It may be possible, but most likely not. It depends on the photograph, the species and all the other species with similar palps. In my personal opinion, it is a major mistake to try and identify most male spiders from photographs of palps, which are usually complex 3-dimensional structures which can look very different at slightly different angles, and where fine details are required for species id. This leaves aside other factors like size, and all the different features required to be sure of what you are actually looking at, such as patterns, eye arrangement, leg spines, trichobothria etc etc. You don't indicate what kind of spider you have, so can't really be more helpful. If you have the spider, by far the best action is to send it to someone who can identify it.
You are welcome to send it to me at 32 Lodge Lane, Grays, Essex RM16 2YP.
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