100 
SPOLIA ZEYLANICA. 
Second Division. —In the miliarius group (plate I. figs. 8-8&) 
the stature is larger, the antennae shorter, the head and eyes not at 
all elevated, the spine of the lateral lobes distinctly obliquely 
directed backward. Genus Acanthalobus , Hanc. 
Third Division. —On the other hand, in L. acutus group (plate I., 
fig. 3, and plate III., figs. 16-16&) the body is moderately small, 
the facial frontal costa roundly produced before the eyes, the 
posterior angle of the lateral lobes only a little acute produced or 
obliquely excised. Genus Loxilobus , Hanc. 
There is some doubt as to whether the latter genus should not 
be placed in the section Metrodorince instead of the Scelimenince. 
It became necessary also to create a new genus to include 
Paratettix personatus , Bol., together with another new species 
under the name Euparatettix. 
Extremes op Structural Modifications. 
This group presents an interesting array of remarkable species, 
some of which are grotesque in the form of the body. The 
individual variations, the gradation of forms, the slight differences 
sometimes existing between the groups, the cha nge of form incident 
to isolation on the one side, and wide distribution on the other, offer 
exceedingly difficult obstacles in the way of systematic arrange¬ 
ment. This difficulty is relieved in a measure by the accompanying- 
drawings which help to elucidate the descriptions. The diversified 
forms of body development suggest intense struggle for existence, 
and among them, moreover, is admirably exhibited an exquisite 
adaptation, especially in the direction of protective resemblance. 
In the instance Scelimena gavialis> De Sauss., the combination of 
vivid red and dark fuscous is exceptional among the Tettigidse. 
The richness of genera contrasts quite markedly with the compara¬ 
tive paucity of forms found in more temperate regions of the 
world. A contrast also will be discovered in comparing the highly 
specialized tropical forms with the simple types observed in 
northerly latitudes. 
Habits in General. 
The habits of some of the species are correspondingly singular 
in some respects, as might be inferred from the anatomical 
structures; notably the remarkable species G-avialidium crocodilus 
shown in plate II., fig. 11, with its flattened prolongate body. 
It closely imitates the rough sculpturing of excoriate moss- 
covered rocks over which water constantly trickles. The insect is 
so secure in its resemblance to the rocks and is made so confident 
by its adaptation that it acts very sluggish, seldom taking to its 
wings. According to observations of Mr. E. Ernest Green (1902, 
