Twelfth Report op the State Entomologist 221 



The larva when full grown measures about half an inch in length. It 

 is almost cylindrical, sixteen-fooied, of a very pale green color, divided 

 into fourteen segments by rather deep wide transverse constrictions. It 

 has two rows of elevated white spots along the back, and one along each 

 side, each segment having one spot in each row, or four spots in all, and 

 between the spots is a smaller white elevated dot, and another similar 

 dot below the lower spots. From each of these elevated spots and dots 

 white bristles of different lengths stand out in all directions. (PL IV, 

 fig- 4-) 



Life-history of the Insect. 



There seems to be very little definite knowledge of the life-history of 

 this insect. The larvae may be found soon after the leaves begin to 

 appear, and complete their growth during the last of May or early in 

 June. Prof Riley gives the duration of the larval existence as about 

 three weeks. Several larvae received from Prof. Peck the past season 

 pupated May 25th and others June ist. The moths emerge about the 

 middle of June. From this time until the appearance of the caterpillars 

 on the vines the following spring, nothing definite seems to be known of 

 the life-history of this insect. There is but a single brood in a season, 

 according to Dr. Fernald. Mr. Saunders is of the same opinion and he 

 suggests that it may pass the winter in eggs deposited on the canes of the 

 vines near the base of the bud from which the next year's branch is de- 

 veloped. Prof. Riley, reasoning from analogy, suggests that the insect 

 has two annual broods and that the second hibernates in the adult form. 

 According to Furneaux,* the late feeding Pterophori emerge in the 

 autumn and hibernate as moths, but of the hibernation of the earlier 

 appearing ones no hint is given. It is in the imago state that the 

 second brood of the English Agdistis befuietii passes the winter (see 

 Fernald loc. cit.). No one has reported examples of a second brood of 

 O. periscelidaclylus, although several careful observers have looked for 

 them. The moths of the single-brooded Alucita hexadactyla emerge in 

 England during August, and remain on the wing until October, and 

 then hibernate. After making due allowance for the difference in climate 

 between this country and England, it seems reasonable to suggest that 

 our gartered plume may fly through July into August under normal con- 

 ditions, and then pass into hibernation, or, as suggested by Mr. Saunders, 

 it may winter in the egg state. There appears to be little ground for 

 supposing the insect to be double-brooded. 



Of a large number of the moths which were reared during the latter 

 half of June — a few days after they had emerged, several were observed 



*Butterflies and Moths (British), 1894, p. 294. 



