With the modernization of travel and the improvement of roads throughout the United States, our country has become very mobile. Even though certain spiders are not indigenous to your area, they can be brought into your state by means of hitching a ride in moving vans, cars, motor homes, trains, buses, suitcases and any cargo that is shipped in freight. With this in mind, you must look at the possibility that any venomous spider that is out there, surely can be found anywhere in the USA including your own state.
Some of the species of spiders that have been found, that are considered harmful to man are the Black Widow, Brown Recluse, Hobo spider, Giant House spider, and the Yellow sack spider. Black Widow spiders can be found in every state in the U.S. but are more abundant in the southern states. Most adult black widow females are jet black in color and have two reddish triangles that are connected or an hour glass design on the underneath side. Their body is about 1/2 inch in length.
Brown Recluse spiders are generally found in the Gulf States. They can be found in other areas however; it would be because they were transported in from their natural habitat via commercial and or household movement. Brown Recluse adults are usually tan to dark brown with a dark fiddle shaped marking on the top of their body. The length of their body is about 1/4 inch to 1/2 inch in length. There are a number of different species of Black Widows and Brown recluse spiders, which can differ a little from the descriptions above.
The Hobo or aggressive house spider is approximately 3/8 inch to 5/8 inch across and has a chevron marking on the top of the abdomen. They look very similar to the Brown Recluse spider in size and color but do not have the dark brown fiddle shape on them. Not only do they look similar, but their bite reacts similarly too. The Yellow Sack spider is approximately 3/8 inch across the body. Spiders often enter building s through small cracks and crevices on the structure or from firewood or other items being brought in the house.
A thorough inspection by a train technician, along with a monthly treatment program can get and keep these spiders under control.