26 



PRACTICAL ZOOLOGY 



parts of the mosquito (Fig. n, A) may serve as an example of 

 the sucking mouth parts. The upper and lower lips form a 

 tube in which the long, sharp mandibles and maxillae move 

 when a puncture is made. The juices are drawn into the ali- 

 mentary canal by the suction 

 caused by a muscular enlargement 

 of the oesophagus. In some suck- 

 ing insects there is a special 

 reservoir, called a sucking stomach 



B 



FIG. ii. A, mouth parts of a mosquito. 



H, hypopharynx ; Lb, lower lip ; Lbr, upper lip ; Md , mandible ; MX, maxilla. 

 (After Becker.) 



B, internal anatomy of a moth showing the proboscis (Mx) and sucking 

 stomach (V). (After Newport.) 



(Fig. n, B, V'}, in which juices are stored until needed. The 

 sucking apparatus of the butterflies and moths differs from that 

 of the mosquito. Here the maxillae are very long, forming a 

 tubelike proboscis (Fig. n, B, MX) which is coiled beneath 

 when not in use, and the jaws are extremely small or 

 entirely absent. 



