58 GEO. H. HORN, M. D. 



terminal spur often largely developed or modified. The exceptions 

 to this rule are very few. In the Galerueini the hind tibise are very 

 often without spurs, but the absence of these spurs is less character- 

 istic of tl^ Galerueini than is their presence of the Halticini. It 

 can very readily be understood why a spur is important on a hind 

 tibia of a saltatorial insect, giving, as it does, a point of resistance 

 in the act of leaping. 



In the Halticini the general rule is that the third joint of the an- 

 tenna is equal to or longer than the fourth, while in the Galerueini 

 the third joint is usually smaller. There are, however, exceptions 

 in both sub-tribes. 



The characters have been given in the order of their importance 

 and constancy, so that by having regard for them all it seems pos- 

 sible to solve all doubtful points. 



It hardly seems necessary to enter into any detailed discussion 

 of the various characters used in classification. With one there will 

 doubtless be difficulty, which there seems no way of surmounting-. 

 The first joint of the hind tarsus plays, justly, an important role, 

 but it has been found impossible to draw any absolute line of de- 

 marcation. In cases of doubt in using the table regard must be had 

 to the aggregate of the characters of the insect after the manner 

 indicated for the separation of the higher sub-divisions. 



Chapuis, in dealing with the large number of genera, has found it 

 necessary to divide them into twenty-seven groups. Of these eleven 

 are represented in our fauna, as follows: Coelomerites, Atysites, 

 Djrabroticites, Phyllobroticites, Scelidites, Luperites, Metacyclites, 

 Agelasticites, Galerucites, Cerotomites and Sermylites, to which two 

 others have been added to accommodate some troublesome genera in 

 our fauna — Androlyperites and Phyllecthrites. In the compara- 

 tively few genera in our fauna an ordinary analytical table would 

 suffice for their separation, but for the purpose of bringing our 

 genera in relation with the best work hitherto done on these insects 

 the groups adopted by Chapuis have been indicated in the table. 



Fortunately, it has been found necessary to indicate but two new 

 genera, while four genera hitherto unknown in our fauna have been 

 introduced, — Triarius, Malacosoma, Malacorli'tnus and Luperodes, the 

 last named containing nearly all those formerly called Lvpenis. 



Galerucella is the equivalent of Galeruca Chap., which has erro- 

 neously been placed among the genera with closed front coxal cavi- 

 ties. Scelolyperus is the equivalent of Scelida Chap. 



