Kansas University Science Bulletin. 



Vol. II, No. 9. 



NOVEMBER, 1903. 



<t Whole Series, 

 (Vol. XII, No. 9.. 



ON THE MOUTH-PAETS OF THE HEMIPTERA. 



BY WALTER .J. MEEK. 

 With plates VII, VIII, IX, X, and XL 



n^HE general structure of the hemipterous mouth was known 

 to Savigny, but only in recent years has detailed work on the 

 subject been attempted. In 1883 Otto Geise* presented a paper 

 on the mouth-parts of some Hydrocorisse, and in 1885 Herman 

 Wedde published a similar one on the Geocorisse. Two years 

 later Leon studied the mouth of Pentatoma. In 1902 Smith ad- 

 vanced an explanation for the morphology of the hemipterous 

 mouth, and later these views were commented upon by Marlatt. 

 Heymons, in 1899, wrote on the morphological history of the 

 Hemiptera. 



Geise in his work discusses and illustrates clearly the mouth- 

 parts of Notonecta glauca, Nepa cinerea, and Corixa striata. He 

 advances nothing new as to the morphology of the parts. The 

 pharynx or " Schlundkopf " and the " Wanzenspritze," which 

 we shall term the salivary injector, are carefully discussed. 

 The pharynx is composed of the well-developed epipharyngeal 

 and hypopharyngeal lamella?. The latter is greatly modified, 

 having many cutting and grinding processes, evidently used in 

 preparing the food. The muscles that raise the epipharynx are 

 arranged in groups. The structure of the injector is more neariy 

 constant in the three forms than that of any other organ. 



For his investigations Wedde selected Pyrrocoris aplerus. He 

 describes the pharynx as being a simple unmodified tube. In 

 is supported and fastened to the head walls by a complicated 



* For this and the following references, see bibliography at the end of this article. 



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