THE BUD MOTH 



LARVA 



In Wallingford some individuals passed through six larval instars 

 and others through seven, but except for a slight difference in size 

 there seem to be no noticeable differences between the two. 



FuU-grou-n larva (PL II, B, C).— Width of head 0.94 to 1.16 millimeters; 

 average 1.05. Length 11 to 13 millimeters. General color dull brown ; head 

 from medium brown to nearly black, shiny ; thoracic shield shiny, dark brown 

 to black, divided in the middle by a longitudinal paler line ; mouth parts brown, 

 lighter than head; antennae pale at base, darker at tips; anal shield dark; 

 ventral surface paler than dorsal ; thoracic legs dark brown, almost black, 

 shiny ; prolegs pale, crotchets biordinal and in a complete circle, 32 to 48 in 

 number; surface of body finely granulate; tubercles darker than surrounding 

 body surface, finely lined, shiny, with darker dots at bases of setae ; chitiniza- 

 tion about thoracic tubercles very large; three setae on prespiracular shield 

 of thorax in longitudinal line ; setae IV and V on proleg-bearing abdominal 

 segments under spiracles closely approximate and on the same chitinization ; 

 paired setae II on ninth abdominal segment on one chitinization and closer 

 together than paired I on dorsum of eighth abdominal segment ; II and III on 

 ninth abdominal segment on the same chitinization and closely approximate ; 

 eighth abdominal seta III directly anterior to spiracle ; a short, small anal fork 

 w T ith 2 to 5 prongs of irregular length. 



First stage. — Width of head 0.22 millimeter ; length when newly hatched 

 1.05 to 1.27 millimeters; length when full fed about 2 millimeters. When 

 newly hatched, the larva is white ; head shiny black ; thoracic shield very dark 

 gray, almost black ; anal plate gray, paler than thoracic shield ; ventral sur- 

 face much the same color as dorsal ; thoracic legs dusky ; prolegs concolorous 

 with the body. Body with sparse, long, white hairs. After feeding a few days 

 the larva becomes a dirty yellowish white, and then light brown. 



Second stage. — Width of head 0.28 to 0.39 millimeter, average 0.33; length 

 when full fed 2.5 to 3 millimeters. General color light brown ; head very dark 

 brown to black, shiny ; thoracic shield the same ; anal shield darker brown than 

 the body, but not nearly as dark as thoracic shield ; venter much the same color 

 as dorsal surface ; thoracic legs very dark brown to black, shiny ; prolegs 

 concolorous with the body; tubercles distinct; hairs creamy wmite, moderately 

 long, sparse. 



Third stage. — Width of head 0.39 to 0.52 millimeter; average 0.45. Length 

 when full fed 3.5 to 4 millimeters. General color dull brown ; head a shiny 

 black; thoracic shield shiny, very dark brown, practically as dark as head; 

 anal shield dark brown, shiny ; ventral surface not quite so dark a brown as 

 dorsal ; true legs dark brown ; prolegs somewhat paler than adjacent body 

 surface; tubercles distinct, shiny; hairs moderately long, sparse, white. 



Fourth stage. (Hibernation usually occurs in this instar, the larva molting 

 during the construction of the hiberculum.) — Width of head 0.41 to 0.55 mil- 

 limeter, average 0.50; length in hibernating condition about 3 millimeters; 

 length when full fed after emergence in the spring about 5 millimeters. Body 

 color an almost uniform cinnamon brown, with some variation from darker 

 to lighter ; head and thoracic shield a dark shiny brown, head a, little darker, 

 almost black ; thoracic shield a little lighter on anterior margin ; anal plate 

 from concolorous with the body to a little darker; thoracic legs a somewhat 

 darker brown than the body; prolegs concolorous with the body; mouth parts 

 brown, paler than head; tubercles conspicuous, concolorous with the body, 

 shiny ; hairs sparse, short, white. 



Fifth stage.— Width of head 0.66 to 0.80 millimeter, average 0.71; length 

 when full fed 7.5 to 8.5 millimeters. General color a dull brown, sometimes with 

 an olivaceous tinge ; head and thoracic shield dark brown to black, shiny ; 

 mouth parts brown ; antennae pale nasally, darker toward tips ; anal plate 

 dark greenish brown ; ventral surface not quite so dark as dorsal ; thoracic legs 

 piceous, shiny ; prolegs about concolorous with the ventral surface, with a dark 

 area on outer side ; tubercles with a minute dark dot ; hairs sparse, white. 



PUPA 



PI. II, D 



Female. — Length 6 to 7 millimeters ; width at widest point 1.8 to 2 milli- 

 meters. Color golden brown, deeper at head, wing pads, anal segment, and 



