NO. 13 LABIUM OF COLEOPTEROUS LARVAE — ANDERSON 27 



ABBREAaATIONS USED ON THE FIGURES 



ACd, apodeme of cardo. LbPlp, labial palpus. 



adcd, adductor of cardo. Lig, ligula. 



adlb, adductor of labium. Ipip, labial palpus. 



adsf, adductor of stipes. MAiit, antennal muscle. 



AT, anterior arm of tentorium. Mf, mentum. 



at, anterior tentorial pit. Pgl, paraglossa. 



b, secondary sclerite of prementum in Pip, palpus. 



Periplaneta. Pint, postmentum. 



Cd, cardo. pos, postoccipital suture. 



Cvx, neck, cervix. Prmt, prementum. 



dplp, depressor of palpus. IPnitf, anterior subdivision of pre- 



DT, dorsal arm of tentorium. mentum. 



fgl, flexor of glossa. UPrmt, posterior subdivision of pre- 



For, foramen magnum. mentum. 



r^ , a c 1 PT^, posterior arm of tentormm. 



fpgl, fiexor of paraglossa. ^^ \ ■ ^ ^ • 1 -^ 



pt, posterior tentorial pit. 



' ^ ■ rhphy, retractor of hypopharynx. 



gs, gular suture. ^^^^ retractor of prementum. 



Cu, gula. Smt, submentum. 



gu, much narrowed gula. St, stipes. 



HB, hypopharyngeal bracon. TB, cross bar of tentorium. 



Lb, labium Tcrxt, tentorium. 



REFERENCES 



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



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



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



Ckamptox, G. C. 



1 92 1. The sclerites of the head, and the mouth parts of certain immature 

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



Kadic, Otokar 



1902. Studien iiber das Labium der Coleopteren. Jenaische Zeitschr. Natur- 

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KORSCHELT, E. 



1924. Bearbeitung einheimischer Tiere. Der Gelbrand Dytiscus margi- 

 nalis L., vol. 2, p. 510. Leipzig. 



Sxodgrass, R. E. 



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Smithsonian Misc. Coll., vol. 81, no. 3, 158 pp., 57 pis. 

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



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

 1935- Principles of insect morphology. 667 pp., 319 pis. New York. 



Walker, E. M. 



193 1. On the clypeus and labium of primitive insects. Canadian Ento- 



mologist, vol. 63, pp. 75-81. 



