MEMBRA ClDJE. 
85 
the pronotum is one of the chief characteristics of the Membracidse; yet, here, as in 
other cases, the extraordinary development of the dorsal process makes this rule 
nugatory. The variations of U. orozimbo are chiefly restricted to the male insects. 
The figure given is a male from the British National Collection, and is reported 
from Mexico. 
Expanse, 28 mm. 
Size, 9 mm. Height, 15 mm. 
UMBONIA MEDIA, Walk. 
(Plate XYI. figs. 3, 3a.) 
Walker, Physoplia media, l.c. p. 516. 
Colour green or } r ellowish-green; pronotal horn very broad, flat on the top, and 
cut off at an angle; a red stripe extends from the hinder point of the horn to the 
dorsum. Pronotal surface punctured ; legs reddish ; tegmina with pale neuration in 
high relief of the membrane. 
According to Stal this insect is the male of U. orozimbo. 
Size, 12 x 14 mm. 
Habitat. —Mexico. 
B.M. Collection. 
UMBONIA OROZIMBO, Fairm. 
Fairm. l.c. p. 277, plate vi. fig. 2. Fowler, B.O.A. p. 36, Tab. III. figs. 15 to 20a. 
Canon Fowler remarks that this is an extraordinary variable species, and that a 
right idea can be formed of it only after a careful examination of a long series. 
The females vary in size, in colour, and in the form of the great dorsal horn, but 
these variations are much more pronounced in the males of the species. The contrast 
between the sexes are such as led Amyot and Serville to represent the dark males 
with their greatly developed dorsal horns as members of a new genus, Physoplia. 
Fowler examined numerous examples, and in every case these enormous horns proved 
to be the developments of male insects. Thus Physoplia no longer should exist 
as a genus of Membracid®. 
But the males also differ amongst themselves as to size. Those inhabiting 
El Beposo and Tole in Panama are small, and show but little difference of form from 
the females of that locality, whilst Physoplia nigrata (Amyot) and P. crassicornis 
of Florida and Brazil are large, and have a totally different aspect from the females 
represented by U. orozimbo. These latter insects are common in North and Central 
America. 
