**Exhibit 21.1**

 

**List of Subsidiaries**

 
| **Evolution Petroleum Corporation — A Nevada Corporation** |
|-----------------------------------------------------------------|
|                                                            | Officers: |
|                                                            | Robert S. Herlin,   President and Chief Executive Officer |
|                                                            | Sterling H. McDonald, Vice   President, Chief Financial Officer and Treasurer |
|                                                            | Daryl V. Mazzanti, Vice   President, Operations |
|                                                            | Greg S. Goodale, Chief   Accounting Officer |
|                                                            | David Joe, Secretary |
|                                                            |   |
|                                                            | Directors: |
|                                                            | Robert S. Herlin, Chairman |
|                                                            | Laird Q. Cagan |
|                                                            | Edward DiPaolo |
|                                                            | Gene Stoever |
|                                                            | William Dozier |
|                                                            | Kelly Loyd |
|                                                            |   |
| **NGS Sub. Corp. — A Delaware Corporation**                |
|                                                            | Officers: |
|                                                            | Robert S. Herlin,   President and Chief Executive Officer |
|                                                            | Sterling H. McDonald,   Chief Financial Officer and Treasurer |
|                                                            | David Joe, Secretary |
|                                                            |   |
|                                                            | Directors: |
|                                                            | Robert S. Herlin |
|                                                            | Sterling H. McDonald |
|                                                            |   |
| **Arkla Petroleum, L.L.C. — A Louisiana Corporation**      |
|                                                            | NGS Sub Corp, Member |
|                                                            | Robert S. Herlin, Manager |
|                                                            | Sterling H. McDonald,   Manager |
|                                                            |   |
| **NGS Technologies, Inc. — A Delaware Corporation**   |
|                                                            | Officers: |
|                                                            | Robert S. Herlin,   President and Chief Executive Officer |
|                                                            | Sterling H. McDonald,   Chief Financial Officer and Treasurer |
|                                                            | David Joe, Secretary |
|                                                            |   |
|                                                            | Directors: |
|                                                            | Robert S. Herlin |
|                                                            |   |
| **Evolution Operating Co. Inc. — A Texas Corporation**     |
|                                                            | Officers: |
|                                                            | Robert S. Herlin,   President and Chief Executive Officer |
|                                                            | Sterling H. McDonald, Vice   President, Chief Financial Officer, Treasurer and Secretary |
|                                                            | Daryl V. Mazzanti, Vice   President, Operations |
|                                                            | David Joe, Controller |
|                                                            |   |
|                                                            | Directors: |
|                                                            | Robert S. Herlin |
|                                                            | Sterling H. McDonald |
|                                                            |   |
| **Tertiaire Resources Company — A Texas Corporation**      |
|                                                            | Officers: |
|                                                            | Robert S. Herlin,   President and Chief Executive Officer |
|                                                            | Sterling H. McDonald, Vice   President, Chief Financial Officer, Treasurer and Secretary |
|                                                            | Daryl V. Mazzanti, Vice   President, Operations |
|                                                            |   |
|                                                            | Directors: |
|                                                            | Robert S. Herlin |
|                                                            | Sterling H. McDonald |
|                                                            | Daryl V. Mazzanti |

 

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