42 



MASS. EXPERIMENT STATION BULLETIN 353 



pillar, Datana inlegerrima, and others of the genus Datana, has the peculiar habit 

 of elevating both ends of the body when disturbed. 



Yellow-Necked Caterpillar 



1. Caterpillars on apple twig. Actual size. 



2. A characteristic cluster of caterpillars. Reduced. Courtesy, N. H. .\gr. Expt. Station. 



3. Adult female and male moths. 



Figs. 1 and 3, Courtesy, Conn. Agr. Expt. Station. 



Description. The moths closely resemble those of the walnut caterpillar, and 

 it is difficult to distinguish one species from the other. 



The eggs are found in masses of about 100 or more on the under side of the 

 leaves. They are very small, oval, and white. 



The mature caterpillars are about 2 inches long. The head is jet black. The 

 body segment just behind it (the prothorax) is a bright orange-yellow, a character 



