AMERICAN COMPONENTS OF THE TICNTYRIIN^ 469 



ion, evidently having the large rounded flattened apical tuber- 

 cles of that genus, and not the small and oblique ridges of 

 Zopherodes. 



Tribe Nosodermini. 



The radically different structure of the ligula and labial palpi 

 would alone necessitate the tribal separation of Nosodcrma and 

 allied genera from Zophcrus, but, in addition to this, the entire 

 facies of the body and style of sculpture are strikingly differ- 

 ent and the mandibles, instead of being truncate at tip as in the 

 Zopherini, are deeply bifid, although, in view of the variability 

 of this character in some other tribes, such as the Epitragini, it 

 might be regarded as subsidiary in value ; it is however more 

 constant and apparently more significant in this part of the 

 series. The genera or, in some cases perhaps more properly 

 subgenera, are numerous, and the nine here indicated are only 

 a part of them. Most of these minor groups possess very marked 

 and unequivocal distinctive characters, and it undoubtedly be- 

 comes necessary to indicate them by name in any scientific 

 scheme of classification. As far as known to me these generic 

 groups may be briefly diagnosed as follows : — 



Last two antennal joints united 2 



Last two antennal joints not united, the joints all free 7 



2 — Tarsi grooved beneath .3 



Tarsi not grooved beneath; antennte free, not received in sternal 

 fossae 4 



3 — Antennas completely sheltered within deep prosternal fossa. 

 California region. [Type Nosodenna diabolica Lee.]. 



Phloeodes 



Antennae not received within fossa;, the grooves only traceable in an 

 indefinite anterior depression. California region. [Type Noso- 

 denna plicata Lee] .^ Noserus 



4 — Antennal joints four to eight transverse and superfoliate, the ninth 

 as large as the two preceding united, the tenth cylindric, the 

 eleventh enclosed within its apex, very small and scarcely prom- 

 inent ; prothorax with the apex bilobed. Mexico. [Type N'oso- 

 derma dentictdata Sol.] * Sesaspis 



Antennal joints four to eight similar to the preceding, moniliform or 

 obconic, the ninth obconic, the eleventh more apparent, generally 

 forming with the tenth a subglobular mass ; scutellum subobso- 

 lete except in Noserimis 5 



