Based on Mr. Nobody's description, I'm assuming that this was intended to be for a recurrent trait of alien species for whom devouring the mate is a natural part of the life cycle (leading to possibly Blue and Orange Morality), whereas Black Widow is for humans who have ulterior motives for the same behaviour.
Take everything with you you want to lose. Freshly sponged spatial vectors enable propelling through sensory implosion default.
The description is short and not very good, and the examples don't explain much either. I think it needs a whole lot of clarifying in what makes the differences between the two tropes notable in terms of storytelling. I just don't see that here.
Edited. Not sure what I actually wrote there...
That's because you're conflating the literal spiders and the idiomatic women. Human "black widows", which is what the Black Widow trope is about, have human motivations for killing their husband that only superficially resemble the behaviour of the actual animals who do this. The actual animals that do this kill their mates for decidedly inhuman reasons. One is a trope about a certain kind of serial killer. One is a trope about the actual behaviour of bugs that is sometimes invoked for species that are not bugs.
This seems only to be only mildly related to Black Widow. A Black Widow kills their mate for financial gain. Conceive and Kill is killing your mate as part of the reproductive process or, at most, because the spouse will interfere with whatever plans you have for the child.
I assume you mean the line 'usually but not always for monetary gain.' Personally, I read that as meaning there's always some sort of gain involved like political power, money, assets or any number of things. Reproduction doesn't come into it, only the fact that the partner dies and the woman gets their stuff. Actual biology doesn't really touch on the subject. Conceive and Kill, on the other hand, is about reproducing and then killing the father. This might be part of the life cycle or something. Either way, the reason is different, thus I feel it's a different trope.
I'd like to reiterate that the only two things the literal arthropods and idiomatic women really have in common are the name and a dead husband or three.
Regardless of the precise motive of the idiomatic woman, her motive will always be a human one, and her victim's death may or may not take place during or very soon after sex.
Regardless of the precise motive of the literal arthropod, her motive will always be a necessarily inhuman one, and her victim's death will take place during or very soon after sex. (edit: She also usually eats the male, which is known as "sexual cannibalism" according to The Other Wiki)
The female praying mantis, for example, does not like having human voyeurs, and the male praying mantis head turns out to be a great comfort food to deal with that stress.
I say merge. I don't think we need 2 tropes about killing husbands. I would just broaden BW to include all instances of killing a mate for gain. Trying to split it up just seems silly and prone to misuse.
I would make the distinction that a Black Widow marries and kills for some kind of power. Money, political power, position, to conceive an heir and rule indirectly, whatever. It all comes to the same thing: A human motive based in greed or lust for power. Conceive and Kill, however, would be more of an alien creature life cycle thing. It's not done for any sort of material gain but simply because that's how the species works.
edited 13th Jun '13 11:51:07 AM by Arha
Single Proposition: Conceive And Kill
1st Jun '13 7:08:33 AM