Sinonimi: Latrodectus mactans
Venomous New World spider; the female is black with an hourglass-shaped red mark on the underside of the abdomen; SYN. Latrodectus mactans.
North American spider Latrodectus mactans. The male is small and harmless, but the female is 1.3 cm/0.5 in long with a red patch below the abdomen and a powerful venomous bite. The bite causes pain and fever in human victims, but they usually recover.