90 



MANUAL OF GENEEAL AGEICULTURE. 



like appendages : onej the galea, Fig. 13 gl, is more or less 

 spoon-shaped, the other 

 the lacinia, Fig. 13/lc, 

 pointed and with /two 

 teeth. The galea and 

 lacinia aid in holding 

 the food in the mouth, 

 where it can be crushed 

 by the mandibles and 

 masticated. Each max- 

 illa also bears on one 

 side a five-segmented 

 feeler or palpus (plural 

 palpi), the maxillary 

 palpus. The hypophar- 

 ynx is a small tongue- 

 like structure situated 

 in the mouth and at- 

 tached to the inner sur- 

 face of the lower lip. FlG 13 ._ rfc /^. pa ; to of a locw t. 

 big. Id hy. Ihe lower /, labrum; md, mandible; hy, hypo- 

 lip or labium, Fig. 13 Ib, pharynx; mx, maxilla; mp, maxillary 

 in the locust and Other palpus; gl, galea; Ic, lacinia; Ib, la- 

 insects consists of a ^ium; lp labial palpi; pg f paraglos- 



, . ., . sae; g, glossa. 



single piece; it is in 



reality a pair of jaws similar to the maxillae grown 

 together on the middle line. The labium bears on each 

 side a three-segmented feeler or palpus, the labial palpus, 

 Fig. 13 Ip, and at its apex two large, more or less squan; 

 flaps, the paraglossae, Fig. 13 pg, and at the bottom of the 

 slit between the paraglossae, a minute projection, the 

 glossa, Fig. 13 g. The glossa in the locust is rudimentary, 

 but in many biting insects it is as long as the paraglossae, 

 and, as will be seen later, forms an important part of the 

 mouth of sucking insects. Detach and draw the parts 

 shown in Fig. 13. 



The mouth-parts of the locust illustrate well the form 

 and arrangement of the parts in the mouth of biting in- 



