NO. 1988. STUDIES OF NORTH AMERICAN WEEVILS— PIERCE. 425 



Genus GEODERCODES Casey (1888). 

 Geodercodes Casey, Ann. New York Acad. Sci., vol. 4, 1888, p. 265. 

 The genus is monotypic, based on latipennis Casey. 



Genus ARAGNOMUS Horn (1876). 

 Aragnomus Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 72. 

 The genus is monotypic, based on griseus Horn. 



Genus DYSTICHEUS Horn (1876). 

 Dysticheus Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 73. 

 The genus is monotypic, based on insignis Horn. 



Genus EUCYLLUS Horn (1876). 

 Eucyllus Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 74. 

 The genus is monotypic, based on vagans Horn. 



Genus THINOXENUS Horn 1876). 

 Thinoxenus Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 74. 

 The genus is monotypic, based on squdlens Horn. 



Genus RHYPODILLUS Cockerell (1906) 



Rhypodes Horn, Proc Amer. Philos. Soc, vol. 15, 1876, p. 75 (not Stal. 1874). 

 Khypodillus Cockerell, Ent. News, vol. 17, 1906, p. 243. 



Cockerell's name was proposed as a substitute for Horn's pre- 

 occupied name. We may consider the first of the two original 

 species, dilatatus Horn, as type. 



Genus APHRASTUS Say (1831). 

 Aphrastus Say, Descr. N. A. Cure, 1831, p. 9. 

 The genus is monoty])ic, based on tseniatus Say. 



EUSTYLINI, new tribe. 

 Table of genera of Eustylini. 



1. Scape short, stout, scrobes short, suddenly arcuate. Scutellum rather large, 



oval Brachystylus Schonherr. 



2. Scrobes widely open from above, cavernous in front, very shallow posteriorly, 



slightly arcuate and directed toward eyes. Scutellum moderate, oval. 



Achrastenus Horn. 



Genus BRACHYSTYLUS Schonherr (1845.) 



Brachystylus Schonherr, Gen. et Sp. Cure, vol. 8, 1845, pt. 2, p. 433. 

 The genus is monotypic, based on acutus Say. 



