Odd scaled snakes
Asian slag or snail eating snakes, south indian narrow headed snakes
Vipers
Mudsnakes
Mock vipers, mole snakes, keeled snakes
Diverse group of non venomous mediums sized snakes
over 300 venomous snakes and Emydocephalus (only harmless genus in it)
Colubrids. They make up around 80% of snakes.