THE TETTIGIDiE OF GEY LON. 
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stripe extending the whole length of the middle of the dorsum. 
Like several other species it occurs in the rice fields. 
It is. quite likely that the habits of oviposition in the Ceylonese 
Tettigidae are similar to if not identical with those of the same 
group of these Acridians found in North America which are 
treated at some length in my recent monograph (1902). In brief, 
the female makes a burrow in the ground with her ovipositor 
from five to ten millimeters deep. At the bottom of this hole 
she lays her eggs one by one, side by side, fastening them together 
as fast as laid with a glutinous secretion from the vagina. The 
mass finally consists of a variable number of eggs, the whole being 
shaped like a pear, the attenuated extremity of each egg being 
directed upwards. In selecting a site to deposit the eggs, Tettix 
choses vegetable mould or, more frequently still, a spot covered 
with lichens or moss. After oviposition the hole is neatly 
covered with fine particles of soil or vegetation, which the female 
scrapes up by the skillful use of the hind tarsus in some species, 
or by the ovipositor in others. 
Apterous Species and Dimorphism. 
Four apterous species of Tettigidae are here recorded from 
Ceylon : namely, Cladonotus humbertianus , Gladonotus latiramus 
(plate I., fig. 1), Deltonotus tectiformis (plate I., fig. 2), and 
Apterotettix obtusus (plate III., fig. 13). The majority of the 
species possess fully-developed wings which give them excellent 
power of flight. The large number of specimens of long-wing 
forms caught at light in different localities suggest that these forms 
are capable of migration. Among the species represented as being 
caught at light and which doubtless participate in local flights or 
migrations are : Acanthalobus miliarius , Bol., Loxilobus acutus , 
Hanc., Euparatettixpersonatus , Bol., Hedotettix gracilis ,DeHann., 
Tettix atypicalis , Hanc. A number of the species are dimorphic 
in the length of the wings and pronotum. 
Quantitative Variations. 
An insufficient number of specimens prevented extensive 
studies of the species in most cases from the quantitative point of 
view. Yet, in the instance of Hedotettix , even the small series of 
measurements proved of value in leading to the supposition that 
the species that is nominally given here as attenuatus is a recently 
derived species, in that stage of evolution where some individuals 
present gradations connecting it with gracilis . In making the 
measurements of the insects the “ length of body” refers to the 
total distance between the front of the head and the apex of the 
wings or pronotum. Some authors give the length of body as the 
8(25)04 p 
