3o8 NEW YORK STATE MUSEUM 



excrement on the foliage below. They were so abundant that leaves 

 covered with the little pests were easil}- found. The portion of the foliage 

 on which the eggs were laid was usually untouched though everything 

 else, and the adjacent leaves had been eaten. The small caterpillars at this 

 time were about ^_^_ inch long, and larger, darker ones, about j4 inch in 

 length, were also observed. A lot of these latter were placed under obser- 

 vation and July 23, another molt occurred. The caterpillars were then coal- 

 black, with bright red longitudinal stripes, and the thoracic horns consider- 

 ably longer than in the preceding stage. July 27, caterpillars in at least 

 three different stages were easily found at Karner, entire shoots had been 

 defoliated and the younger caterpillars were frequently clustered on the 

 under surface of the leaves. The larger larva at this time measured about 

 I inch in length. Sep. 6, practically all the larvae had transformed to 

 pupae. Dr Lintner has given the following as a summary of the life history. 

 He states that they molt four times, the average period between each being 

 about 9 davs. Oviposition e.xtends over a period of 3 or 4 weeks, conse- 

 quently larvae may be found in several stages. Notes made by him in 1869 

 show that on Aug. 20, the larvae were small, some passing through their 

 fourth molt and others in their last stage. Aug. 27 some were full grown, 

 Sep. 8 mature larvae were found wandering prior to pupation, on the 14th, 

 full grown larvae were still abundant, and on the 30th a few were seen. 

 He states that the larger number probably enter the ground for pupation 

 during the second and third weeks of .September. They- bury themselves 

 to a depth of 3 or 4 inches and make a simple cell in which the final 

 transformations take place. 



Description. The moth is a bright reddish yellow color, with its front 

 wings specked with black dots, and a large white spot near the middle. 

 The female has an expanse of about 2'^ inches, and the male about i}4. 

 The latter is darker in color, and has the antennae broadly pectinated for 

 more than half their length. 



The following description of the larval stages is taken from Dr Lint- 

 ner's account. 



