Skiploder is correct, my avatar is my Amazon Tree Boa. I don't do venomous, at least not the dangerous ones; Hognose, Mussurana, Mangrove snakes are more my speed. I know I would screw up and get tagged.
The arrow head thing is a myth. Many venomous do have the arrow head shape, especially the vipers, but there are many that do not...
Some of these guys are arguably the most deadly snakes there are, no arrow heads.
King Cobra
http://upload.wikimedia.org/wikipedi...King_Cobra.jpg
Mamba
http://www.freesnake.com/mamba5.jpg
Taipans
http://timesrunningout.welshblogs.co.uk/taipan.jpg
King Browns
http://www.brucemeans.com/around_wor...a_snake500.jpg