Feb. 14, 1916 
Cherry Leaf Beetle 
947 
Table I .—Length of life cycle and number of molts of the cherry leaf beetle 
Eggs. 
First stage. 
Second stage. 
Third stage. 
Entered soil 
to pupate. 
Emergence 
of adult. 
Laid. 1 
Hatched. 
July 23 
... do. 
July 30 
July 29 
July 3° 
July 28 
July 27 
July 29 
... do. 
Aug. 9 
... do. 
Atl^. IO 
Aug. 28 
Do. 
Aug. 26 
Aug. 24 
Aug. 25 
Aug. 27 
Aug. 26 
Aug. 27 
Aug. 28 
...do. 
Aug. 4 
Aug. 8 
Aug. 4 
Aug. 6 
Aug. 8 
Aug. 7 
... do. 
Aug. 9 
Aug. s 
Aug. 7 
Aug. 9 
AU lo... 8 . 
... do. 
... do. 
... do. 
Aug. 3 
Aug. 1 
Aug. 2 
... do. 
... do. 
July 30 
July 28 
...do. 
...do. 
... do. 
1 From another series of experiments the length of the egg stage was determined. The eggs hatched as 
follows: 15,18, 17, 18, 16, 18, and 14 days after they were laid. The average is 16 days. If this were taken 
as the average length of the egg stage, the total length of the life cycle from the egg to the adult would vary 
from 48 to 53 days. 
DESCRIPTION OF LARVAL STAGE 
First instar. —The newly-hatched larva is depressed, fuscous in color, 
the head, thoracic shield, legs, and anal segment, black. Scattered over 
the larva are a number of setae. Length, 1.4 to 1.6 mm.; greatest width, 
0.45 to 0.50 mm. 
Second instar. —Nearly cylindrical, slightly depressed, fuscous to 
brown in color, the head, legs, thoracic and anal shields black. The 
ground color is almost entirely obscured by the black areas as shown in 
Plate LXIV, figure 2. On each segment, except the prothoracic and anal, 
there are two oval, rather sharply defined, large, black areas separated 
from each other by a narrow line. Laterad of the black areas are 
angular black markings as shown in Plate LXIV, figure 2. Length, 2.5 
to 3.5 mm. 
Mature larva, third instar. —Length, 6 to 8 mm., nearly cylin¬ 
drical, somewhat depressed, with an average width of about 2 mm. (PI. 
LXIV, fig. 3). The larva after the second molt measures 5 mm. in length 
and is black in color. As it feeds, the black spots and markings become 
separated and the brownish yellow ground color shows distinctly. Head 
black, narrower than thorax; mouth parts yellowish brown. Legs, 
prothoracic and anal shields black. Dorsally each segment, except the 
prothorax and anal segments, with two sharply defined oval to rectangular 
black areas separated by a brownish yellow line; laterad of each of these 
there is an angular black spot and beyond each of these a smaller rounded 
black mark. Along the lateral margin there is an elongate oval black 
spot on each segment. The venter of each abdominal segment is marked 
with five dark brown to black spots, the central one being largest. The 
prosternum is black; meso- and meta-stema each with a narrow, elongate, 
black area in front and two black rounded spots just caudad of it. 
