24 MASS. EXPERIMENT STATION BULLETIN 239 



ill late April and very early May, placing them in masses of sometimes over 

 a hundred on the stems or the backs of the leaves of cranberry ui)rii;hts {i\<x. 

 23). The eggs are whitish at first but soon turn light yellow and later he- 

 come reddish brown. They are about a thirty-lirst of an inoli in diameter. 

 They hatch during the second and third week of May, the egg stage lasting 

 lifteen to twenty days. 



The ]Vorni. 



The newly hatclied worms (lig. 24.) are wliitisii and marked v\ith many l)iack 

 spots each of which bears a slender black spine, these being conspicuous under 

 a lens. They loop much like spanworms but gradually droj) this movement. 

 They soon become green with whitish lines along the i)ack and sides, being 

 somewhat darker above than below, and retain this coloration till over a 

 third grown. 



The mature caterpillar (Plate Two, tigs. 7a, 7b, 7c and 7(1) is about two 

 inches long and its head is uniform greenish jellow. Though tlie arrange- 

 ment and relative widtli of the various stripes and lines along the i)ody are 

 the same in all specimens, the general color \aries from grass green to dark 

 brown. The stripes are as follows: a broad band of varying color runs tlie 

 length of the back and is divided in the middle lengthwise by a light line; this 

 t)and is bordered on each side by a yellowish line; below this line on each side 

 is a nnich lighter stripe extending nearly down to the s])iracles; across the 

 spiracles passes a blackish line which is bordered below liy a. sidfur yellow 

 one. There are light dots at intervals along the back. The body is greenish 

 or flesh-colored lieneatli. 'I'he spiracles are or;inge, ringed witli deep brown. 



The Pupa. 



The worms mature in late Jime and go into tlie groimd to remain dormant 

 two to six weeks before pupating. They pupate mainly in late July and early 

 August. The pupae are stout, about an inch long, and dark brown. 



The Moth. 



The moths emerge from mid-August till late September. They are (Plate 

 One, fig. 13) light coffee brown with the body reddish sooty brown below and 

 on the back between the wings. The top of the head, the collar, and the abdo- 

 men above are pale yellowish brown. The fore wings are variegated, with 

 brown, gray and sooty streaks above and are light brown below. The hind 

 wings are pale brown with a conspicuous dark spot somewhat before the 

 middle and toward the base on the under side. The wings ex})and two inciies 

 or more. 



Treat)nenf. 

 Flooding. 



On tcinter-flo'ived hoys scant of icater for reflvodhuj : — Hold the winter 

 water rather regularly till May 22. This preventive has other advantages. 

 (See p. 11). 



