Burgess.] 
224 
[October 5, 
upper surface (figure 1, o.) first noticed by Westwood. A fine 
hair, as stated by Meinert, can easily be passed from one opening 
into the other, clearly demonstrating the canal. This evidently 
Fig. 1 . X 6. Head of larva from above, the epicranium removed to show the inte- 
rior. In the centre is seen the white brain with the optic lobes on either side sending 
nerves to the eyes as shown on the creature’s left. On this side is also drawn the anten- 
nal nerve, and one of the antennal muscles attached to the top of the endocranium, 
and lying between the antennal and optic nerves. Under these parts passes the great 
adductor of the mandible (a. in.) which has been removed on the right side, only a 
piece of its tendon being figured, oe., Oesophagus, gradually expanding into the phar- 
ynx, one of the posterior series of suspensory muscles of the latter (s. m d) being shown 
on the right. On the right in front of the brain are also the roots of four anterior suspen- 
sory pharyngeal muscles, pr., Process from the floor of the mouth for attachment of 
the large muscle which is drawn in place on left side, r., Ridge on the roof of the 
mouth, to which the frontal muscle {f. m.) is attached, the latter shown in place on 
the left. m. 1., The anterior boundary of the mouth, en., Endocranium. o., Basal open- 
ing of the mandibular canal. 
originated as a deep furrow along the inner edge, which is now 
closed by the growth of a very thin septum. If we peer or pry 
into the narrow but deep slit between the clypeus and labium, 
we do not discover any trace of a mouth, but the slit apparently 
