OAEISMA. 469 



OARISMA. 



Oarisma, Scudder, Rep. Peab. Ac. Sci. iv. p. 75 (1872) ; Butt. E. U. S. & Can. iii. p. 1858 (1889). 



This American genus, which was not identified by Watson, is easily recognizable by 

 the peculiarly formed antennae and the somewhat triangular primaries. 



The antennae are very short, much less than half the length of the costa, with a 

 long, straight, gradually thickening club, which is quite blunt at the tip. The palpi 

 have the second joint clothed with long hairs, and the third is long, slender, and 

 erect. The primaries are short and broad, somewhat truncate at the outer margin ; 

 the cell is a little less than two-thirds the length of the costa ; the discocellulars are 

 oblique, the lower one being much shorter than the upper ; the first branch arises 

 about the middle of the median nervure, the second at some little distance before 

 the lower angle of the cell ; the third median segment is more than twice the length 

 of the lower discocellular. The secondaries have the discocellulars barely traceable. 

 The body is rather slender and the head large, the abdomen extending beyond the 

 anal angle of the hind wings. The hind tibiae have two pairs of spurs. The primaries 

 are without a brand in the male. 



Oarisma differs from Adopceoides (type, Ancyloxypha simplex, Feld.) in the longer 

 and straighter antennal club, which is quite blunt at the tip, and from Adopwa in 

 the absence of the brand in the male and the longer third median segment of the 

 primaries ; and from both in the blunt and comparatively short wings. The genitalia 

 of the males of the two species are very similarly formed and quite different in 

 structure from those of either Adopcea or Adopceoides. 



The two species belonging to it inhabit Mexico and the Southern United States. 



1. Oarisma powesheik. (Paradopcea garita*, Tab. XCIL figg. 23, 24, 25, <s .) 

 Hesperia powesheik, Park. Am. Ent. ii. p. 271 (1870) 1 . 



Oarisma powesheik, Scudd. Rep. Peab. Ac. Sci. iv. p. 75 2 ; Butt. E. U. S. & Can. iii. p. 1859 3 . 

 Thymelicus powesheik, French, Butt. E. U. S. p. 301 *. 



Alis obscure et nitide fulvis, ciliis et costa posticarum fuscis : subtus anticis fulvis, striga lata a basi in 

 margine interno ad angulum analem extendente, fusca ; posticis navo-griseis, margine interno late fulvo ; 

 ciliis nisi ad angulum analem interne albis. 



2 mari similis, sed alis obscurioribus. 



Bab. Nokth America, Dakota 1 , Illinois 3 , Iowa 1 2 3 , Nebraska 1 3 , Montana 3 , Colorado 3 , 

 Arizona. — Mexico, Northern Sonora (Morrison), Puebla 7000 feet (H. J. Elwes). 



Only two males of 0. powesheik have yet reached us from within our limits, though 

 in the Southern United States it appears to be by no means uncommon. The Sonora 

 example agrees well with others from Colorado and Montana in our collection ; that 

 from Puebla is rather less fuscous along the inner margin of the primaries beneath. 



* Scudder's description of the genus Oarisma was not seen by us till after Tab. XCII. was printed, and 

 the specimens sent us by Strecker as Hesperia gariia were wrongly named ; hence confusion has arisen in the 

 identification of this insect. 



biol. cente.-amer., Khopal., Vol. II., June 1900. 3 p 



