The 11 types of Brahmanas

Atri's classification of Brahmanas - Source: PV Kane's History of Dharmśastra Volume 2 Part 1, pg 131 on the discourse in the Atri Smriti:

1. Deva Brahmana: Bathe daily, do Puja, SandhyaVandanam, homam, honor Aditis (guests) & Vaishvadevas

2. Muni Brahmana: Lives in a forest subsisting off roots, fruits & vegetables, doing daily Shraddhas

3. Dvija Brahmana: Twice-born. Studies Vedanta, gives up all attachments, engages in Samkya & Yoga (implying AshtAnga Yoga).

4. Kshatra Brahmana: Fights to defend the motherland.

5. Vaishya Brahmana: Trader, farmer, rears cattle.

6. Shudra Brahmana: Sells meat, lac, dyes like Kusumba, milk, ghee, honey

7. Nishada Brahmana: loves meat & fish, thieves & robs, backbiter.

8. Pashu Brahmana: Knows nothing on Brahman but is proud of his birth & sacred thread.

9. Mleccha Brahmana: Obstructs or destroys wells, gardens & tanks without qualms.

10. Chandala Brahmana: Adharmic, cruel, foolish, does no prescribed rites.

Not in Atri's list:

11. Unchavritti Brahmana: living by alms, not accumulating money, perform Sandhya, keep Agnihotra (Shrautagni), follow Dharma.

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