In the USSR there are two types of Karakulov of the genus Latrodectus living in the steppe and desert zone of the Central Asia, Crimea, the Caucasus, Ukraine, Moldova, Lower Volga region, on the border with Iran and Afghanistan.

Fig. 5. Mature female black widow :
left plump, right starving.

Externally, the male and female are not similar. The male is smaller than females in size (0,4-0,7 cm). Female reaches a length of 1-2 see the Color of her intensely black, with one or two red-orange or yellow, orange or reddish spots on the sides of the spider system (Fig. 5). Golovogrud relatively flattened pear shaped; 8 front of the eyes - two slightly curved toward the front row. Legs covered with rich short, turned-up hair. The male has a slim body with elongated abdomen, thin and long legs. Colour lighter than in females, and on the abdomen are bright red spots with white rim.
Karakurt dwell among different crops on non-irrigated land, abandoned irrigation ditches, on waste lands, clay walls of the corrals, more permanently at a low, smooth hills.
The age of sexual maturity of males and females take copulation (3rd decade of June). Temporary tenet females males are hanging motionless in a characteristic pose. From time to time they come alive, chasing each other, fighting and "caring" for a female: most active male drives away the rest to the periphery, where they take a waiting pose, cautiously approaching the female is in a state of sudden braking (catalepsy), squats, fulfilling the likeness of the mating dance, and slightly shaking spider threads, then straightens spiral of his Emblica and one of the palp firmly puts it to the copulative hole females, slowly immersing in a sexual way. After a few seconds, the female leaves catalepsy, tears of spider thread and capture with chelicerae fixed males, from which for a minute remains a shapeless lump. Female cleans the feet, hands thread and again falls into catalepsy, waiting for the next victim. Therefore it's called "black widow".
Not throwing tenet, the female at the beginning of may manufactures cocoons, and from August to mid September lay their eggs. In the autumn she dies, leaving from 1 to 13 cocoons 7-15 mm in size, each cocoon usually 50-60 eggs (P. I. Marikovsky, 1956), of which at 5-7 days appear spiders first age: in a few days they fade and pass in the second (developed) age, already having a spider and ethnonym apparatus. In winter they hibernate until spring remain in close pile. In late March and early April, when the ambient temperature of 15-20 C and surface up to 30 degrees, spider network going one or more groups of spiders; no eating, they willingly drink dew-drops and crawling on a new place. After traveling settle in selected places, stretched detectives shadows. Prosperity and fertility them, P. I. Marikovskaya (1956), depends on the availability of a variety of Orthoptera and beetles, and when starvation is a large wood lice. Karakurt tolerates starvation stationary (in laboratory conditions is about 3 months).
Migration of females is usually in the evening, at night or early in the morning, in the afternoon they sit on the snare and eat caught in a web of insects.