256 REPORT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 
TV. PAPILIO ASTERIAS ATTACKING CELERY. 
The larva of this species is popularly known as the celery 
caterpillar and in some localities the parsley caterpillar. It is 
known to feed upon a variety of plants of the family Apiacee 
(Umbellifere) among which are parsnip, parsley, dill, fennel, 
anise, caraway and carrot. In the celery growing section the 
caterpillar sometimes become quite abundant. During the 
spring and summer of 1900 and 1901 they were quite numerous 
in the vicinity of Geneva. They were especially noticeable on 
young celery plants in the seed beds, where they were sufficiently 
numerous to require attention every day. : 
The newly hatched caterpillars are nearly or quite black, with 
a white band about the middle and one toward the posterior 
end of the body. By the time they have become full grown 
they have changed to a pea-green color with a black band on 
each segment. In each of these bands are four orange-yellow 
spots, two on each side. Plate XXI is from a photograph, from 
life much enlarged, of one of these caterpillars nearly full grown. 
It was feeding on the celery stalk just before the picture was 
taken, but was induced to stop for a moment by a gentle jar 
of the stalk, when it assumed the attitude shown in the picture 
just long enough to be photographed. The same caterpillar is 
shown natural size at Plate XXII, Fig. 5. 
The adult is one of the well known “swallow tail” butter- 
flies. Both the males and females are black, with sulphur- 
yellow and steel-blue markings. The former has two bands or 
rows of sulphur-yellow spots crossing the wings on the outer 
half, between which are flecks or spots of blue. On the inner 
angles of the hind wings are eye spots nearly or quite sur- 
rounded by red. The female is less prominently marked with 
the sulphur-yellow spots but the blue spots are more prominent. 
The insect lives over winter in the chrysalis stage. The adults 
appear in May or early June and soon begin to lay eggs on the 
leaves, usually on the under surface of the plants that are to 
furnish food for the caterpillars. They hatch in about ten days. 
The young caterpillars feed voraciously and increase in size 
rapidly. In about two weeks they are full grown and seek a 
