Out here in California we have a hybred of the Black Widow called the Brown Widow. It has the same extremely strong web (that is a tell tale sign that a widow is close by), as well as the red hourglass spot. The dangerous thing about the Brown's is they do not mind being out in the open, where the Black widows like to be in dark cool areas. They have a very unique egg sack that looks like an old style ocean mine. Their bite is every bit as toxic as the their black cousin. I torch everyone I see.
