Beatles are among the most harmful insects, but one exception in this family is the charming ladybird with seven spots and bright red wing-case.
It is shaped like an egg which has been cut in half length wise. Ladybird is very fond of aphid or greenfly, which attacks roses and is thus a great friend of gardeners and farmers.
Even the eggs of ladybird are deposited on plants so that when the tiny lady birds hatch out, they will feed on the greenfly. The life cycle of lady birds are only just over a month, hence in once season, several generations of ladybirds are born.
Below Ladybirds info from Wikipedia (Read More):-
Coccinellidae is a family of beetles, known variously as ladybirds (British English, Australian English, South African English), ladybugs (North American English) or lady beetles (preferred by some scientists). Lesser-used names include ladyclock, lady cow, and lady fly.[1]
They are small insects, ranging from 1 mm to 10 mm (0.04 to 0.4 inches), and are commonly yellow, orange, or scarlet with small black spots on their wing covers, with black legs, head and antennae. A very large number of species are mostly or entirely black, grey, or brown and may be difficult for non-entomologists to recognize as coccinellids (and, conversely, there are many small beetles that are easily mistaken as such, like tortoise beetles).
http://en.wikipedia.org/wiki/Ladybirds