Yes, they are. Lamias are a monogendered (female) repitlian demi-human race with the upper body of a human and the lower body of a snake.
Lastly if you are interested, here is the character profile of Lena (the Lamia in my story) which I posted a few months ago. I believe you don’t know her yet since you said its been a while since you’ve been here.
Occupation: Field Agent
Height: 173cm (height can vary depending on how high she stands on her tail)
Appearance: In her “human-form”, Lena has a curvy figure with fair skin, long bright red hair and amber eyes with slitted snake pupils. She also wears yellow ‘D’ hairclips on each side of her head. However, her appearance changes quite exentsive with her “real-form”. In her “real-form”, her ears are large, pointy and red, and she has fangs as well as a long tongue. She also has small red scales on her cheeks. Though, her most noticeable physical trait in her “real-form” is her long, red snake tail. Her full length is said to be 8 meters, suggesting that her tail is approximately 7 meters long.
Personality: Lena is a cheerful yet ditsy young woman, who sometimes even displays a certain naivety. She also has a quite optimistic nature and usually tries to see the positive things in even the most dire situations. However, as a member of a race most distinguished by its seductiveness and high sex drive, Lena possesses a very lascivious personality, which she displays on several occasions (mainly while being in the company of the MC). Lena can also be quite domineering and hot-tempered. Whenever she feels that her claim on the MC is threatened, she is quick to lash out at the person in question (sometimes even physically). However, even despite her sometimes arrogant and abrasive demeanor, Lena does have a softer side. It is save to say, that her feelings towards the MC are sincere and not the mere product of self-centered lust (as it is often the case by her kind). She is also very protective of them and would even put herself in harm’s way when she fears that their life is at risk. Also, despite viewing them as possible rivals for the MC’s affections, it is known that she cares deeply for her friends and fellow Agents.
Abilities: As a Lamia, Lena possesses elevated speed and agility as well as superhuman durability. She is also incredibly stealthy. This, combined with her great speed, allows her to move around incredibly fast and completely soundless. However, her most unique trait is her tail, which is a very strong and dexterous part of her body. It is strong enough to crush metal pipes, to lift up heavy objects or to completely immobilize enemies. She can also coil up her tail and use it as a spring to launch herself great distances. Also, thanks to her strong tail and the special scales on its lower side, Lena is able to easily climb up trees or to scale up entire buildings.
Lastly to finish things up, here are a few Pictures to give a idea for how Lena would look like: