d 
ington, D. C. In 1886 it was reported from Lafayette, Ind. In 
1889 it was observed to be injurious at St. Charles, Mo. Soon after- 
wards it was recognized as a pest at St. Louis, where it attracted 
considerable attention. 
DESCRIPTION AND DISTRIBUTION. 
The adult of this species (fig. 3, a) differs considerably from that 
of the American rose slug, as will be readily seen by a comparison of 
the illustrations of the two forms. It is a larger insect and a mem- 
ber of a different genus. The wing expanse is about one-half of an 
inch for the female; a little shorter for the male. The ground color 
is black. The antenne are rather stout and acutely pointed, and in 
Fic. 3.—Bristly rose slug (Cladius pectinicornis) : a, Adult female; b, antenna of male; 
c, larva; d, head of same; e, female pupa; f, cocoon. All enlarged. (Reengraved after 
Riley, except d, original. 
the male the proximal joints, or those nearest the head, are pectinate 
or comb-toothed (fig. 3, 6), which has given rise to the specific name 
pectinicornis. 
The egg (fig. 4, @) is white, flattened, rounded, stoutest at the 
anterior end, and more pointed at the opposite end. It measures about 
0.8 mm. in length. 
The larva or slug, shown in figure 3, ¢, and figure 4, c, d, varies 
from yellowish to glaucous green, and the whole surface is quite 
bristly, especially at the sides, a character from which this larva de- 
rives its common name and which will distinguish it from the other 
two that feed upon the rose. The length when full grown is a little 
[Cir. 105] 
