Black Widow Spider

INTRODUCTION The Black Widow, (Latrodectus mactans), is a poisonous spider of the family Theridiidae, order Araneida. The female, about 1.3 cm (0.5 in) long, is glossy black, densely clothed with microscopic hairs, and marked with a characteristic red hourglass on the underside of the abdomen. The male, which is rarely seen, is smaller than the female and has four pairs of red marks along the sides of the abdomen. The Black Widow is found in the warmer regions in every state in the United States except Alaska; it lives in a variety of natural and domestic habitats.
HABITAT The life cycle of the widow spiders are all similar. The female lays approximately 250 eggs in an egg sac which is about 1/2 to 5/8 inch in diameter. The eggs hatch in 20 days and remain in the egg sac from about 4 days to 1 month. The young spiders then molt to the second stage and begin feeding. As the young spiders grow, they construct a loosely woven web and capture progressively larger prey. Male spiders moult 3 to 6 times before maturing. The females moult 6 to 8 times and occasionally eat the males after mating. Generally, the females are not aggressive unless agitated, although they are prone to bite when guarding an egg sac.

INTRODUCTION

HABITAT