U. S. NATIONAL MUSEUM 



PROCEEDINGS VOL. 79 ART. 2 PL. 1 



Trrrtia ida. bacfiorfchs 



T. canadensis 



T. acCe/a. 



T. r7/tic//co//is 



T. nitldico/Zi's var. T. enoo/rctyons 



Species of Trirhabda 



For explanation of plate see page 36. 



T. ci'ducfa. 



