Black Widow
there is a poisonous spider called the black widow that has a black almost shiny looking body with a red "hourglass" shaped red splotch on their underbelly. if that spider is the one your are talking about...it is poisonous. if you need to see a pic to make sure just look one up in google images
It may be a Black Widow spider. They are very poisonous and it is probably best not to approach it if you are unsure of the species. Black spiders have a distinctive red "hourglass" shape on its back.
If its black, has a large butt and there's a red shape on its back the resembles an hourglass, then its a black widow spider and they are very poisonous
The black spider that resembles a black widow without the red hourglass marking is likely the false black widow spider (Steatoda grossa or Steatoda nobilis). They are similar in appearance to black widows but lack the distinctive red hourglass marking. These spiders are not as venomous as black widows but can still deliver a painful bite.
A black widow is a a relatively small black seemingly hairless spider with a telltale red hourglass shape marking on its abdomen
It is a grass spider
Brown Widow Spiders. When the subject of dangerous spiders comes up, the average person usually thinks about the black widow spider. Their shiny black body with a prominent red hourglass marking on the underside of the abdomen is an image that readily comes to mind. Source: Google.com
The spiders you are referring to are black widows, known for their distinctive black coloration with a red hourglass shape on their underside. They are venomous and found in various parts of the world.
An entamologist would have to see it to give you an id. Part of it is counting it's eyes.
A black widow. This spider is only a black widow if the entire spider is black, with a round-ball looking back-body, female variety if there is a red hourglass shape marking on the underside of the spider. From the top black widows are completely black.
The Funnel Web spider is the most poisonous.
A poisonous spider can.