HEMIPTERA, ae 
of several Insects belonging to this family. The latter natu- 
ralist has not yet published the result of his investigations. 
The researches of M. Dufour are the most extensive and com- 
plete, at least so far as respects the digestive system and the 
organs of generation. A proof of this is readily obtained by 
referring to his Memoir entitled Recherches Anatomiques sur 
les Cigales, inserted in the fifth volume of the Annales des 
Sciences Naturelles: We will not follow this profound ob- 
server into the multitude of interesting details respecting 
their organization which he presents to us, and which he ac- 
companies with excellent figures, but restrict ourselves to the 
description of an anatomical character which appears to be 
exclusively peculiar to these Insects. 
In all of them, according to him, the chylific ventricle or 
stomach is remarkably long; it commences by a curved or 
straight, oblong dilatation, and always terminates in an intesti- 
niform canal, which is flexed on itself’ in order to arrive at 
the origin of this same ventricle, into which it opens by the 
side of the insertion of the hepatic vessels, not far from the 
commencement of the intestine; they all have four biliary 
vessels. In the Cicade this ventricle has the figure of an ear, 
of which the right side is dilated into a large lateral and fre- 
quently plaited pouch; its upper extremity is tied to the 
esophagus by a superior ligament, and the other leads to this 
narrow, very long, tubular, reflected prolongation which has 
the form of an intestine, and which, after these circumvolu- 
tions, reascends to join that pouch near the insertion of the 
hepatic vessels. This singular disposition of the chylific ven- 
tricle which after several convolutions empties into itself, in 
continuing a complete circle traversed by the alimentary 
liquid, is doubtless a difficult matter to explain physiologically, 
but it is not the less a well determined and constant fact, and 
one which forms the most characteristic trait in the anatomy 
of the Cicada and other Cicadariz. In the Ledra aurita of 
Fabricius, or Procigale Grand-diable of Geoffroy, the inflated 
portion of the chylific ventricle is placed directly after the 
crop, and there is but a single cluster of salivary sacs on each 
