No, ghosts of the Donner Party have not started haunting my porch, nor have others of the human type I may have reference to. I am speaking of cannibals in the insect world of which there are many, but two in particuIar that make me stop and wonder. The first is waxy black with a small red hourglass on her abdomen. She dangles on a thin thread late on warm summer nights in doorways or dark corners waiting for the what ever comes her way. I am sure you guessed, it is the female black widow spider, (Latrodectus Mactans) that I am referring to, and she is no stranger to many porches and gardens around the world . Her potent neurotoxic venom is more deadly than a rattle snake, although the actual bite is less noticeable. But she is only one of the many cannibals waiting outside.
If you are lucky, your porch may attract a less deadly, human friendly cannibal, with lightning strike reflexes and human like characteristics. The adult praying mantis, of whom its been said, is the only insect able to swivel its head around 180 degrees. Mantis is the Greek word for prophet, and if you see one of these on your porch you are immediately impressed by its show of awareness and seeming lack of fear as it turns its head and watches you walk by. The praying mantis, also commonly called mantids, like the black widow, have a reputation of sexual cannibalism, in that the females are known for eating the males head after and sometimes during mating, which in truth only happens some of the time, however in the case of the mantids, the young nymphs emerging from their egg cases will begin to eat each other if another food source is not found within one or two days and they are kept caged together with no means of escape. They emerge from their eggs as tiny strings, one attached to the next, through a row of pin-sized holes in the egg. As the string grows longer they individually begin to unfold into tiny little creatures looking just like their parents, only wingless, stringy and weak, but able to walk or run to high ground, or I should say elevated branches and leaves as they seem to have an instinct to climb, like tiny infantry soldiers searching for a safe place to lie in wait for any soft bodied insect they can over-power while avoiding any large ants or meat bees which can easily carry them of at this age.
As a gardener and amateur entomologist I am naturally drawn to these two insects. In the case of the black widow, it is the possibility of a nasty bite, and a trip to the emergency room, which has always concerned me. In the case of the praying mantis, besides its mysterious fascination and pre-historic looks, it is its reputation as a beneficial insect for pest control that got my attention. Then I got a crazy idea about using the talents of the mantis to control the black-widow population by setting them out as sentinels on the porch and in the yard and so I went about gathering mantid egg cases from neighboring areas,