OF THE STATE ENTOMOLOGIST. 139' 



and come to their growth within a month, when they descend into the 

 ground and become chrysalides. 



The chrysalis (Fig. G7, b) is of a deep brown or black color, very much ronghenecl, 

 and coarsely punctate or pitted like a thimble, with curved horns about the head and 

 thorax, especially at base of antenna?, a ring of sharp, conical teeth around the an- 

 terior edge of the movable joints, (stoutest dorsally), one around the middle of the 

 penultimate joint, and several irregular thorns on the apical joint, which terminates in 

 a long projection, bifurcate at tip. The movable sutures have a few coarse punctures 

 on the posterior part, and very tine longitudinal strife on the anterior part, which, at 

 the edge, has a ring of small, blunt-pointed elevations. 



In due time this chrysalis, by aid of the spines with which it is 

 furnished, works its way to the surface and gives forth the perfect 

 insect, which is a mo^t delicate moth, of a pale yellow color, shaded 

 with i^ink, as in the figure {c) which represents the female, the male 

 having a somewhat smaller abdomen, and broader, more pectinate 

 antennas. This moth may be called the Rosy Dryocampa. It varies 

 a good deal. In our western specimens the yellow predominates, the 

 rose color being but faintly visible. Ordinarily the front wings might 

 be described as rose-colored, with a yellow band running diagonally 

 across the middle, and broadest on the anterior margin. I have seen 

 eastern specimens where the rose color was quite intense on the front 

 wings, and where the hind wings, which are more generally pure yel- 

 low, have a rosy band across them. Other specimens I have bred 

 which were almost white or colorless. 



With us there are two broods of this insect each year, the first 

 brood of worms appearing mostly during the month of June, and giv- 

 ing forth the moths the latter part of July ; the second brood of worms 

 appearing in August and September, wintering in the chrysalis state, 

 and not issuing as moths till the following May. I have bred the 

 second brood from eggs laid by the first ; and last year not a worm 

 was to be found after the 15ih of September, where a week previously 

 they had been swarming. 



Dr. Harris gave to the genus, to which this moth belongs, the 

 name of Dryocampa^ meaning "oak-caterpillar," because all the 

 other species of the genus feed on oaks; and though our Maple worm 

 prefers the Soft maple, it will nevertheless feed also on Oak, as it has 

 been found thus feeding by my friend Wm. Saunders, of London, Ont., 

 and I have myself fed it on Oak in confinement. 



NATURAL EXEJUES. 



How far this insect is controlled by birds is not known, but it has 

 certain parasites which very effectually aid in this work, and whose 

 existence explains the fluctuation in the increase or decrease of our 

 Maple worm. Prominent among these parasites is the same TacMna 

 anonyma {ante p. 133} which preys within so manj^ other larvse, and 

 which has been reared by my correspondent E. A. Fapineau, of To- 



