Incorrect text() font with LaTeX (Bug or feature?)

When using text() with plain text the font family can be changed.
When using text() with a LaTeX expression the font family can not be changed, only Arial results. Is this a bug or a feature?

Example:
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import numpy as np
from mayavi import mlab

data = np.random.random((3, 3, 3))
src = mlab.pipeline.scalar_field(data)

# Correct: Times font displayed
plain_text = mlab.text(0,0, r'Times_1', z=0.1)
plain_text.property.font_family = 'times'

# Incorrect: Arial font displayed when using LaTeX
LaTeX_text = mlab.text(0,0, r'$Times_1$', z=-0.1)
LaTeX_text.property.font_family = 'times'

mlab.show()
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