472 CALIFORNIA ACADEMY OF SCIENCES. 



ACTIUM Casey. 



Through the kindness of Herr Reitter, of Modiing, Aus- 

 tria, who has sent me several representatives of Trimiopsis, 

 I am enabled to give the following statement, showing the 

 relationship of the latter with Actium, Trimiopsis being 

 represented Dj 1. Ejgersi. 



The maxillary palpi of Trimiopsis are long, the fourth 

 joint being more strongly dilated internally near the base, 

 and therefore distinctly securiform ; while in Actium, as rep- 

 resented by pallidum, the palpi are shorter, more robust, and 

 with the outer joint ovoidal and acuminate. In T. specu- 

 laris, however, the palpi are more robust and do not differ 

 so greatly from the form existing in Actium. 



One of the most conclusive differences, however, is the 

 presence of a distinct discal stria, extending for one-half to 

 two-thirds the elytral length in Actium, and the complete 

 absence of this stria in Trimiopsis. 



In Trimiopsis the isolated fovea at the base of each ely- 

 tra, between the discal and sutural striae, which is a con- 

 stant character of Actium, is completely wanting. 



Several species of Trimiopsis have two basal abdominal 

 carinse, these being very widely distant in T. specularls; 

 others, however, — eg. Eggersi — are entirely devoid of the 

 basal carinse. In Actium the basal carina3 are distinct and 

 rather approximate. 



The species of Trimiopsis are much smaller than those of 

 Actium, and have the head relatively much larger. 



Actium also appears to resemble, to some extent, the 

 much more minute African species, recently described 

 under the name Periplectus by Raffray, 



It is probable that the species described from the east- 

 ern parts of the United States under the name Trimium 

 might more appropriately be referred to Trimiopsis, as the 

 European genus Trimium has not yet been discovered with- 

 in our territories. 



