I bought what was labeled as a trio of these at the Cincinnati club auction in April 2005.  Unfortunately, they turned out to be a reverse trio.  They were not quite 3 inches (7 cm) long.  They are a relatively new introduction into the hobby having been featured in the 2001 Cichlid News in whats new from Lake Malawi.  They have grown to around 4.25 inches (11 cm) long.  There are several color morphs of the perspicax.  This one is from Ndumbi Reef in Tanzania and is also referred to as the Ps "perspicax orange cap"  They are supposed to be very aggressive although I have yet to see this behavior in my 180 gallon.  They are vegetarians ..... note the rounded mouth reminiscent of the Labeotropheus.

And below is the female Pseudotropheus perspicax:

 

I bought a few more at a local aquarium store in 2011:

And my young females are shown above

 

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see also:

http://malawicichlids.com/mw09007k.htm

http://www.bigskycichlids.com/Pperspicax_RT_ndumbi.htm

http://www.cichlid-forum.com/profiles/species.php?id=911