Nothing from Serial Monitor with Beetle

Hi

I just bought a bunch of Beetles for a project. However, I couldn't seem to get anything to show on the Serial Monitor. Everything else seems to work fine. Codes that make use of analog readings work etc. The only problem is nothing shows up on the Serial Monitor.

I tried uploading this very simple code but nothing appears:

[code]void setup()
{
Serial.begin(9600);
}

void loop()
{
Serial.println("hello");
delay(300);
}[/code]

Is there a problem with my beetles? This happened to all 4 beetles that I ordered by the way :(