1866 BUTTERFLIES BEYOND NEW ENGLAND. 



large, but in reality the middle joint is bullate, only half as long again as broad, the 

 apical joint slender, small, not so long as the width of the middle joint. 



Fore wings elongate triangular, the lower outer angle falling a little outside the 

 middle of the costal margin, the apex pointed; costal margin full next base, beyond 

 distinctly though faintly and broadly excised ; outer margin slightly sinuous, with a 

 tendency to an angulate bend next the upper median nervule, and a faint excision in 

 the lower median interspace. Second subcostal nervule originating before the middle 

 of the wing ; seconil median nervule arising opposite a point between the origin of the 

 third and fourth subcostal nervule; cell nearly two-thirds as long as the wing. Hind 

 wings triangular, the costal and inner margins of about equal length, the outer margin 

 gently rounded, but mesially excised a little, so as to appear faintly bilobed. First 

 median fork slightly more distant from the base than the subcostal. 



Fore femora and hind femora of equal length, the former half as long again as its 

 tibia, the latter four-fifths as long as its tibia; fore tibia hardly two-fifths as long as 

 the fore tarsi, which are only a little shorter than the hind tarsi; first joint of hind 

 tarsi as long as the remainder together, the last joint as long as the preceding. Claws 

 minute, strongly bent in the middle, the paronychia simple, triangular, tapering lobes, 

 as long as the claw and nearly concealing it on the side, but originating just below it. 



This group of slender, sliarp-winged and presumably very swift Pam- 

 philidi is tolerably numerous in species, which occur from the southern part 

 of the United States, through the Antilles, Mexico and Central America 

 to Venezuela. Two species occur in the United States, both of which occa- 

 sionally reach the northern half. Nothing is known of their history or 

 time of flight, excepting that on their northern edge they fly at the end 

 of June. 



PRENES OCOLA. 



£esj[)er8aocoiaE(lw.,Proc,ent.soc.Philad., 332 (1S86). 



ii : 20, pi. 11, fig. 4 (1863). Irenes ocola Scudtl., Syst. rev. Amer. butt., 



Pamphila ocola Kirb., Syn. eat. diurn. 60 (1872). 

 Lep., 607 (1871) ; — French, Butt. east. U. S., 



Imago. Head covered above with mingled fulvous and blackish brown scales and 

 hairs, the palpi similar, pallid beneath at the base, the apical joint and the outer 

 anterior edge black; antennae black, clay brown beneath, especially on the body of the 

 club. Thorax covered with dull tawny hairs above, beneath with dull brown and pallid 

 hairs; the legs dark brown above, dull saffron beneath. 



Wings above uniform dark brown with a very faint, dark tawny reflection. The 

 fore wings with very simple markings, consisting of a minute, triangular, vitreous spot 

 at the extreme base of the upper median interspace, a much larger, strongly lunulate, 

 sub-triangular, vitreous spot at the extreme base of the lower median interspace, its 

 outer margin as far removed from the previous spot as its own length, and a faint, 

 brief, longitndinal streak of the same, lying upon the middle of the submedian nervure ; 

 in addition there is in the female a pair of very faint and minute dashes or dots close 

 to the base of the last two superior subcostal interspaces, one directly above the other. 



Beneath, warm dark brown; the base of the fore wings obscured with black, es- 

 pecially along the nerrnres ; the markings of the upper surface of the female are 

 repeated beneath in both sexes but the spot on the submedian nervure becomes sordid 

 white, and all the spots have a tendency to be of larger size, and in addition there is 



