PLATE XIII. 



Pig. 43. — Section through the first segment of the beak, a, support 

 rod; b, inner edge of beak; c, outer edge of beak; d, edge of labrum; 

 e, mandibular setae, showing opening to form a tube; /, maxillary setae, 

 showing the manner in which the two are grooved together to form the 

 tube. 



Fig. 44. — Section through the second segment of the beak, o, inden- 

 tation for support rod; 6, outer edge of beak; g, inner edge of beak; d, 

 epipharynx; e, mandibular setae; /, maxillary setse. 



Fig. 45. — Section through the middle of the third or last segment of 

 the beak, a, indentation for support rod; b, inner wall of beak; c, outer 

 wall of beak; /, maxillary sets; e, mandibular setae; m, muscles. 



Fig. 46. — Section through the tip of the beak, a, indentation for 

 support rod; c, 6, outer wall; x, maxillary setae; m, muscles. 



Fig. 47. — Cross section of the head, the plane being parallel with the 

 cephalic face, p, ring of the pharynx; x, maxillary setae; d, mandibular 

 setae; y, clypeus; m, muscles supporting the clypeus; a;s, maxillary 

 sclerite; ds, mandibular sclerite. 



