380 PROCEEDINGS OF THE NATIONAL MUSEUM. vou 45. 



Table of species of Miloderes. 



1. Elytra with evident, though fine, serial punctures (California) setosus Casey. 



2. Elytra without trace of serial punctuation (Arizona) viridis Pierce. 



Examination of setosus and viridis shows that the nasal plate in 

 both species is obsolete. 



Genus DICHOXENUS Horn (1876). 



Dichoxenus, Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 39. 

 The genus is monotypic, based on setiger Horn. 



DICHOXENUS SETIGER Horn. 



This species has a sharply defined concave, glabrous nasal plate 

 with lateral rims and strong basal emargination. 



Genus ORIMODEMA Horn (1876). 

 Orimodema Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 43. 



The genus is monotypic, based on protrada Horn. 



ORIMODEMA PROTRACTA Horn. 



The nasal plate in this species is glabrous, depressed and crescent 

 shape or at least emarginate at base. ' 



Genus AMOTUS Casey (1888). 



Mimetes Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 44 [not Lacordaire]. 

 Amotus Casey, Ann. New York Acad. Sci., vol. 4, 1888, p. 243. 



The type of the genus Mimetes (Schonherr) Lacordaire is evidently 

 setulosus (Schonherr) Lacordaire by original designation, and we 

 hereby designate the type of Amotus as longisternus Casey. There 

 has been considerable misunderstanding of these genera. Lacordaire 

 and Schonherr associated Mimetes with the Brachyderides , which are 

 without postocular lobes. The material previously ^ placed by the 

 writer under Mimetes seniculus Horn is apparently Mimetes setulosus 

 Lacordahe and belongs as Lacordaire placed it, in the Psallidiinae, 

 Epicaerini. The species Mimetes setulosus Horn [not Lacordaire] is 

 therefore Amotus gracilior Casey. Mimetes s&niculus Horn must be 

 placed, untU recognized, under Amotus. 



Table of species of Amotus. 



1. Elytral interspaces flat; median groove of beak feeble in front but with an angulate 



impression at base between the eyes ■.seniculus Horn. 



2. Alternate elytral interspaces more convex. 



aK Ocular vibriesae extremely short and inconspicuous; median impressed groove 



of beak very feeble and only present near base longisternus Casey. 



a^. Ocular vibrissas longer and more conspicuous; beak strongly impressed along 

 the middle. 



6'. Prothorax longer than wide; species 8 mm. long longipennis Pierce. 



b-. Prothorax wider than long; species 5.5 mm. long gracilior Casey. 



1 Proc. U. S. Nat. Mus., vol. 37, p. 348. 



