HEMIPTERA, 117 



anyl, or the formate of anylic ether. The broad, flat- 

 tened abdomen (PL V., Fig. 64, C) is connected with 

 the thorax by a broad junction, and is concave above 

 and convex below. The spiracles are situated along 

 the lower sides. The mode of breathing of the squash- 

 bug is similar to that of the cockroach (see p. 102). 



The squash-bug has a pair of small compound eyes 

 (PL v.. Fig. 66, two-thirds view of head, ey ; PL V., 

 Fig. 67, side view of same, ey) and two ocelli (Fig. 

 67, oc^). These are seen, but not lettered, in PL V., 

 Fig. 64. The foremost appendages are the long, stout, 

 and jointed antennae (Fig. 64, at), the first and last 

 sections of which are enlarged. Below these are the 

 labrum (PL V., Figs. 66, 67, la) and sucking- tube 

 (PL v., Fig. 64, SI/), which extends from the front of 

 the head backward, close to the lower side of the 

 body (PL v., Fig. 65, sii). The two parts forming 

 the second pair of maxillae are united here as in the 

 locust and dragon-fly, but instead of forming an apron- 

 shaped organ, they make a long, jointed, and deeply 

 grooved tube (PL V., Fig. 66, mx"). The other two 

 pairs of mouth parts are modified from biting-organs 

 to sharp needle-like piercers (Fig. 66, md, inx^). 

 When the labrum is lifted these organs are raised with 

 it, as shown in Fig. 66. The mouth parts of this insect 

 are so small that scholars have much difficulty in 

 making them out, and are often uncertain as to their 

 number and homologies. In this case one of three 

 things must be done. The teacher must tell his pupils 

 some of the facts, or he must resort to a blackboard 

 drawing which places the organs at once before the 

 pupils without any effort on their part, or he must 



