COLEOPTERA. 547 



think that the Donaciae should form a particular family. Their he- 

 patic vessels, in number, arrangement, form and structure, consti- 

 tute a very remarkable exception to those of the Tetramera, and one 

 which even appears to be peculiar to these Insects. These vessels 

 only open into the chylific ventricle, while in all the other Tetramera 

 dissected by this able anatomist, they have two insertions, one ven- 

 tricular and the other caecal. These biliary ducts, only four in 

 number, are of two different kinds; those of the first are capillary, 

 disposed in two strongly flexed curves, and are inserted by four dis- 

 tinct ends into a short obround vesicle, situated at the inferior and 

 somewhat lateral extremity of the chylific ventricle; the others, much 

 shorter, thicker, more dilatable, thin and tapering at both ends, 

 have one extremity free, and are separately inserted by the other 

 into the superior and dorsal region of that organ. The whitish pulp 

 contained in them is considered by M. Dufour as alimentary matter. 

 The esophagus is capillary and without any dilatation in the form 

 of a crop. The chylific ventricle is roughened with very salient pa- 

 pilla?. The testes are very similar to those of the Lepturse. The 

 larvae are naked and concealed, as well as those of the last Longi- 

 cornes, an observation which strengthens the conjectures of M. 

 Dufour. 



Hjemonia, Meg. Dej. 



The Haemoniae are Donaciae in which the penultimate joint of the 

 tarsi is very small, in the form of a knot, almost entire; the last is 

 verylong(l). The 



Petauristes, Lat. 



United by Fabricius with the Lemse or our Crioceres properly so 

 called, also have very stout posterior thighs; but the eyes are emar- 

 ginated; the antennae, as in the latter, are generally composed of 

 shorter joints, and the lobes of the penultimate joint of the tarsi are 

 much less elongated and merely clasp the root of the following 

 one(2). 



Crioceris, Geoff. Oliv. Lema, Fab. Chrysomda, Lin. 



Or Crioceres properly so called, are removed from the preceding 

 by this character: their posterior legs are similar to the others, or 

 differ from them but very slightly; the antennae become somewhat 

 and gradually enlarged towards the extremity, and are almost gra- 



(1) The D. equiseti, zosterae, Fab. 



(2) The Lema varia, posticata, Fab. 



