474 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
91. Dicerea prolongata Lee. Bores in the aspeii (Cockerell, Ent. Mouth. 
Mag., London, March, 1888, p.232; also for the specific characters 
see Can. Ent., xx, p. Go). 
92. Xanthonia viUosula (Mels.). Common on leaves. (Chittenden in 
letter). 
HEMIPTERA. 
93. Chaitophorns candicans Koch. Balm of Gilead. 
94. Chaitophorus populicola Thos. 
95. Pemphigus populiramulorum Riley. 
9G. Pemph ig us pop ulitra ns versus Riley. 
97. Pemphigus pop ulimonilis Riley. 
98. Pemphigus pseudobyrsa (Walsh). 
99. Pemphigus vagabundus (Walsh). 
HYMENOPTERA. 
100. Cimbex americana Leach. (Lugger, Bull. No. 9, Ag. Exp. Stat., 
Xov. 1889, p. 48). 
INSECTS INJURIOUS TO THE BASS-WOOD 0E LINDEN TREE. 
Tilia americana Linu. 
AFFECTING THE TRUNK. 
1. The linden borer. 
Saperda vestita Say. 
Order Coleoptera ; family Cerambycmxe. 
Boring in the trunk, undermining the bark for 6 or 8 inches in sinuous galleries, 
or penetrating the solid wood an equal distance, rather slender grubs, with three 
pairs of thoracic feet, transforming into a greenish snuff-yellow longicorn beetle, with 
six black spots near the middle of the back. 
Fig. 171.— The Linden borer, beetie of nat. size, a, upper, &, under, side of-head and three thoracic 
segments; c, side view of head of grub ; d, top view of two segments, showing theoval spots ; e, the 
grub, slightly enlarged.— From Packard. 
The beetles, according to Dr. Paul Swift, as quoted by Dr. Harris, 
were found in Philadelphia upon the small branches and leaves May 
28, and it is said that they come out as early as the first of the month, 
