LITERATURE CONSULTED 

 Anderson, W. H. 



1936. A comparative study of the labium of coleopterous larvae. Smith- 



sonian Misc. Coll., vol. 95, No. 13, 29 pp., 8 pis. 

 BoviNG, A. G., and Craighead, F. C. 



1930. An illustrated synopsis of the principal larval forms of the order 

 Coleoptera. Entomologica Amer., n. s., vol. 11, 351 pp., 125 pis. 

 Carpenter, G. H., and MacDowell, M. C. 



1912. Mouthparts of some beetle larvae (Dascillidae and Scarabaeidae) 

 with especial reference to the maxillulae and hypopharynx. Quart. 

 Journ. Micr. Sci., vol. 57, pp. 373-396, pis. 35-37- 

 Crampton, C. C. 



1912. The sclerites of the head and mouthparts of certain immature and 

 adult insects. Ann. Ent. Soc. Amer., vol. 14, pp. 65-103, pis. 2-8. 

 1928. The eulabium, mentum, submentum and gular regions of insects. 

 Journ. Ent. Zool., vol. 21, pp. 1-15, 3 pis. 

 Das, G. M. 



1937. The musculature of the mouthparts of insect larvae. Quart. Journ. 



Micr. Sci., vol. 80, pp. 39-80, pis. 1-12. 

 DeGryse, J. J. 



1915. Some modifications of the hypopharynx in lepidopterous larvae. 

 Proc. Ent. Soc. Washington, vol. 17, pp. 173-178, pls. 17-19- 

 Eidmann, H. 



1925. Vergleichend-anatomische Studien fiber die Pharynx-musculature der 

 Insekten. Zool. Anz., vol. 62, pp. 49-64. 

 Janet, C. 



1899. Essai sur la constitution morphologique de la tete de I'insecte. 74 pp.. 



7 pis. Paris. 

 191 1. Constitution morphologique de la bouche de I'insecte. 35 pp., 2 pis. 

 Limoges. 

 Kadic, O. 



1902. Studien fiber das Labium der Coleopteren. Jenaische Zeitschr. 

 Naturwiss., vol. 36, pp. 207-228. 

 Riley, W. A. 



1908. Muscle attachments in insects. Ann. Ent. Soc. Amer., vol. i, pp. 

 265-269, I pi. 

 Snodgrass, R. E. 



1928. Morphology and evolution of the insect head and its appendages. 



Smithsonian Misc. Coll., vol. 81, No. 3, 158 pp., 57 figs. 

 1932. Evolution of the insect head and the organs of feeding. Ann. Rep. 



Smithsonian Inst., 1931, pp. 443-489, 25 figs. 

 1935- Principles of insect morphology. 667 pp., 319 figs. Nevir York. 

 Walker, E. M. 



1931. On the clypeus and labium of primitive insects. Canadian Ent., 

 vol. 63, pp. 75-81. 

 Williams, I. W. 



1938. Comparative morphology of mouthparts of Coleoptera. New York 



Ent. Soc, vol. 42, pp. 65-85. 



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