NORTH AMERICAN COLEOPTERA. 57 



THE GALiERUCINI OF BOREAL. AMERICA. 



BY GEORGE H. HORN, M. D. 



The essay of Dr. LeConte published in the Proc. Acad. 18G5, pp. 

 204-222, was intended as a Prodromus of a more extended work 

 when the accumulation of material would have made the work more 

 perfect as to the species themselves, and a more nearly complete as 

 to t1ie contents of our fauna. In the same journal, in 1873, Crotch 

 published a few notes on the tribe. Since the work of LeConte a 

 small number of species have been described. 



In 1875 the eleventh volume of the "Genera" appeared from the 

 able hand of Chapuis, and which formed the basis of the table of 

 genera given in the " Classification of the Coleoptera of North 

 America." 



The Galerucini treated in the following pages form one of the two 

 divisions or sub-tribes, into which the tribe Galerucini is divided by 

 all recent authors in the following manner : 



Hind thighs sleuder, adapted for walking GALERUCINI. 



Hind thighs thickened, adapted for leaping HALTICINI. 



This distinction is ample for those with some entomological tact, 

 whose experience in a general way will enable them to place doubtful 

 forms in their approximately correct relationship, but it must be 

 admitted that forms will occasionally present themselves in which 

 the aof^regate of an insect's structure must be sfiven weight when 

 characters that are considered more especially distinctive fail. 



The femoral characters is without doubt the most constant, and 

 least liable to give rise to doubt. There are, however, some Gale- 

 rucini in which the thighs are quite as much thickened as in some 

 Halticini. An instance in which the hind thighs of one of the latter 

 group are scarcely thickened will be treated in a supplement to the 

 present essay. 



As a rule, the anterior coxs^e are separated in the Halticini and 

 contiguous in the Galerucini, but exceptions occur in both sub-tribes, 

 although the characters may be said to have value next to that drawn 

 from the femora. 



The hind tibise in the Halticini are nearly always provided with a 



TRANS. AM. ENT. SOC. XX. (8) APEIL, 1S93. 



