THE CANADIAN ENTOMOLOGIST. 43 



now perfectly inactive, and behaves as if dangerously ill. This state of 

 things lasts for a couple of days, during which time the larva has com- 

 pletely changed its skin, and gathered strength for future labor. 



On thrifty plants of the red currant growing in the sunlight, develop- 

 ment is very rapid ; whereas, caterpillars feeding upon plants growing in 

 the shade, exhibit the most remarkable contrasts, even in the same brood. 

 The latter are more slender, being one-eighth of an inch shorter, darker, 

 and have olive-green constrictions. The head and tubercles are an obscure 

 black ; the body bands much darker. From careful watching I am satis- 

 fied that they pass into their next stage without the necessity of moulting. 



June 1 8th — The caterpillar has changed its skin again. It now 

 measures from seven-eighths to one inch in length. The time of changing 

 apparently varies from five to eight days, depending upon individual 

 vigor. 



The general color, at first, is a light yellowish-green. The tubercles of 

 the first somite have each a dark basal annulus, and a pale blue summit 

 which is surmounted by seven black spines, six in a circle and the 

 remaining one occupying an apical position, from which it projects either 

 vertically or obliquely ; the remaining tubercles upon the first segment are 

 jet black, and^ furnished with six spines. The second and third 

 series of dorsal tubercles are a deep flesh color, with spines similar in 

 number and position to the foregoing. The 4th, 5th, 6th, 7th, 8th, 9th 

 and loth somites have lemon-colored tubercles, with black, longitudinal 

 dashes, facing laterally ; and the nth segment is armed with one large 

 tubercle, occupying a median dorsal position, which is surrounded by a 

 circle of seven spines near the middle, and overlooked by two 

 divergent terminal ones. 



The lateral tubercles of the 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, loth 

 and nth segments,are glistening and bluish. The 2nd and 3rd are armed 

 with six encircling spines, and one apical ; while the others, with five, and, 

 sometimes, six encircling spines. Each tubercle is marked with longi- 

 tudinal dashes on both sides, or merely on the dorsal side. The 12th 

 segment has four light blue tubercles, armed with six spines. Above the 

 anal pro-legs, two light blue tubercles are visible, which are furnished 

 with six black glossy spines in a circle, and two broad lateral dashes. 



The four abdominal pro-legs have each a broad, irregular, quadrangular 

 black patch, near the distal extremity, and a small semi-elliptical one near 



