11 
The first thoracic segment is blue and the last two are gray.t. The 
larva habitually rests in the coiled or curled position shown in 
figure 5, 6, one that is never assumed by either of the other rose slugs, 
and it is from this habit that it derives its English name. 
In addition to Boston, it has been authentically reported from 
Jamaica Plain, Roxbury, and New Bedford, Mass.; portions of 
Maine; Allegheny, Pa.; New York, and Canada. In the Eastern 
Hemisphere this species ranges over the major portion of Europe, 
» extending into Siberia. 
NATURAL HISTORY. 
The coiled rose slug is credited with being double-brooded, and as 
it extends its range southward it will probably produce a third gen- 
eration, since we know of the appearance of the “ worm” from May 
Fie. 5.—Coiled rose slug (Hmphytus cinctus) : a, Adult female; b, full-grown larva; e, 
head of same; d, work on plant; e, e, young larve at work. d, e, Natural size; a, b, 
enlarged; c, more enlarged. (Reengraved after Riley.) 
to October. Eggs are deposited singly on the underside of the 
leaves to the observed number of from three to seven. This slug 
differs from the others in devouring the entire substance of a leaf, 
feeding along the edges with its body coiled beneath it, and when at 
rest remaining curled in a ball on the lower surface (see fig. 5, e). 
Upon reaching maturity the slug deserts the leaves and bores into 
the pith of the stems of dead rose bushes or other available plants, 
and here the pupal state is passed, the fall generation hibernating to 
emerge the following May. At Boston, Mass, the adults have also 
been observed in July, this indicating the first new generation. 
2A more technical description by Dr. H. G. Dyar is given in the Canadian 
Entomologist, Vol. XXVI, p. 186. 
[Cir. 105] 
