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Multiple Bezier Surfaces

I am trying to render multiple Bezier surfaces however I have having depth problems.  To render one piece I am using the code...

glPushMatrix();
glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4,
0, 1, 12, 4, &upperPosCtrlPoints[0][0][0]);
glMapGrid2f(20, 0.0, 1.0, 20, 0.0, 1.0);
glEvalMesh2(GL_FILL, 0, 20, 0, 20);
glPopMatrix();
The second piece that I render always shows through the first piece.  I am certain I have the normals facing the right direction. In my init method I have GL_DEPTH_TEST and GL_MAP2_VERTEX_3 enabled, as well as GL_AUTO_NORMAL and back face culling.  Any thoughts would be welcome!
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