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"'''''Latrodectus mactans''''', the '''(southern) Black widow''', is a highly venomous species of spider in the genus Latrodectus. They are well known for the distinctive black and red coloring of the female of the species and for the fact that she will occasionally eat her mate after reproduction. The species is native to the United States of America and Mexico. The female black widow's venom is particularly harmful to humans (males almost never bite humans). The injection of venom from these species is a comparatively dangerous or lethal bite." ([http://en.wikipedia.org/wiki/Latrodectus_mactans Wikipedia])

'''''NEUTRAL DENSITY POINT'''''<br />