PROC. ENT. SOC. WASH., VOL. 23, NO. 3, MAR., 1921 61 



supports of the spiracular plate which originate from the wall of the 



spiracular atrium); Trach, trachea. 

 Fig. 3. Small, highly magnified part of the stridulating area of mandible, 



showing the form and arrangement of the granules. 

 Fig. 4. Left mandible, ventral side, with stridulating area. 

 Fig. 5. Terminal part of respiratory plate, showing form and arrangement of 



the holes of the plate; highly magnified; external view. 

 Fig. 6. Right maxilla, ventral surface; showing sensorial area of apical joint 



of palp; completely fused lacinia and galea; the two lacinia teeth and 



the galea tooth; bidivided cardo; articulating area between maxilla 



and submentum. 

 Fig. 7. Epipharynx; four anterior asymmetrically placed small hooks; lateral 



margin with transverse stnations. 

 Fig. 8. Right mandible. 

 Fig. 9. Left mandible. 

 Fig. 10. Diagram showing the way in which the molar parts of right and left 



mandibles fit together. 

 Fig. 11. Right mandible. 

 Fig. 12. Side view of larva. 

 Fig. 13. Ventral surface of mandibles and hypopharyngeal chitinization; hy, 



supplementary ventral condyle of mandible; fossa in hypopharyngeal 



chitinization receiving supplementary condyle of mandible; 1, exterior 



and lateral part of mandible; lin, glossa; m, manducatorial ( = mola 



bearing) part of mandible; o, stridulating, oval organ of left mandible; 



oo, same of right mandible; s, scissorial ( = cutting) part of mandible. 

 Fig. 14. Dorsal surface of maxillae, glossa (lin), hypopharyngeal chitinization, 



pharynx and wide entrance to oesophagus (oe). 

 Fig. 15. Terminal portion of tenth abdominal segment. 

 Fig. 16. Second and third pair of legs. 



Plate VI. 



POPILLIA JAPONICA Newman and "STRIGODERMA ARBORICOLA 



Fabricius?" 



Fig. 17. Popillia. Malae ( = fused lacinia and galea) of left maxilla, innerside, 



viewed from buccal cavity: gt, galea-tooth; It I and It 2, lacinia-teeth; 



ps and vs, large setae. 

 Fig. 18. Popillia. Dorsal surface of head: s, scissorial part of mandible; 



1, lateral part of mandible. 



Fig. 19. "Strigoderma?" Dorsal surface of head. 

 Fig. 20. "Strigoderma?" Malae of left maxilla; view as fig. 17. 

 Fig. 21. Popillia. Posterior part of dorsal surface of right maxilla, exhibiting 



creaking teeth of stridulating organ. 

 Fig. 22. "Strigoderma?" Same view as fig. 21. 

 Fig. 23. Popillia. Posterior part of ventral side of tenth abdominal segment: 



loa, lower anal lip; ua, upper anal lip; ti, transverse impression between 



the two ends ot anal slit. 

 Fig. 24. Popillia. Molar structure of right mandible: a, dorse-posterior angle 



