CHIONASPIS SALICIS-NIGRAE. 



Aspidiotus saliris-nigrae Walsh, First Rep. Nox. Ins. 111., p. 39 (1867). 

 Mytilaspis salicis^ Baron, Trans. 111. Hort. Soc., app. p. 140 (1871). 

 Mytilaspis saliris Le Baron, Second Rep. St. Ent. 111., p. 140 (1872). 

 Chionaspis salicis Comstock, Rep. U. S. Dept. Agr., 1880, p. 



320 (1881). 

 Chionaspis salicis Osborn, Trans. la. St. Hort. Soc., Vol. XVII., p. 



214 (1882). 

 Chionaspis salicis Comstock. Second Rep. Dept. Ent. Cornell Univ. 



Expt. Sta., p. 1 06 (1883). 



Chionaspis salicis Comstock, Intro. Ent., Part I, p. 151 (1888). 

 Chionaspis salicis Packard, Fifth Rep. U. S. Ent. Com., p. 593 (1890). 

 Mytilaspis salicis Forbes, Seventeenth Rep. Nox. and Benif. Ins. 111., 



app. p. 23 (1891). 

 Chionaspis salicis Lugger, Bull. 43, Minn. Ag'l. Expt. Sta., p. 



224 (1895). 



Chionaspis salicis Lugger, First Ann. Rep. Ent. Minn., p. 128 (1895). 

 Chionaspis salicis Osborn, Proc. la. Acad. Sci., Vol. V., p. 224(1898). 

 Chionaspis salicis Osborn, Contr. from Dept. of Zool. and Ent. la. 



Ag'l. Coll., No. 3, p. 4 (1898). 

 Chionaspis ortholobis Bruneri Cockerell, Can. Ent., Vol. XXX., p. 



135 (1898). 



EGG. Oval, reddish-purple in color. 



SCALE OF FEMALE. Plate 3, Fig. i. Length, 2.6 4 mm.: moder- 

 ately elongated, broadest near the middle, distinctly convex, white. 

 Exuviae .8 .9 mm. long, usually yellowish-brown but sometimes 

 almost colorless. 



FEMALE. Pygidium usually very broad in proportion to its length. 

 Median lobes (Plate 7, Fig. 3,) broad, short, rounded, entire or 

 faintly serrate. Second and third pairs with the inner lobule larger 

 than the outer, entire or faintly serrate. Third pair often almost obso- 

 lete. The gland-spines are arranged as follows : 1,1-2,1-2, 1-3,5-6. 

 The dorsal gland-orifices are often of two kinds in this species. 

 Beside the usual groups of oval orifices there frequently occur 

 smaller circular ones which are also placed in groups. In such 

 examples the anterior group of oval orifices is wholly or in part 



