NORTH AMERICAN COLEOPTERA. 197 



From the above table it will be seen that we now have nineteen 

 genera of Eiiniolpini against fourteen given in the " Classification." 

 Six genera previously unknown or omitted, have been added : Co- 

 laspidea, Eumolpus, Rhabdopterus, Metaxyonycha, Colaspoides and 

 Nodonota, while Tricotheca has been suppressed, as not distinct from 

 Xaidhonia. 



The nineteen genera represent twelve of the twenty-one groups 

 into which Chapuis divided the tribe and thirteen of the twenty-five 

 subsequently recognized by Lefevre. The discrepancy in the num- 

 ber of our groups arising from the fact that Lefevre has divided the 

 Iphimeites of Chapuis separating the Chrysodinites by characters 

 not appreciable in our material. Of the nineteen genera, Graphops 

 and Metaparia are at present peculiar to our fauna. 



An arrangement of our genera in the order given in the table 

 would seem very unnatural in a cabinet. The following order is 

 suggested and explained by arranging in parallel columns the genera 

 of the two series into which the Eumolpini are at i)resent divided: 



Thorax vrith post-ocular lobes. Thorax without post-ocular lobes. 



1. Adoxus {Adoxites). 2. Fidia (Leprotites). 



3. Xanthonia. 



4. Myochrous (Myochroites). 



5. Glyptoscelis. 



6. Colaspidea. 7. Graphops (Scelodontites). 



8. Ty pophoras (Typophorites). 9. Metachroma (il/e<((c/trom27ea). 



10. Cbrysochus {Corynodites). 11. Eumolpus (EumolpHes). 



12. Tymnes (Edusites). 13. Colaspis (Colaspites). 



14. Ehabdopterus. 



15. Metaxyonycha. 



16. Colaspoides (EndocephalUes). 17. Nodonota (Iphimeites). 



18. Metaparia. 



19. Chrysodina. 



By such an arrangement no violence is done to the relationship 

 of the genera of the various groups. The names in italics here, as 

 in the table, indicate the group names of Chapuis and Lefevre. 



ADOXUS Kby. 



The only known species of this genus inhabits Europe and the 

 northern portion of our own continent, varying in a similar manner 

 in both regions. 



The most recent description of the species by Weise is as follows : 



A. obscurtis Liun. — Niger, subopacus, teiiuitcr albido-pubesceus, anteiinis 

 basi ferrugineis, elytris sat crebre subtiliter punctatis striis puiictoruni luajoruni. 

 Long. 5 — 6 mm. 



TRANS. AM. ENT. .SOC. XIX. JULY, 1892. 



