Dangerous Scorpion .

The Death-stalker (Leiurus quinquestriatus )

Another very dangerous scorpion. It is known to occur quite commonly in deserts of North Africa and South West Africa.
It has one of the highest potency among scorpions to mice.

Yellow Scorpion (Tityus serrulatus)

A Brazilian scorpion which is extensively studied by CEVAP. Even though there are few documented deaths (death mainly comes from children under 7), the symptoms is severe and among 5% of the patients studied by R.M.Lira-da-Silva and his co workers, there is systemic involvement. This represents a very significant percentage.

Fat tailed scorpion (Androctonus crassicauda)

Another dangerous scorpion found more commonly in SouthWest Asia. 

Black fat tail scorpion (Androctonus bicolor)

Not all deadly scorpions are shades of yellow. A.bicolor is black and again note the extraordinarily slender pedipalp and thick metasoma. This is quite often confused with Androctonus crassicauda (black variety) but its pedipalp is comparatively slender.

Buthus occitanus tunetanus

This specimen is caught from Tunisia and represents well the genus Buthus. It is the species which has vastly different LD50 for its subspecies. The one is South France has much less potent venom. Needs no rocket scientist to which subspecies lives in France.

Fat tail scorpion (Parabuthus transvaalicus)

The Parabuthus transvaalicus is one of the largest scorpions in the family Buthidae. It is one of the most venomous scorpions in Southern Africa and is especially dangerous to children. This scorpion has relatively small pincers and is known for its ability to spray venom over 1 metre as its main defence. This hairy species of scorpion grows to a length of 12 - 14cm and they are commonly seen in black and brown or chocolate-brown colours. This species is a desert/scrub land scorpion and is found in Botswana, South Africa, Zimbabwe and Mozambique under logs and stones as well as in thatched roofs.

Arizona Bark Scorpion (Centruroides exilicauda)

The Arizona Bark Scorpion is usually found in urban areas rather than desert areas.  They prefer cool and moist areas and can be found under pieces of bark, under rocks and in houses.  

Striped bark scorpion (Centruroides vittatus)

The Striped Scorpion or Striped Bark Scorpion Centruroides vittatus, is the most widespread scorpion in the United States. This is an extremely small scorpion, an adult only reaches about an inch in total length, though they can get up about 1 1/2. They are variable in color and pattern, generally a light orange or reddish color with darker two dark, longitudinal stripes on its carapace and a dark triangular mark on its head.

Yellow legged creeping scorpion (Opistophthalmus glabrifrons)

Little data known, but sting is probably moderate painful. This species has no medical significance for healthy humans (an anecdontal source says that the venom can have unpleseant systemic effects, but this has not been verified). This species will sting readilly, and has very powerful pincers which can pinch very painful.