Bacteria Normal to Digestive Organs of Hemiptera. 5 



wrapped around the stomach, and imbedded in fatty 

 tissue in a way to require careful dissection for their dis- 

 play. The tube-like structures of which these leaflets are 

 composed are thickest distally, and are attached by their 

 narrow ends to the alimentary canal, which in the first 

 lobe is indistinguishable from the edge of the sheet itself. 

 This anterior sheet is irregularly palmate, the longest of 

 the finger-like coeca measuring 1.1 mm. and the shortest 

 (those most posterior) about .7 mm. The transverse di- 

 ameter of a single coecum at its broadest end is about 

 .07 mm. This lobe is partly folded together, the folds 

 being held in place by branches of a large trachea, which 

 is distributed abundantly to all parts of the structure. 



The second or smallest lobe is attached to the intestine 

 by a narrow insertion about ,1 mm. behind the preced- 

 ing. It is .5 mm. long by about .2 wide. 



The third lobe, of medium size, is also attached by a 

 narrow insertion to the intestine immediatelj' beyond the 

 preceding. It is quite regularly palmate in form, is sup- 

 plied by a single much-branched trachea, and measures 

 about .7 mm. long by .5 wide. 



Crushing successively and separately all the portions of 

 the alimentary canal upon cover-glasses, and treating 

 by the usual methods for the demonstration of bacteria, 

 I found all the preparations quite free from them, with 

 the exception of those from the above-described leaf-like 

 coecal structures; and in these, and in every part of them, 

 immense numbers of a minute Micrococcus occurred (not 

 M. insectorum) , situated, as in the chinch bug, chiefly be- 

 tween the large spherical cells of which these bodies were 

 principall}^ composed. Several repetitions of this exper- 

 iment with other specimens gave the same result. In 

 Trapezonotus this organ has the same structure and 

 general appearance as in Myodoclia serripes. 



Among the Coreidse I have seen it in Anasa tristis, 

 AJydtis pilosulus^ and A. eurinus, but hfive found nothing- 

 resembling it in Corizus lateralis. In this family it has a 

 much more considerable extent than in the foregoing, 



