484 Report of the Department of Entomology of the 



Fourth instar: Pale green. Head slightly yellowish above. Two median longi- 

 tudinal lines of pronotum faint. Median area of abdominal segments pale yellowish 

 green; the three white spots are relatively small. Upper part of side of each segment 

 with a large elongate white spot reaching from front to hind margin, constricted or 

 divided in the middle and surrounded by a ground color of pale yellow. Sides below 

 are pure white. Antenna with a rather prominent white lump on the front and inner 

 Bide and bounded on the outer side by a curved black mark. Second segment with 

 an elongate spot. Length, 8 to 10 mm. 



Fifth instar: Top of head between eyes yellow or pale orange. Median area of 

 pronotum greenish; with two faint dark median lines. Abdominal markings as 

 in the fourth instar. White prominence on the first antennal segment, with a black 

 J-shaped mark; and the second segment with an elongate spot. Hind femora with 

 a few black spots near the extremity. Length 11 to 12 mm. 



Adult. — Very slender. Pronotum a little longer than greatest breadth. Color 

 very pale green. Light specimens have the top of the head between the eyes and 

 antennas yellow, and have a faint gray longitudinal streak on the pronotum. Darker 

 specimens have the top of head orange yellow or even burnt sienna and the streak 

 on the pronotum is strong brownish gray. Wings transparent, with greenish tinge 

 and greenish veins. Fore wings of male comparatively narrow. Antennae faintly 

 annulated with gray on the distal part. The first segment is yellowish with the 

 exception of a white prominence on the front and inner side, which bears a black 

 J-shaped mark, with the crook turned inward. (Fig. 30, b.) Length to end of abdomen 

 14-15 mm. Forewing of male 10-12 mm. x 4-5 mm. Forewing of female 12 mm. 



DURATION OF NYMPHAL STAGE. 



Angustipennis was first discovered in association with niveus 

 on apples during the summer of 1913 when the nymphs were mostly 

 in the third instar, and for this reason we have made very few 

 observations on its early life history. This species passed through 

 the various nymphal stages about a week or more later than niveus, 

 which may have been due to a slower development or to a later time 

 of hatching. On July 16 the nymphs were generally hi the third 

 stage and on July 25 they were practically all in the fourth instar, 

 while on these two dates niveus was mostly in the fourth and fifth 

 instars respectively. The adults also matured, on the average, later 

 than the latter species. 



During the latter part of October the adults become very inactive 

 and may often be observed clinging to the trunks and larger 

 branches of the trees. At this time the males are apt to 

 be very few in number and apparently they die off earlier than 

 the females. In the fall of 1912 living females of this species 

 were found as late as October 29, and on November 3 dead 

 ones were found on the trunk of an apple tree. In 1913 a 

 large number of females in fairly active condition were taken 

 in an apple orchard on October 28, but no males could be 

 found on this date. 



