THe RispBED PINE-BORER 373 
(Kelloge, 1905). The: head is very large and is slightly wider than the 
prothoracic segments. It has a triangular incision behind, the apex of 
which is met by a curved line passing back from the outside of the 
‘antennae and dividing the epicranium into two areas. The clypeus is 
short and wide. The labrum 
is about twice as wide as it 
is long, and is moderately 
rounded in front. The an- 
tennae are small and two- 
segmented, the second joint 
being blunt at the tip. The 
mandibles are large, with 
three cutting teeth. The 
maxillae are composed of 
only two segments besides 
the three-segmented palpus. The labium is large, with a prominent ligula 
which is slightly rounded at the front edge. The labial palpi are two- 
segmented. | 
The prothorax is of about the same width as the other thoracic segments, 
but is more than twice as long. It has a flat, chitinized surface. The 
thoracic legs are slender and are 
composed of four segments. 
The abdominal segments in- 
crease slightly in length pos- 
teriorly to the eighth, which is 
longer but narrower than the pre- 
ceding ones. The ninth segment 
is of about the same length but 
is narrower than the eighth. The 
tenth is scarcely visible from 
above, being only about one- 
fourth as wide as the ninth; it 
is deeply cleft posteriorly. 
The mature larva measures from 25 to 30 millimeters in length, 
with a maximum width of 6 millimeters in the region of the head 
and the prothorax. The width of the first abdominal segment is 5 
millimeters. 
Fic. 63. CLYPEUS AND LABRUM, DORSAL VIEW 
Fic. 64. LEFT MANDIBLE, DORSAL VIEW 
