316 



SCHOOL ENTOMOLOGY 



limb. These usually belong to this species. The yellow- 

 necked apple caterpillar is about two inches long, with a 

 black head and the next segment a bright orange-yellow; 

 down the middle of the back runs a black stripe and 

 on either side of the body are three stripes of black 

 alternating with four of yellow. If the limb is jarred or 



a caterpillar is touched, 

 it at once assumes a 

 characteristic position, 

 throwing the head and 

 tail into the air with a 

 jerk and clinging to the 

 limb with the pro-legs, 

 as shown in Fig. 230. 

 The caterpillars become 

 grown in four or five 

 weeks and then enter 

 the earth for from 2 

 to 4 inches, where they 

 transform to naked 

 brown pupae. The 

 moths emerge the next 

 FIG. 230. The yellow-necked apple y ear f rom M av ^ o July, 

 caterpillar (Datana ministra Dru.); and the ^^ j 

 mature larvae and moth natural size. 



their eggs in masses 



on the foliage during midsummer. The moths have a 

 wing expanse of about two inches, the fore wings being a 

 reddish-brown color crossed by three to five darker lines, 

 and the head and thorax being chestnut brown. 



161. The Pear Slug* (40). The pear slug is an old 

 European pest which is now found throughout the United 

 States and in many parts of the world. Its work is usually 

 * Caliroa cerasi Linn. Family Tenthredinidce, see page 155. 



