AMERICAN COMPONENTS OF THK TENTYRIIN^E 277 



American representative of Adesmta and Sleuocara^ and further 

 observation shows that in Adesniia and Craniotus we have the 

 closest approach, among the Tentyriids with large mentum, to 

 our remarkably specialized Zopherini. These facts suggest at 

 once the reversal in order presented by the following rearrange- 

 ment. The very isolated Zophosis of the old world fauna, 

 which has there no close relative, seems to have its nearest 

 neighbor in our Epitragini, which, although a generally winged 

 type, presents many suggestive resemblances, such as the pro- 

 longed prosternum and excavated mesosternum, as well as the 

 presence of two metasternal grooves before the posterior coxae, 

 the significance of which is wholly unknown. In Zophost's 

 these lines are very oblique, conforming somewhat to the un- 

 usually oblique coxae, and retreat broadly from the latter out- 

 wardly, though having the same point of origin as the trans- 

 verse grooves of Epitragini and many other of our new world 

 types, principally prevailing in those tribes characterized in 

 general by developed hind wings. The equally isolated Ero- 

 diini of the old world are passably represented by our Edrotes, 

 which should form a tribe of itself and apart from E^i^hysuy 

 because of its widely different coxae and tarsi, as well as the 

 unusual epipleurae. Such aberrant types as Chilometofon, which 

 Horn referred quite erroneously to the Epitragini, and Triniy- 

 tis^ with some of the Mexican forms recently described by 

 Champion, fall satisfactorily into a special tribe, related very 

 closely to the Eurymetoponini, and Concecus, which the sys- 

 tematist mentioned referred with equal error to the Gnathosiini, 

 is very plainly an Epitragid. The singular genus Auchniobius^ 

 which I regret being unable to observe in nature, appears from 

 the remarks published by Dr. Horn, particularly concerning the 

 aberrant mandibles and antennas, to necessitate a tribe of its own, 

 perhaps combining some of the characters of the Trimytini and 

 Eurymetoponini. 



With these preliminary remarks the arrangement of the tribes 

 represented by material known to me may be presented as 

 follows : — 



Mentum very large, concealing both ligula and maxillae 2 



Mentum generally smaller in size, never concealing both the ligula 

 and maxillae 14 



