New York Agrtctjltusal Experiment Station. 393 



On segments II to XII a median dorsal and two sub-dorsal shaded 

 areas which appear as three hnes or bands. These hnes vary in 

 distinctness in different individuals. Each sub-dorsal band is 

 interrupted by a distinct brown or black blotch on the second amiulet 

 of the IV to XI segments. The positions of the tubercles on segments 

 V to IX are : — ii slightly dorsal to i, i being situated at the upper 

 border of a sub-dorsal black patch ; iii lateral; iv and v remote, iv being 

 out of line with v, slightly below lower border of spiracle; vi posteriorly 

 sub-vented; vii, of the three setse on base of leg, the upper one not 

 closely approximated to the other two; viii next midventral line. 

 The arrangement of the setae on segments IV, X, XI is similar to 

 the above except that tubercle vii is represented by two setae on 

 segments IV and X, and by one seta on segment XL On segment 

 XII, i, ii, iii and viii are normal, and in the place of tubercles iv, v, 

 vi and vii there are three or four setse, occurring as pairs v/ith some 

 larvae and in other specimens as one pair and a single seta. This 

 difference in the number of these setse was frequently noticed on 

 the right and left sides of the same segment. 



Pupa. — The head, wing covers and tip of abdomen usually 

 blackish brown and the remainder of the body yellowish. This 

 coloration seems to be quite constant for the insects reared on 

 hawthorn, but pupse from caterpillars reared on cherry were yellow 

 or light orange, and dark about head and tip of abdomen. The 

 cremaster consists of six spines, surrounding the anal end. The 

 length is about 9 mm. and the width is 2.5 mm. Plate XL. 



Cocoon. — The cocoon is greyish and is from 10 to 12 mm. in 

 length and 3 mm. in width. It is elongated oval in shape, though 

 some specimens are distinctly pointed at one end, giving the cocoon 

 the form of an oat or barley kernel. The cocoons from caterpillars 

 reared on hawthorn are delicate and thin in texture so that the 

 pupa within is generally visible. The cocoons from plum were more 

 compact, and whitish. Plate XLI. 



Adult. — Head, palpi and antennae white. Thorax white with 

 a few black dots. Legs and abdomen white with a silvery 

 sheen. Fore wings snowy white or greyish. The grey coloration 

 is variable in extent and in depth of shade. Frequently the wings 

 are entirely clouded or the grey marking appears as a blotch extend- 

 ing from the costa to the fold or merely as a streak along the outer 

 or costal margin of the wing. The upper sides of the fore wings 

 have usually from twenty to thirty or more dots principally dis- 

 tributed in three rows; one near costal margin and one on each side 

 of the wing fold, with a variable number about the apex. Cilia 

 pale grey or white with greyish tips. The undersides of the wings 

 are grey or brownish grey and cilia grey. The hind wings are 

 ashen-grey or fuscous, with fringe sometimes somewhat paler. 

 Undersides grey, not differing appreciably from the upper surface. 

 Expanse of wings 19 to 22 mm. Plate XLII. 



