262 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 



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vcntricidus) begins. The chyle-stomach is about one-half as thick as the 

 crop, when the latter is distended with food, and is of nearly the same 



diameter throughout, being 

 much paler than the reddish 

 crop, and of a flesh-color. 



From the anterior end arise 

 six large gastric cceca^ the ante- 

 rior division surrounding the 

 posterior third of the crop 

 long, pea-shaped, whitish, and 

 containing a whitish, emul- 

 sion-like fluid. When dis- 

 tended, they touch each other. 

 Each caecum sends back a 

 posterior division, separated 

 by a slight constriction from 

 WJ the anterior division 5 they are 

 ^^ long and slender, and rest or 



float freely in the body-cavity, . 

 while the anterior divisions 

 are bound down to the digest- 

 ive canal. These caeca are 

 dilatations of the true chyle- 

 stomach, and probably serve 

 f/^s* to present a larger surface 

 §<. from which the chyle may 

 escape into the body-cavity 

 and mix with the blood, there 

 being in insects no lacteal ves- 

 sels or lymiDhatic system. 

 Within the anterior division 

 are from 8 to 10 longitudinal 

 folds. (In a living transpar- 

 ent dipterous larva, probably 

 one of the Mycetopldlidce found 

 living in flower-pots, we have 

 observed the digested food 

 oscillating back and forth 

 from the stomach into the two 

 large, long, simple caeca. The 

 stomach was filled with food, 

 and it appeared as if the chyle were passing into the caeca.) 



The stomach ends at the posterior edge of the fourth abdominal seg- 

 ment in a slight constriction, at which point (pyloric end) the urinary 

 tubes (vasa urinaria^ Fig. 14, ur) arise. These are arranged in 10 groups 



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