32 THE PLUM CURCULIO. 
The ninth abdominal segment is considerably smaller than the preceding, truncate 
posteriorly, has no spiracles, and bears two pairs of large and one pair of minute hairs 
on the posterior dorsal margin and two pairs of minute hairs on the venter. 
The anus, surrounded by three anal lobes, is situated on the ventral posterior part 
of the ninth abdominal segment. 
eras ve THE PUPA. 
------- Mauillary palpus 
prtrccee Lacinia 
age k. pacar ees Length 4.5 to 7 mm.; breadth 2.3 to 3.75 mm.; 
eas color white, in older specimens the eyes becoming 
reddish brown and then black and the mandibles 
-- Submentum and the tarsal claws becoming chitinized and visible 
through the pupal skin. A round spiracle is visible 
on the side of the second to fifth abdominal seg- 
ments, that on the first segment being covered by 
Fic. 16.—The plum curculio: Dorsal the pad of the elytron. 
aspect of maxilla and labium of The hairs of the pupa, except those on the head, 
eae ouewa ae Much Jegs, and some on the prothorax, arise from tuber- 
: : cles and are easily broken off. On the head there 
isa pair of large hairs near the vertex, a pair just above the eyes, a pair between the eyes, 
a pair on the front of the beak just above the insertion of the antenne, a pair of smaller 
hairs lower down the beak, and a more widely separated pair of minute hairs still lower 
down the beak. There are eight pairs of hairs on the prothorax, two pairs on the 
mesoscutum, two on the metascutum, and two pairs on the distal end of each femur. 
The pads of the elytra are elevated into ridges, from which arise groups of hairs on 
tubercles, there being about seventeen hairs on each elytron. Abdominal segments 
1 to 6 each bear two pairs of dorsal and one pair of lateral hairs. The seventh segment 
has an additional pair of lateral hairs, while the eighth segment has only one pair of 
Fig. 17.—The plum curculio: Pupa, showing structural details—a, ventral; b, lateral; and c, dorsal aspects. 
(Original. ) 
dorsal and one pair of lateral hairs. The ninth segment has a stout spine and a hair 
rising from a tubercle on each apical angle, and a pair of hairs on the venter. (See 
fig. 17 and Pl. I, fig. 4.) 
