POPLAR BORERS. 
437 
dence, with the unsightly swellings around the trunk. The upper 
branches of large trees are also occasionally girdled. From a gall 
collected at Providence a beetle issued May 31. There may be sev- 
eral mines in the same knot or gall. 
The beetle. — Uniformly gray, approaching the color of the downy under side of the 
poplar, with no spots, while the antennae are black, stained with gray at the joints. 
Length, 10 mra . 
4. The broad-necked prionus. 
Prionus laticolli8 Drury. 
Order Coleoptera; family Cekambycidje. 
Boring in the wood of the trunks and roots of different poplars, a white soft grub as 
thick as one's thumb, producing an oval moderately convex black long-horned beetle 
0.90 to 1.50 long and less than half as broad, its wing-covers rough from confluent 
irregular punctures and with two or three raised lines, its thorax with three irregular 
teeth along each side, and its antennae of twelve joints resembling little conical cups 
placed one within the other and projecting upon their lower side like the teeth of a 
saw : appearing abroad in July. (Fitch.) 
Though of late years injurious to the apple, grape-vine, and pine, this 
beetle may originally have been confined to the poplars, especially as 
Harris does not enumerate the above-mentioned trees, but says that it 
Fig. 162.— Broad-necked Prionus and pnpa.— After Riley. 
lives in the trunks and roots of the balm of Gilead, Lombardy poplar, 
" and probably in those of other kinds of poplar also. The beetles may 
frequently be seen upon, or flying around, the trunks of these trees in 
the month of July, even in the daytime, though the other kinds of 
Prionus generally fly only by night," Prof. S. J. Smith, in his report 
as Entomologist to the State Board of Agriculture of Connecticut, 
for 1872, remarks : 
I have noticed it in logs of poplar, bass-wood, and oak, and in the trunks of old, 
decaying apple trees, and Professor Verrill has collected it in great numbers, at New 
Haven, in chestnut railroad ties (p. 346). 
