Again, good pictures - the mandible thickness is not easily photographed, I've tried and failed many times  
 The mandibles are very thin, although not "super" thin (as in 
leptomandibularis), so perhaps 
schencki is a good candidate? The brown pubescence on the head also agrees with it, but I'm still very inexperienced with the finer points of how to ID the 
ignita-complex. For example I still have no feeling for when a specimen is "stout" or when its "thin" etc etc...
It could be something completely different, although I would say from the look of the internal segments and the thin mandible that it is not part of the 
mediata, mediadentata, brevitarsis, pseudobrevitarsis type of species, rather the "inner" 
ignita-group (
ignitaA/B, 
angustula [which it could perhaps also be] 
longula etc). From what I have seen it does not agree with 
ignita A, 
longula, and certainly not with 
corusca &
 ruddii, which leaves 
angustula, schencki, ignita B,
 impressa and 
comta.. and I dont have any experience at all with the latter two.
I will stop rambling now 

Hopefully someone with much more experience will answer the question 

/Alex