generic name of Centrotus cornutus , for it would meet with many objectors. 
