Eriococcus borealis, n. sp., ♀.—Sacs on twigs, closely felted, rather rough, broad oval, grayish-white, about 2½ mm. long. Gives no red colour on boiling in caustic potash. Skin after boiling, greenish or grayish, thickly beset with round to oval hyaline spots. Dermal spines only moderately numcrous, 27–45 μ long, the shorter ones more numerous than the longer. Caudal lobes long, brownish, irregularly, cylindrical, about 42 μ broad and 90 μ long. Buccal apparatus about 120 μ broad; rostral loop rather short; mentum rather long.