coleoptmra. 559 



C. populi, L.; Oliv., lb., VII, 110. Length from five to six 

 lines; oval, oblong, and blue; elytra fulvous or red, and the inner 

 angle of their extremity marked with a black dot. On the Wil- 

 low and Poplar; its larva lives on the same trees, and frequently 

 in society. 



This species, and some others equally oblong, with a thorax 

 narrower than the elytra, and forming a transversal square 

 thickened on the sides, constitute the genus Lima of Megerle(l). 

 We will terminate this tribe with those Chrysomelinae whose max- 

 illary palpi are attenuated at the extremity and terminated in a point. 

 They will form two subgenera. 



Ph.<edon, Colaphus, Meg. 

 Where the body is ovoid or orbicular(2), and 



Prasocuris, Lat. Helodes, Fab. 



Where the body is narrower, more elongated and almost a paral- 

 lelopiped, and where the diameters of the thorax are nearly equal. 

 The four or five last joints of the antennae are dilated, and almost 

 form a club(3). 



In the third and last tribe of the Cyclica, that of the Ga- 

 lerucit^e, we find antennae always at least as long as the half 

 of the body, of equal thickness throughout, or insensibly 

 thicker towards their extremity, inserted between the eyes, 

 at but little distance from the mouth, and usually approxi- 

 mated at base, and near a small longitudinal carina. The 

 maxillary palpi, thickest about the middle, terminate in two 

 joints, in the form of a cone, but opposed or united at base, 

 the last short, and either truncated or obtuse or pointed. The 

 body is sometimes ovoid or oval, and sometimes almost hemis- 

 pherical. In several, and particularly the smaller species, the 

 posterior thighs are very stout, which enables them to leap. 



This tribe is composed of the genus 



(1) Seethe Catalogue, &c, of Dahl. 



(2) See the Catalogue of Dahl, but add to it certain Chrysomelx, such as the 

 following: raphani, vitelline, polygoni, &c. The antennae of the species called 

 armoraciae, cochlearias, in the thickening of their terminal extremity, closely ap- 

 proach those of the Helodes. 



(3) See Lat., Gener. Crust, et Insect, HI, p. 57, Fabricius, Olivier, Schoenherr, 

 and Gyllenhall. To the species quoted, add the aucta, marginella, hannoverana. 



