EXHIBIT 21.1

SUBSIDIARIES OF ATLAS ENERGY, L.P.



|                                               |  |              |  | 
|---------------------------------------------- |  | ------------ |  | 
|Name                                           |  | Jurisdiction |  | 
|Atlas Resource Partners, L.P.                  |  | Delaware     |  | 
|Atlas Resource Partners GP, LLC                |  | Delaware     |  | 
|Atlas Energy Company, LLC                      |  | Delaware     |  | 
|Atlas Energy Holdings Corp.                    |  | Delaware     |  | 
|Atlas Energy Holdings Operating Company, LLC   |  | Delaware     |  | 
|AED Investments, Inc.                          |  | Delaware     |  | 
|Atlas America Mid-Continent, Inc.              |  | Delaware     |  | 
|Atlas Noble, LLC                               |  | Delaware     |  | 
|Viking Resources, LLC                          |  | Pennsylvania |  | 
|Atlas Energy Tennessee, LLC                    |  | Pennsylvania |  | 
|Atlas Energy Indiana, LLC                      |  | Indiana      |  | 
|Atlas Energy Ohio, LLC                         |  | Ohio         |  | 
|Atlas Resources, LLC                           |  | Pennsylvania |  | 
|Atlas Energy Securities, LLC                   |  | Delaware     |  | 
|Anthem Securities, Inc.                        |  | Pennsylvania |  | 
|Resource Energy, LLC                           |  | Delaware     |  | 
|Resource Well Services, LLC                    |  | Delaware     |  | 
|REI-NY, LLC                                    |  | Delaware     |  | 
|Atlas Lightfoot, LLC                           |  | Delaware     |  | 
|Atlas Energy GP, LLC                           |  | Delaware     |  | 
|Atlas Pipeline Holdings II, LLC                |  | Delaware     |  | 
|Atlas Pipeline Partners GP, LLC                |  | Delaware     |  | 
|Atlas Pipeline Partners, L.P.                  |  | Delaware     |  | 
|Atlas Pipeline Operating Partnership, L.P.     |  | Delaware     |  | 
|APC Acquisition, LLC                           |  | Delaware     |  | 
|Atlas Pipeline Tennessee, LLC                  |  | Pennsylvania |  | 
|Atlas Pipeline Mid-Continent, LLC              |  | Delaware     |  | 
|Velma Intrastate Gas Transmission Company, LLC |  | Delaware     |  | 
|Slider WestOK Gathering, LLC                   |  | Delaware     |  | 
|Atlas Pipeline Finance Corp.                   |  | Delaware     |  | 
|NOARK Energy Services, L.L.C.                  |  | Oklahoma     |  | 
|Atlas Midkiff, LLC                             |  | Delaware     |  | 
|Atlas Chaney Dell, LLC                         |  | Delaware     |  | 
|Atlas Pipeline Mid-Continent WestTex, LLC      |  | Delaware     |  | 
|Atlas Pipeline Mid-Continent WestOk, LLC       |  | Delaware     |  | 
|Setting Sun Pipeline Corporation               |  | Delaware     |  | 
|APL Laurel Mountain, LLC                       |  | Delaware     |  | 
|Velma Gas Processing Company, LLC              |  | Delaware     |  | 
|Atlas Pipeline NGL Holdings, LLC               |  | Delaware     |  | 
|Atlas Pipeline NGL Holdings II, LLC            |  | Delaware     |  | 
|Atlas Energy Colorado, LLC                     |  | Colorado     |  | 
|Atlas Energy Resource Services, Inc.           |  | Delaware     |  |