Butterfly chrysalis - probably a Variable Checkerspot (Euphydryas chalcedona)

This is another photo of the chrysalis I found on a shrub of native Bitter Gooseberry (Ribes amarum, Grossulariaceae) by the creek. See this photo and this one. I first thought it might be a Common Buckeye (Junonia coenia), but it's probably another Variable Checkerspot (Euphydryas chalcedona) butterfly. It's strange and beautiful. You can see the butterfly's future antennae and proboscis etched onto the front. (San Marcos Pass, 2 June 2015)

 

I wonder what the bump is on the screen-left bottom?

Done