244 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 37 



the tissue of the leaf, while the maxillary stylets have together moved 

 down deep into the tissue. Puri (1924) has shown in the bedbug 

 Cimex two similar structures at the apices of the maxillary and 

 mandibular stylets, but he did not concern himself with the procedure 

 of operation by different stylets. 



ABBREVIATIONS USED ON THE FIGURES 



ADM, abductor of labium. 

 ATA, anterior tentorial arm. 

 DTA, dorsal tentorial arm. 

 hph, hypopharynx. 

 LCP, labial clamp. 

 LP, labial plate. 

 LPM, muscle of labial plate. 

 MB, mandible, 

 mdl, ML, mandibular lever. 

 MDP, mandibular plate. 

 MDS, mds, mandibular stylet. 

 Mx, tn.rs, maxillary stylet. 

 MXG, maxillary gland. 

 MXL, maxillary lever. 

 MXP, maxillary plate. 

 PLM, protractors of labium. 



PIMX, protractors of maxillary lever. 

 PMB, protractors of mandibular stylet. 

 PMD, pmd, protractor of mandible. 

 PMX, pmx, protractors of maxilla. 

 RLM, retractors of labium. 

 RMB, retractors of mandibular stylet. 

 RMD, rmd, retractors of mandible. 

 RMI, retractor of mandibular lever. 

 RMX, rmx, retractors of maxilla. 

 RMXI, retractor of maxillary lever. 

 RTM, retractors of terminal segment 



of labium. 

 SGM, muscles of salivary syringe. 

 SSG, salivary syringe. 

 TB, body of tentorium. 



REFERENCES 



AWATI, P. R. 



1914. The mechanism of suction in the potato capsid bugs, Lygus pabiilinus 

 L. Proc. Zool. Soc. London, pp. 685-734. 

 Becker, E. 



1929. The structure of the head of Rhynchota. Rev. Zool. Russe, vol. 9. 

 Butt, F. H. 



1943- Comparative study of mouth parts of representative Hemiptera- 

 Homoptera. Cornell Univ. Agr. Exp. Stat. Mem. 245, pp. 1-20. 

 Davidson, J. 



1914. On the mouth-parts and mechanism of suction in Schizoneiira lani- 

 gera. Journ. Linn. Soc, London, vol. 32, pp. 307-330. 

 DuPoRTE, E. M. 



1946. Observations on the morphology of the face in insects. Journ. Morph., 

 vol. 79, pp. 371-417- 

 Evans, K. W. 



1938. The morphology of the head of Homoptera. Proc. Roy. Soc. Tas- 

 mania, vol. I. 

 Ferris, G. F. 



1943. The basic material of insect carnium. Microentomol., vol. 8, pp. 8-24. 

 Grove, A. J. 



191 9. The anatomy of the head and mouth parts of Psylla mali . . . Parasi- 

 tology, vol. 2, pp. 458-488. 



