306 JOURNAL OP ECONOMIC ENTOMOLOGY [Vol. 1 



moderate flange at distal end. Antenna joints: Three, .19 mm.; four, .17 mm.; 

 five, .14 mm.; six, .09 mm.; seven, .23 mm. long. The sensoria are difficult to 

 see and appear to be variable in number. Near distal end of joint three I 

 have usually found 2 and upon joints four and five about 7 or 8 each (Plate 

 6, fig. 4). Described from specimens taken September 15, 1907, at Fort 

 Collins. 



The Woolly Apple Aphis, Schizonenra lanigera Hausm., Plate 5, 

 figs. 9, 10, 11. 



Some of the More Important Literature 



Aphis lanigera Hausm., Illigers Mag. I, p. 229, 1802. 

 Schizonenra lanigera Hartig, Germar's Zeit. Ent. Ill, p. 367, 1841. 

 Pemphigus pyri Fitch, 1st Rep. Ins. N. Y., p. 5, 1856. 

 Aphis lanigera Harris, Ins. Inj. to Veg., p. 242, 1862. 

 Eriosoma lanigera Verrill, Pract. Ent. I, p. 21, 1865. 

 Eriosoma pyri Riley, Ins. Mo. I, p. 118, 1869. 



Schizonenra lanigera Lowe, Ann. Rep. N. Y. Exp. Sta., for 1896, p. 570. 

 Schizonenra lanigera Marlatt, Circ. 20, Second Ser., Div. of Ent., 1897. 

 Schizonenra lanigera Garman, Bull, 80, Ky. Exp. Sta., p. 208, 1899. 

 . Schizonenra lanigera Alwood, Spec. Bull. (C. P. C. 45), Va. E. S., 1904. 

 Schizonenra lanigera Smith, R. I., Bull 23, Ga. State Board of Ent., 1907. 



In the warmer fruit growing sections of Colorado this louse lives 

 over winter regularly upon the trunks and limbs as well as on the roots 

 of the trees. Upon the roots it lives in all stages of growth, but upon 

 the top all the lice die except the last brood born in the fall. These 

 leave the places of their birth before molting, and apparently without 

 feeding or growing, to hunt a hiding place that will give them pro- 

 tection for the winter. The hiding places are beneath the dead bodies 

 of the partly or fully grown lice (which all die from the cold), 

 beneath scales of the bark, or about the crown of the tree between the 

 bark and loose dirt. These over-winter lice do not secrete any cot- 

 tony covering until they begin to feed and grow the following spring. 

 In this respect the woolly aphis has a habit similar to CJiermes coweni, 

 the last brood of which (var. coweni) rest upon the leaves of the red 

 spruce, or (cooleyi) on the bark of the blue spruce, without growing 

 or secreting a covering of wax threads from the late summer until 

 they are warmed into activity the following spring. Plate 5, fig. 11, 

 was drawn from one of these over winter young after it had begun 

 to grow in the spring, so it is a little too light in color and a trifle 

 broad across the abdomen for the typical over-winter condition. 



We have had no trouble to get the alate females to deposit* the true 

 sexual forms in confinement. We have been utterly unable to keep 

 these alate females upon the apple trees to deposit their young. They 

 seem possessed of a controlling instinct to get away from the tree. 



