It is easy to identify poisonous spiders living in the United States, just by looking at their abdomen. The back that is farthest from the head is the abdomen on a spider. To differentiate it, remember that the legs are not attached to it.
To find out if a poisonous spider is a brown recluse, first of all look for the eyes. Must have six. Examine your abdomen. If it is spiked rather than rounded and if the head has a violin mark, in fact, it is a dangerous brown recluse. The mark that looks like the neck of a violin points towards the abdomen.
Check the underside of the abdomen of any shiny black spider. If there is a mark of an intense orange-reddish hourglass shape, it is a female black widow.
Stay away from a spider with legs and red head and a shiny black abdomen with glossy red spots surrounded by yellow. This is a red widow that relates to the black widow and whose poison is also very toxic. Another related spider, the brown widow, is more difficult to detect. Its round abdomen is tan brown and is marked with a contrasting colored dot at the bottom. Both species are native to Florida.
Look for yellow marks on the abdomen of a brown spider to see if it is a poisonous hobo. These spiders live in the northwestern areas of the continental United States.
Look at the texture of the abdomen and other parts of a black spider’s body to see if it looks like a soft piece of brushed cotton cloth. This is how a Badumna insignis venenosa (black house spider) looks. However, if you see a black abdomen on a red-headed spider and a set of fat fangs, it is likely to be a mouse spider, which is also very dangerous.
Get medical attention right away if you have been bitten by one of these species. Do the same if you have been bitten by any other type of spider and you begin to experience an allergic reaction.