Head and mouth-apparatus of the larva of  Protaxymyia  melanoptera MAM. et  KRIV.  ( Axymyiidae ).
1 -- Head, dorsal view.  2 -- Head, ventral view.  3 -- Lower lip (labium) and maxilla, ventral view.  4 -- upper lip (labrum), ventral view.  5 -- Clypeus and upper lip, dorsal view.
plb = labial palp,  lbr = upper lip,  cl = clypeus,  fr = frons [frontal plate],  lpl = side-plate of head,  lb = lower lip,  mx = maxilla,  st = stipes,  crd = cardo.
(After MAMAJEV & KRIVOSJEINA, 1966)