Tue RisBBED PINE-BORER 3 369 
infested are the white pine (Pinus strobus L.), the pitch pine (Pinus 
rigida Miull.), and the red pine (Pinus resinosa Ait.). 
These insects are usually reported as pine insects, and it seems probable 
that they attack all or nearly all species of pines throughout the United 
States and southern Canada. The writer has never found them infesting 
other conifers, such as larch and spruce, though it is possible that they 
may attack these at times. 
METHODS OF BREEDING 
Numerous attempts were made by the writer to determine the molts 
of this insect, but with little success. For this purpose pieces of bark 
were taken.to the college insectary, cavities were made on the inner side 
of the bark, and larvae were placed in these cavities and covered with strips 
of celluloid as shown on Plate VIII, 5 and 6. The bark was kept in dark, 
moist jars, where it was easily accessible for examination. Though these 
larvae lived for many months in an apparently normal condition, they never 
reached maturity. For making shorter observations, such as that of 
the pupal stage, this process was very satisfactory. 
LIFE HISTORY AND DESCRIPTIONS 
The adult 
_ This species, Rhagium lineatum Oliv., no doubt owes its specific name 
to the three smooth, rather strongly elevated, lines or ribs extending 
lengthwise along each elytron. The beetle is elongate, rather robust, 
and black mottled with reddish brown and gray. The greater part of 
its surface is covered with grayish hairs, giving it a grayish pubescent 
appearance. 
The head, which is slightly narrowed behind the eyes, is attached to 
the thorax by a short neck. The antennae are short, scarcely reaching 
the bases of the elytra; they are not enveloped by the eyes but are inserted 
in front of and between them. ‘The maxillary palpus is longer than the 
labial palpus; the last segment of each is bluntly pointed. The labrum is 
free. The eyes are oblong and slightly emarginate. The mandibles are 
flat, acute, and fringed on the inner margin. 
The thorax is cylindrical, not margined, and much narrower than the 
elytra. It is armed on each side with an acute tubercle. 
