Alright, here I go...

[hider=Magma Drakes]
The magma drakes live in the city of Vulcan, which is located inside of Mt. Ignis, a volcano in the middle of the Wyvern Mountain Range. They tend to have incredible physical strength, and are usually immune to fire, heat, lava, or overheating in general. Their scales range from red to yellow, with some that have black scales as well, and their scales tend to come in a few different patterns, the most common of which looks like the magma that surrounds their city. They, however, are also usually very slow, and more often than not lack wings (hence the term drake). They are usually quadrupedal, with very few of them being serpentine, and even fewer actually having wings. They are at war with the Aquuis, who threaten to drown the land, and are allied with the nearby Wyverns.
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[hider=Aquuis]
An aquatic race of dragons that has mostly adapted to life underwater. They live in the underwater city of Azure, which is in the dead center of the Aquuis Ocean, much farther west than any of the towns which are located on land. Popular belief among the aquuis is that they are, in fact, in the center of their planet, whether or not that's been proven true by anyone. They tend to be quite attuned to magic, and are almost always capable of healing others, however, their claws and teeth aren't as tough or as sharp as the rest of dragonkind... and their physical strength isn't anything to write home about either. Aquuis tend to have webbed feet/hands, or a serpentine body, and almost always have blue scales to blend in with the ocean, they also usually have fins in place of wings, though, rarely, an aquuis is hatched with wings... unfortunately, this is seen as evil, and the wings are clipped at a very young age. They are at war with the Magma Drakes, who threaten to dry up their ocean, but are aided by the Forest Dragons who live in the Western Forest just off of their coast.
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[hider=Wyverns]
Once believed to be another species entirely, the wyverns occupy the mountain range that has been named after them on the eastern side of the continent. They have given up two of their limbs for unbeatable flight capabilities. As well as being able to fly, most wyverns have some sort of control over the wind, which makes it that much easier to fly, and to ground any flying opponent. They rarely have to rest in flight, however, they are quite vulnerable, with their scales being very light, and fragile as a result. They, too, are usually much lighter than the rest of dargonkind, and are, just like their scales, more fragile than the rest of dragonkind. They are also somewhat clumsy on the ground, however, they are experts at using their wind magic. They are at war with the Forest Dragons, who will stop at nothing to fill the land with towering trees which would break the wind and make it harder for the wyverns to fly. Their scale colors are usually pastel blues and whites, ranging from medium blue to stark white. They also tend to have cloud patterns on their scales, to blend in with the sky.
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[hider=Forest Dragons]
Forest dragons obviously live in the forest... the Lost Forest, to be more precise. This forest stretches for five miles from the Azure Ocean all the way to a mere two hundred feet from the Wyvern Mountain Range. The locals are very religious, and believe that the trees hold the souls of their dead. The Forest Dragons almost always have wings, and always walk on only two of their four limbs. They often carry a weapon with their other limbs, and are usually somewhat well trained in using said weapon. Their scales usually come in browns and greens, occasionally coming in striped or spotted patterns, in which case, they'll normally have some black scales, as well. Forest dragons are also good at finding and making natural cures from whatever plants may be surrounding the area at the time... however, their scales aren't too resistant to magic. They are allied with the aquuis, whose ocean helps feed their forest, and are at war with the wyverns, who threaten to destroy their forest, and what most of the Forest Dragons believe to be their ancestors in the process.
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I'm getting tired, but I'll come up with some more tomorrow... probably lightning dragons and ice dragons of some sort.