notched, while in C. caryae they are entire. There are also other 

 important differences. 



The specimens from which the foregoing descriptions were made 

 are in the Department of Agriculture and were collected on the bark 

 of " Hickory " at Washington, D. C. 



CHIONASPIS AMERICANA. 



Chionaspis americana (Johnson MS.) Howard, Bull. U.S. Dept. Agr., 

 Div. Ent, Tech. Ser. No. i, p. 44 (1895). 



Chionaspis americana Johnson, Ent. News, Vol. VII., p. 150 (1896). 



Chionaspis americana Johnson, Bull. 111. St. Lab. Nat. Hist., Vol. IV., 

 p. 390 (1896). 



Chionaspis americana Lugger, First Ann. Rep. Ent. Minn., p. 129 

 (1896). 



EGG. Slightly more than .2 mm. long ; ellipsoidal ; purplish. 



LARVA*. Length .22 mm.; width .13 mm.; Ovate in outline, 

 broadest posteriorly. Red. Anal filaments distinct except at the 

 base ; about as long as the width of the body. A row of dark spots 

 along the lateral margin posteriorly. 



SCALE OF FEMALE. Plate 2, Fig. 6. Length, 2 3.2 mm. Usu- 

 ally broadest near the middle. Plainly convex, moderately thick in 

 texture. The color of the scale itself is pure white but it is often 

 coated by a black sooty substance or by the epidermis of the bark 

 which affects the general color and often obscures the scale from 

 view. Exuviae .7 mm. long, brown, often almost completely hidden 

 from view by the superficial coatings above mentioned. When 

 removed from the bark a conspicuous white scar is left. 



FEMALE. Plate 8, Figs. 3 and 4. Broadest toward the posterior 

 end ; yellow or brownish, the central portion darkened and of a pur- 

 plish tinge when containing eggs. Median and second pairs of lobes 

 well developed and distinct ; third pair sometimes well developed 

 and sometimes very obscure or absent. A club-shaped process 

 extending anteriorly from between the median lobes. Median lobes 



*The description of the larva is made from Johnson's description and my own observation. 



