424 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 45. 



IT. Side pieces of mesosternum diagonally divided and equal or very nearly so, epi- 

 stemum distant from the elytral margin, separated by the epimeron. 



Group Aphrasti. 

 3. Elj'tra oval, humeri rounded, body apterous Aphrastus Schonherr. 



Genus PARAPTOCHUS Seidlitz (1868). 



Paraptochus Seidlitz, Berl. Ent. Zeit., Beiheft., 186S, p. 35 note. 

 The genus is founded on californicus Seidlitz. 



Genus STENOPTOCHUS Casey (1888). 



Stenoptochm Casey, Ann. New York Acad. Sci., vol. 4, 1888, p. 259, 

 The genus is monotyjDic, based on inconstans Casey. 



Genus ORTHOPTOCHUS Casey (1888). 



Orthoptochus Casey, Ann. New York Acad. Sci., vol. 4. 1888, p. 261. 



The genus is monotypic, based on squamiger Casey. 



Genus OMIAS Gernnar (1817). 



Omias Germar, Mag. der Ent., vol. 2, 1817, pp. 339-341. 



Mylacus Schonherk, Gen. et Sp. Cure,, vol. 7, 1843, pt. 1, p. 144.. 



The type of Omias is rotundatus Fabricius, designated l)y Schon- 

 herr (1826), and of Mylacus is munnus Boheman, as originally 

 designated. Omias Gemminger and Harold (1871) is therefore 

 preoccupied and may be known as RMnomias Reitter (1894). 



Genus THRICOLEPIS Horn (1876.) 



Thricolepis Horn, Proc. Amer. Philos. Soc, vol 15, 1876, p. 68. 



Of the two original species we designate the first, inomata Horn, 

 as type. 



Genus PERITELOPSIS Horn (1876). 



Peritelopsis Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 70. 



The genus is monotypic, based on glohiventris LeConte. 



Genus PERITELODES Casey (1888.) 

 Peritehdes Casey, Ann. New York Acad. Sci., vol. 4, 1888, p. 262. 

 The genus is monotypic, based on ohtectus Casey. 



Genus PERITELINUS Casey (1888). 

 PeriteUnus Casey, Ann. New York Acad. Sci., vol. 4, 1888, p. 263. 

 The genus is monotypic, based on variegatus Casey. 



Genus GEODERCES Horn (1876). 

 Geoderces Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 70. 

 The designated type is melanothrix Kirby. 



