NO. 1988. STUDIES OF NORTH AMERICAN WEEVILS— PIERCE. 409 



Genus SCYTHROPUS Schonherr (1826). 



Seyfhropus Schonherr, Cure. Disp. Meth., 1826, p. 140. 

 The originally designated type is mustela Herbst. 



BLOSYRINI, new tribe. 



Table of genera of Blosyrini. 



1. Scape attaining the middle of the eyes, the latter moderately prominent, without 



posterior orbit Hormorus Horn. 



2. Scape barely attaining the anterior margin of the eye, the latter spherical, promi- 



nent, and with posterior orbit Agasphserops Horn. 



Genus HORMORUS Horn (1876). 



Hoi-morus Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 23. 

 The genus is monotypic, based on UTidulatus Uhler. 



Genus AGASPHSEROPS Horn (1876). 

 Agasphserops Horn, Proc. Amer. Philos. Soc , vol. 15, 1876, p. 24. 



The genus is monotypic, based on nigra Horn. 



It is possible that future study may separate these genera from the 

 Blosyrini typical, as suggested by Horn, but for the present it is best 

 to adhere somewhat closely to the Lacordaire classification. 



SCIAPHILINI, new tribe. 

 Table of genera of SdapTiilini. 



1. Body slender, cylindrical; antennae attenuate ; scrobes very broad at angle, thence 



naiTowing to termination Mitostylus Horn. 



2. Elytra robust, oval; antennae stouter; scrobes not so broad at angle. 



Sciaphilus Schonherr. 



Beyond the general facies there are few tangible generic differences 

 between these two genera. 



Genus MITOSTYLUS Horn (1876). 



Mitostylus Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 107. 

 Derosomus Sharp, Biol. Centr.-Amer., Coleop., vol. 4, 1891, pt. 3, p. 168. 



Sharp's genus is perfectl}?" congeneric with Horn's. We designate 

 as type of Derosomus the first species , /ra^-iZis Sharp, as it is the onh" 

 one illustrated. The monotype of Horn's genus is tenuis Horn. The 

 genus as now known includes six species for w^hich a table is pre- 

 sented. The two species not before the writer are scutellaris Sharp 

 (1911) and glaucus Champion (1911). There is scarcely any doubt 

 but that Chsetopantus Sharp is also a synonym of Mitostylus, but no 

 specimens are before the writer. 



