Online pictorial key of western Nicrophorus
For those of you in the Western US/Canada with a Nicrophorus in hand, or those who would like to take pictures that will help with species identification, check out this online key.
https://sites.google.com/a/isu.edu/nicrophorus-key/
Note: three pictures are best: 1) top elytral view; 2) pronotum with antennal clubs in focus, 3) side view, with epipleuron and metapimeron in focus.