16 Elementary Manual of Zoology. 
can easily be distinguished by their long thread-like antenne. hey 
are generally much more slender in general build, and have a pair 
of easily seen auditory organs, which are situated at the upper ends 
of the front tibize, while the corresponding organs in the Acridide 
‘are situated on the metathorax. Like other Saltatoria, the Locustide 
are able to produce chirping sounds. ‘These are often so loud as to 
make the forest resound, especially in the rainy season. The sound 
is produced by scraping the bases of the front wings together. Some 
of the species are said to prey upon other insects, but, generally 
speaking, they are vegetable feeders. They lay their eggs either in 
the tissues of plants or in the earth. The Locustide have not been 
recorded as doing any special damage in forests, but they should be 
noticed on account of the well-known sounds they produce. The 
students should sketch one or two representative specimens from the 
collection. in their note-books. 
Gryllide.—This group includes the house-crickets and the mole 
crickets. The Gryllide are closely allied to the Locustide and have 
much the same long filiform antenne ; they can be distinguished from 
the Locustide, however, by their horizentally set front spre, As in 
the case of the Locustide, many of the specics produce loud chirpings. 
The mole-crickets have their front legs thickened and broadened for 
‘burrowing in the earth. They feed chiefly on vegetation, and have 
been reported in some cases as causing a good deal of damage to 
crops. The studerts should sketch one or two typical specimens from 
the Museurn collection. 
Termitida (White-ants).—The winged individuals of these destructive 
creatures differ from the corresponding form in the preceding groups 
in having the front pair of wings membranous, and almost entirely 
similar in structure to the hind wings. White-ants live together in 
communities, which consist of — 
(1) A female or queen, with enormously distended abdomen ; 
she is incapable of locomotion and lays all the eggs. 
(2) Small ant-like neuters, which may be compared to the 
worker bees: they are of two kinds, ozz., individuals with 
large heads and sharp mandibles, to defend the nest, and 
individuals with small heads, to build the passages and 
nest, collect the food and do all the work of the community. 
(8) Wingless larve, which develop into winged males and 
females, 
(4) Winged males and females. The males and females fly out 
of the nest in clouds, generally after rain. Those of 
them that escape their numerous enemies are said to drop 
their wings and copulate. The female either finds her 
