NORTH AMERICAN COLEOPTERA. 59 



Of the genera in the following table the following are thus far 

 peculiar to our fauna : Halticidea, Trachyscelida, Androlyj^enis, 

 Phyllecthrus and Andredor. 



Chapuis arranges the tribes as they occur in our fauna in the fol- 

 lowing order : Phyllobroticites, [Phyllecthrites], Diabroticites, Agel- 

 asticites, [Androlyperites], Scelidites, Luperites, Atysites, Coelonie- 

 rites, Metacyclites, Galerucites, Serraylites and Cerotomites. It 

 seems, however, that the arrangement produced by the analytical 

 table gives quite as satisfactory results in the cabinet. 



The following arrangement is the one proposed for our genera : 



Anterior coxal cavities open behind 2. 



Anterior coxal cavities closed behind 8. 



2. — Claws of tarsi bifid (simple in 9 Monoxia) 3. 



Claws of tarsi appendiculate 4. 



3. — Tibise without terminal spurs. 



Epipleurte short, scarcely passing the middle of the elytra (Ccelomerites). 



Outer edge of tibise deeply sulcate Moiiocef^ta. 



Outer edge of tibise feebly cariuate HalticMlea. 



Epipleurae long, reaching nearly the apices of the elytra (Atysites). 

 Tarsal claws similar in the sexes, deeply bifid ; antennae longer than 

 half the body. 



Third joint of antennse shorter than the fourth Trirliabda. 



Third joint longer than fourth Gitlerucella. 



Tarsal claws unlike in the sexes, narrowly bifid in males, simple iu 

 females ; third joint of antennse longer than the fourth ; antennge 



not reaching the middle of body IVIoilOxia. 



Tibise with terminal spurs (Diabroticites). 



All the tibise with terminal spurs; outer edge rounded Triariiis. 



Anterior tibise without spurs ; outer edge more or less carinate. 



Diabrotica. 



4. — Epipleurse not distinct (Phyllobroticites) Phyllobrotica. 



Epipleurse well defined 5. 



5.— First joint of hind tarsi slender, always longer than the next two, and some- 

 times longer than the next three 6. 



First joiut of hind tarsi rather stout, sometimes as long as the next two, 



usually shorter 7. 



6. — First joint of hind tarsus decidedly longer than the next two, and in most 

 cases equal to the three. 

 All the tibiae without spurs (Scelidites). 



Form elongate, parallel, anterior coxae contiguous.. ..Scelolyperus. 

 Form broadly oval and convex, anterior coxae narrowly separated. 



Trachyscelida. 

 Tibise with spurs, at least in part (Luperites). 



All the tibise with spurs L<uperodes. 



First joint of hind tarsus equal to the next two and nearly as stout (Andro- 

 lyperites). 



TEANS. AM. ENT. SOC. XX. APRIL, 1893. 



