332 



COLLEGE ZOOLOGY 



piercing the tissues of plants or animals and sucking juices. 

 The mouth-parts of the honey-bee (Fig. 237) are suctorial, but 

 highly modified. In the female mosquito (Fig. 252) the labrum 

 and epipharynx combined (Lbr) form a sucking tube; the 

 mandibles (Md) and maxillae (Mx) are piercing organs; the 

 hypopharynx (H) carries saliva; and the labium (Lb) con- 

 stitutes a sheath in which the other mouth-parts lie when not 



A 



FIG. 253. Mouth parts 

 of a moth, Noctua. A, an- 

 tenna; Lr, upper lip; 

 Lt, where labial palp has 

 been cut away; MX, maxilla; 

 M xt, maxillary palp: Oc, eye. 

 (From Sedgwick's Zoology, 

 after Savigny.) 



FIG. 254. Different forms of legs of insects. 



a, predatory leg of praying-mantis, Mantis; 



b, running leg of a beetle, Carabus; c, leaping 

 leg of a grasshopper, Acridium ; d, digging leg 

 of mole-cricket, Gryllotalpa ; e, swimming leg of 

 Dytiscus. (From Sedgwick's Zoology, after 

 regne animal.) 



in use (Dimmock). The proboscis of the butterflies and moths 

 (Fig. 253, MX) is a sucking tube formed by the maxillae. 



The mouth-parts of insects arc of considerable importance 

 from an economic standpoint, since insects that eat solid food 

 can be destroyed by spraying the food with poisonous mixtures, 

 whereas those that suck juices must be smothered with gases or 

 have their spiracles closed with emulsion. 



The legs of insects are used for various purposes and are highly 



