. The Canadian entomologist. Insects; Entomology. 38 THE CANADIAN ENTOMOLOGIST. The Mature Larva.—Length lG-18 nun; diameter of second abdominal seg- ment 3 mm.; width of head mm. The shape is nearly cylindrical, tapering slight- ly towards both extremities. The general colour is greenish \ellow al)o\e, light \ellow on sides and beneath. The head, mouth parts, cervical shield, thoracic legs and spiracles are shiny black. The heafl is notched or emarginate on its caudal border and the cervical shield is divided by a median longitudinal line. The body is beset with numerous shiny black seti
. The Canadian entomologist. Insects; Entomology. 38 THE CANADIAN ENTOMOLOGIST. The Mature Larva.—Length lG-18 nun; diameter of second abdominal seg- ment 3 mm.; width of head mm. The shape is nearly cylindrical, tapering slight- ly towards both extremities. The general colour is greenish \ellow al)o\e, light \ellow on sides and beneath. The head, mouth parts, cervical shield, thoracic legs and spiracles are shiny black. The heafl is notched or emarginate on its caudal border and the cervical shield is divided by a median longitudinal line. The body is beset with numerous shiny black setigerous warts or tul)ercles, as shown in the figure. The Yoiin^ Larva.—The larva in its lirst instar is mm. long and differs very little from the mature larva except in size and in being a darker greenish yel- low anteriorly and a lighter yellow posteriorly. The Pupa.—The pupa measures 1 mm. long and .3 mm. wide The thoracic seg- ments are dark brown and the abdominal segments a lighter brown. The Adult.—The adult is a greyish moth with a wing expanse of 23^ mm. The wings are of a satiny lustre and fringed with long hairs. The front wings are a dark grey with darker longitudinal streaks, the hind wings a uniform light grey. When at rest, the wings are held flat over the back, giving the insect a flattened appearance. Life History and Habits. The eggs were first observed this season on June 18th. They are deposited singly and in large numbers on leaves, stems, and particularly on the sheath surrounding the flower heads. The time spent in the egg stage averages about seven days, and the period of oviposition extends over a considerable period, as newly. Fig. 1. Parsnip Wcbworin, mature larva (X 11). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Entomological Society of Canada (1863-1871); Entomo
Size: 872px × 2867px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubje, booksubjectentomology
