DESCRIPTION OF LARVA. 81 
extending beyond the middle of the front also darker; frontal suture light yellow, sub- 
mentum yellowish white; antenne minute, one-jointed, situated at base of mandibles 
at ends of frontal suture; minute eye-spots usually present directly laterad and caudad 
of antennz; mandibles with two blunt teeth; palpi two-jointed; seven hairs on each 
side of the epicranium, two on the front, two on epistoma, two large and many small 
hairs on labrum, two on each mandible, two on submentum, two on mentum, one 
. SOL TT ~Mazillary patpus 
, ee x me Re Lalnal palpua 
1 \ = ~Palpifer 
Submentum Stipes Mentum 
Fig. 12—The plum curculio: Head of larva, with Fic. 13.—The plum curculio: Head of larva, lateral 
partsnamed. Muchenlarged. (Original.) aspect, with parts named. (Original.) 
on stipes, two on palpifer, and eight on lacinia; hairs arranged as shown in figures 
13 to 15. 
Thorax.—Prothcrax with a light brown chitinized shield on the dorsum and a 
slightly chitinized area on each side of the venter; a conspicuous oblong spiracle 
situated above the middle of the side, its long axis extending dorso-ventrally; three 
pairs of large hairs on the dorsum, two pairs of large and five pairs of minute hairs 
below the lateral line, arranged as shown in figures. 
Retractor muscle 
Labrum 
—— _-- Mandible 
are _-------Manilary palpus 
Sasa Set Lacinia Exrtensor muscle 
s<~;- - - ~- Labial palpi 
Retractor muscle 
SSE Mentum 
— - ~ -=-Stipes Retractor muscle 
=== ee Submentum Extensor muscle 
Seem < Cardo 
----- Gena. 
Fig. 15.—The plum curculio: 
Lateral, dorsal, and ven- 
Extensor muscle 
Fic. 14.—The plum curculio: Head of larva, ven- tral aspects of right man- 
tral aspect, with parts named. Much enlarged. dible of larva, with mus- 
(Original. ) cles. Much enlarged. 
( Original.) 
Mesothorax and metathorax without spiracles; each with one pair of large and four 
pairs of minute hairs on the dorsum, a large hair on the upper and one on the lower 
lateral lobe, one pair of large and four pairs of minute hairs on the venter, arranged as 
shown in figure 11. : 
Abdomen.—Segments 1 to 7 each with an oblong spiracle above the middle of the 
side, its long axis extending longitudinally; two pairs of large and three pairs of minute 
hairs on the dorsum, one large and one minute hair on each lateral lobe, and three 
pairs of minute hairs on the venter, arranged as in the figures. 
The eighth abdominal segment is smaller than the preceding and lacks the outer 
pair of large dorsal hairs. 
