I also landed on ETB (also referred to as a dog-headed boa in The Universal Cyclopaedia).

The rattlesnake is a rattlesnake, but has me stumped beyond that. I was thinking Crotalus durissus, even though they have pretty consistent diamond patterns from the images I've seen. I'm assuming either there's some pattern fluctuation in locality, or there was some kind of error made between the snake and the illustration (aberrant specimen, faulty description/miscommunication, misremembering, etc.). That, or it's a timber rattlesnake and has nothing to do with Brazil as a geographic distribution at all.