**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 |
|                                                             | David Joe, Secretary |
|                                                             |   |
|                                                             | Directors: |
|                                                             | Robert S. Herlin,  Chairman |
|                                                             | Laird Q. Cagan |
|                                                             | Jed 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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