830 CONNECTICUT EXPERIMENT STATION REPORT, I907-I908. 



Another specimen emerged July 29th from a cocoon formed 

 July 1 6th. Thus from ten to fourteen days are passed in the 

 pupa stage. According to literature the eggs require from four 

 to six days for hatching, and the larval stage occupies about 

 twenty-five days. Chittenden finds three generations of this 

 species in the latitude of the District of Columbia, though Coquil- 

 lett found only two broods in Illinois. The moths do not appear 

 with any particular regularity, as they are found throughout the 

 latter part of the summer, specimens in the station collection bear- 

 ing dates ranging from June to November. 



Description. 



Egg. The eggs of this species were not observed by the 

 writer. Though adults were kept in the breeding cages with 

 fresh material of the food plants, all died without laying eggs. 

 Chittenden quotes* Coquillett's description in stating that they 

 are globular and flattened, with the upper half deeply grooved 

 and light in color. The average measurements showed them to 

 be 0.5 mm. in diameter and 0.35 mm. in height. 



Larva. About 25 mm. (one inch) long when fully grown, 

 about 3mm. thick in thickest portion near middle, from which 

 it tapers slightly toward the head and considerably toward the 

 posterior extremity. Color light green, striped longitudinally with 

 darker green and fine white or cream-colored lines. Head pale 

 green, shining and hairy. Thoracic legs of the same color as 

 the head. Three pairs of abdominal pro-legs in addition to the 

 anal pro-legs. Each segment bears dorsally, ventrally and 

 laterally a number of dark hairs. 



The description just given is of the caterpillar in next to the last 

 stage. In the last stage it is not striped, but nearly uniform in 

 color, paler green and stouter than in the preceding stage. The 

 larva loops in crawling, like the cabbage looper, but it is much 

 more slender, and is not likely to be mistaken for that species. 



Pupa. The first pupa obtained was formed in a pasteboard 

 box, and was enclosed in a white silken web or cocoon of rather 

 loose texture. Some larvae pupated in a rolled leaf, though others 

 went into the ground just beneath the surface and formed earthen 

 cells by fastening together particles of earth with silk threads. 



* Bulletin 30, Bur. of Entomology, U. S. Dept. of Agriculture, p. 45, 1901. 



