on the larva of Pelophila, 137 
Head, The head is subquadrate, flat above with a 
deep median groove, and a deep lateral depression be- 
hind each antenna; hardly produced in front, the margin 
of the clypeus bearing four teeth of which the centrals 
are more prominent than the laterals; slightly convex at 
sides and beneath; rather strongly emarginate behind, 
but not constricted into a neck. Above and in front, 
the surface of the head is black and rugose, the epi- 
cranial and lower lobes are smvoth and yellow, each lobe 
beneath being marked with two longitudinal dark streaks 
(Figs. 4, 5). There are six ocelli on each side, situated 
just behind the antenna, arranged in two transverse rows 
of three each; the forward row is the longer, and its two 
terminal ocelli are the largest of the six, the dorsal 
ocellus of the hinder row being only slightly smaller 
(Fig. 6). 
Antenne. These are rather shorter than the head; the 
first segment is the longest, the second and third each 
three-quarters as long as the first, the fourth three- 
quarters as long as the third (Fig. 5). The third segment 
is enlarged distally and carries three papille, of which 
the longest shows rudimentary segmentation ; at the end 
of the fourth segment are two papille (Fig. 7). 
Mandibles, As long as the antenne, rather slender, 
evenly curved, bearing a stout tooth near the base 
(Fig. 4). 
Maxille. The stipes is elongate nearly half as long as 
the head; the lacinia is represented by a minute seti- 
gerous papilla; the galea is two-segmented, with the 
distal segment slightly longer than the proximal; the 
palpigerous stipes is short and cylindrical; the palp is 
three-segmented with the first segment slightly longer 
than the third, and the third, which is conical, slightly 
longer than the second (Fig. 8). 
Labium. The palpigerous stipites are short, cylindrical 
and divergent ; the palp is two-segmented, the proximal 
segment stout and cylindrical and rather longer than the 
distal which is slender and conical; the ligula is elongate, 
rounded at the tip, and bearing two long sete inserted 
close together, and directed straight forwards parallel to 
one another (Fig. 5). 
Thorax. The pronotum is trapezoidal, its length equal 
to its breadth in front, which is as broad as the head; 
evidently widened behind ; there are two lateral depres- 
TRANS. ENT. SOC. LOND. 1898.—PART II. (JUNE) 10 
