Ernobius mollis L., an introduced species, has been recorded 
from southeastern Canada and southward to Florida and Texas. 
It breeds in coniferous trees. The larvae usually feed under the 
bark, but may bore into the wood where the bark is thin. Bark- 
beetle weakened trees are particularly susceptible to attack. 
Adults are reddish brown and about 3.5 to 5.5 mm. long. EL. 
tenuicornis LeC. has been reported from many Eastern States 
and has been reared from loblolly pine twigs in North Carolina 
(40). Adults are uniformly yellowish brown and are about 2.5 to 
3.5 mm. long. #. granulatus LeC. occurs in several Eastern States 
and has been reared from pine twigs and cones. Adults are reddish 
brown and from 2.5 to 4.5 mm. long. 
Petalhum bistriatum bistriatum (Say) occurs from Massa- 
chusetts and New York to Ohio and south to the Gulf of Mexico. 
It breeds in the twigs of various hardwoods such as oak, dogwood, 
walnut, and buckeye (40). Adults are about 1.5 to 2.3 mm. long; 
the head, pronotum, and undersurface are reddish black to black; 
the elytra black; the legs reddish; and the antennae yellow. P. 
seriatum Fall. has been observed breeding in the dead twigs of 
pine, oak, and bittersweet. Adults are reddish brown to nearly 
black and about 1.5 to 2.5 mm. long. 
Ptilinus ruficornis Say is a rather common and injurious pest 
of woodwork in houses and stored products. Adults are about 2.8 
to 4.8 mm. long. Males are either completely black, or black with 
brown elytra, and have reddish-brown to reddish-yellow ap- 
pendages. Females have the pronotum bright reddish-brown, the 
elytra reddish-brown to reddish-black, and the appendages red- 
dish-brown to reddish-yellow. P. pruinosus Casey has been re- 
corded on cottonwood in Ontario, Canada; Indiana; and Ohio. 
Adults are similar in size and appearance to those of P. ruficornis. 
P. pectinicornis (L.), an introduced species, was first recorded 
from North America in New York in 1950 (650). Infestations 
were found in joists of beech and in sugar maple timber. Female 
adults are about 3.9 to 4.7 mm. long. The head, thorax, and ab- 
domen are dark brown. | 
Trichodesma gibbosa (Say) occurs from New Hampshire to 
western Ontario in the North and southward to Florida and 
Texas. Infestations have been found in sweet gum joists and in 
studding in old historic buildings in Tidewater Virginia. Adults 
are about 4.5 to 6.8 mm. long and covered with grayish-white to 
nearly white pubescence. 
Microbregma emarginatum emarginatum (Duft.) is generally 
present throughout the Northeastern States where it breeds in 
the outer bark of pines and hemlock. Adults are brown to dark 
brown and about 4 to 5 mm. long. Trypopitys sericeus (Say) oc- 
curs from Nova Scotia and southward to Florida, Texas, and Ari- 
zona. It breeds in the dead branches of oak, cherry, and hickory, 
and occasionally in flooring, sills, and furniture in buildings. 
Adults are reddish-brown and about 5 to 6 mm. long. 
Coelostethus notatus (Say) occurs in southeastern Canada and 
southward to North Carolina and Mississippi. It has been re- 
corded feeding in dead oak branches in Ohio. Adults are dark 
reddish-brown and about 3.2 to 4.3 mm. long. Eucrada humeralis 
(Melsh.) larvae feed beneath the bark of dead oak and beech 
133 
