Introduction:
The question asks which of the following states has not identified a tribal community. The options given are Maharashtra, Chhattisgarh, Haryana, and Karnataka. Amongst these options, the correct answer is option 'C', which is Haryana.

Explanation:
Identification of Tribal Communities:
- In India, tribal communities are recognized and identified based on certain criteria such as distinct culture, language, and social practices.
- The identification of tribal communities is important for the government to implement various welfare schemes and programs for their development and upliftment.

Identification of Tribal Communities in Maharashtra:
- Maharashtra has identified several tribal communities within its state.
- Some of the major tribal communities in Maharashtra include Bhil, Gond, Warli, Kolam, Korku, and Halba.
- These tribal communities have their distinct culture, language, and social practices, which differentiate them from the mainstream population.

Identification of Tribal Communities in Chhattisgarh:
- Chhattisgarh is known for its significant tribal population.
- The state has identified various tribal communities such as Gond, Baiga, Oraon, Bharia, Halba, and Kamar.
- These tribal communities have their unique identity and contribute to the cultural diversity of the state.

Identification of Tribal Communities in Haryana:
- Haryana, in comparison to other states, has a relatively smaller tribal population.
- However, Haryana has not identified any specific tribal community within its state.
- The state's population is predominantly rural, with a majority belonging to the Jat community.

Identification of Tribal Communities in Karnataka:
- Karnataka is known for its rich tribal diversity.
- The state has identified various tribal communities such as Irula, Soliga, Kuruba, Jenu Kuruba, and Siddi.
- These tribal communities have their unique customs, traditions, and languages, which contribute to the cultural fabric of Karnataka.

Conclusion:
In conclusion, among the given options, Haryana is the state that has not identified any specific tribal community. Maharashtra, Chhattisgarh, and Karnataka have recognized and identified various tribal communities within their respective states. The identification of tribal communities is crucial for the government to formulate policies and schemes for their socio-economic development.