unwelcome pest

alright got some unwelcomed pest the first one i saw was like a week ago and was chillin on the top of my plant i didnt know what it was at the time i though it was like a lil rock or something and just right now i saw another one chillin on one of the leaves i took it off and it started moving that when i realized PEST!!!! i had it in my hand and i was gonna take a pic of it to show it here for some help but it flew away they look like lil brown with black marking beattles very small anyone got an idea of what pest im talking about? and what i can use to kill them?

i was looking at the leaf i saw it at and theres no markings of the pest eating it but i dont know... if i see another one ill take a pic of it help please.....

 

any help???
i found another one today and tried to take a pic of it but my cam sucks it just looked like a black dot when i took a pic of it so its useless to post pics of a black dot if some one can help me out before they eat my plan i would apreciate it

 

alright i think i might have the imposter ladybug "Mexican bean beetle" they look a like, but not in their color patterns the 1st one i found was brown with black markings not dots and the one i found today was black with brown markings can they be the same i found them in overgrow
http://www.overgrow.com/growfaq/1205

it also says that ladybugs are beneficial bugs do you recomend getting some and putting them on the plant?