ODOMATA. 
129 
gregarious insects and it is not uncommon to find large numbers flying 
together over pools in the jungle. The bright winged species of the 
moister areas of Bengal are frequently seen flying in groups, and one 
brilliant yellow species (Rhyothemis variegata F.) is commonly seen 
in Calcutta. Migration has been known to occur elsewhere, though 
not recorded in India. 
The Odonata are by some authors treated as a single family, with 
two divisions and seven sub-families as is done here, or as a sub-order 
with three families, or with seven families. 
Anisopterides 
Zygopterides .. 
r 
LlB'ELIVJLIDZe 
f Corduliinse, 
[ Libellulinse. 
j Gomphinse. 
12 . 
Aeschnibje 
< Cordulegasterinse. 
( Aeschninse. 
3. 
Calo FT EE.YGID.®' 
f Calopteryginse. 
( Agrioninse. 
Anisopterides .—Hindwings broader at the base than the forewings. 
Wings held horizontally outwards from the body when at rest. 
(Figs. 57, 59.) 
Zygopterides .—Wings equal or hindwing small; wings held closed 
together vertically above the body when at rest. (Fig. 58.) 
