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 maxilla; 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 



V'l iff 



Fig. ii. — A, mouth parts of a mosquito. 



II, hypopharynx ; Lb, lower lip ; Lbr, upper lip ; Md, mandible ; Mx, maxilla. 

 (After Becker.) 



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

 stomach (V). (After Newport.) 



(Fig. ii, 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 arc extremely small or 

 entirely absent. 



