32 



HOMOPTERA 



dissected, show a much simpler form of food tube the parts of which are diagrammatically shown in 

 the accompanying text figure. 



Crop 

 -rf/fer cAamber 



Ascending 

 /n/c/-/nfesfine 



-Smo// /nfesf/ne 



-Ur/nary fubu/e 



Recfam 



FiG. 6. — The alimentary eanal 



This type is noticeably dififerent from that described by Kershaw particularly in the number 

 and position of the urinary tubules. The alimentary canal is short and twisted and the various parts 

 are strikingly distinct in size and structure. The short esophagus opens directly into the crop, which 

 is very large and has a peculiar twist at its center. At the posterior end of the crop the canal is much 

 narrowed to form anascending mid-intestine, which bends abruptly anteriorly, is irregularly coiled and 

 twisted, and extends forward as far as the center of the crop. At the end of the ascending mid-intestine 

 is a knot from which arise two urinary tubules; each of these tubules has a bUnd end projecting a 

 short distance cephalad, while the tubule itself extends along the fuU length of the small intestine, 

 and joins the rectum by the side of the small intestine. From the knotted end of the mid-intestine 

 arises the small intestine, which is very narrow in diameter and almost straight. The small intestine 



