THE LINDEN LEAF-BEETLE. 479 
9. The Linden leaf-beetle. 
Chry8omela scalaris Leconte. 
Order Coleoptera ; family Chrysomelid^e. 
Injuring the leaves, a stout-bodied beetle with silvery wing-covers spotted with 
green, laying its eggs on the leaves in the spring, from which fat, thick-bodied white 
grubs develop, with a lateral row of large black dots, and which also prey on the 
leaves. 
While this beautiful and abundant beetle is more *s* 
common on the alder, it also occurs on the lime-tree ftS$\ u 
and elm. They may be found on these trees in April, J| \A 
May, and June, and a second brood in September 
and October. We have taken them in coitu on the 
alder in Maine the middle of May. The grubs are 
hatched from eggs laid by the beetles on the leaves V 
in spring and come to their growth towards the end ^J®^ \ 
of June in Massachusetts, according to Harris, who no. 173.— chrysomeia 
believes that they go into the ground to turn to pupae. scaiaris.— smith del. 
Since the foregoing account was prepared, we have observed this 
beetle in all its stages. At Brunswick, Me., during July and August, 
1881, it was very abundant on the numerous linden trees in the campus 
of Bowdoin College, eating rounded holes in the leaves and causing 
them to turn yellow and unsightly, as if to prematurely fall. Nearly 
every tree and, in some cases, nearly every leaf on a tree was infested 
by the disgusting pale grubs, while scattered patches of eggs occurred 
on the under side of the leaves; and during the first to last of August 
the beetles were found not uncommonly upon the leaves. The trees 
could be protected by showering the leaves with London purple in 
water when the grubs first appear late in June. From these specimens 
the following descriptions were drawn up : 
Egg. — Rather large, oval cylindrical, yellow, several together attached by one end ; 
about 1.5 mm in length. 
Larva. — Body very thick, curved up like that of the grub of the Colorado potato- 
beetle, being much swollen behind the thoracic segments, while the tip of the abdo- 
men is curved down. Head honey-yellow, darker over the jaws ; antennae bluish, 
except at base ; eyes black. Prothoracic shield blackish in the young before the last 
molt ; in full-grown individuals not all black, but pale, with four irregularly square 
black spots. Body behind dirty white with a row of dorsal and lateral dusky spots. 
Legs pale, spotted with black at' the joints. A pair of meso-thoracic spiracles, and 
eight pairs of smaller abdominal ones. Low down, on the sides of the second and 
third thoracic segments a curvilinear black spot. Length, 8 to 9 mm . 
Papa. — Body pure white ; prothoracic shield with long scattered hairs around the 
edge and in two groups on the back ; antennas curving around between the eyes and 
jaws, and with the ends resting on the tips of the elytra. The insect undoubtedly 
descends into the earth to pupate. 
The beetle.— Head, prothorax, and under side of body dark coppery green, with seat- 
tered pits. Antennas, palpi, and legs pale pitchy yellow; elytra coppery green and 
whitish, the green forming a broad median stripe, sending prolongations outwards 
toward the middle of the elytra, the first pair of branches nearly parallel to the band, 
