NATURAL SCIENCES OF PHILADELPHIA. 55 



are diminutive in size. There is also a specimen in the cabinet of the late Dr. 

 Harris, at Cambridge, Mass., taken by Prof. Agassiz on the north side of Lake 

 Superior. 



In the markings of its surface Atlantis bears a close resemblance to Cybele 

 and Aphrodite, to Adippe and Aglaia of Europe, and to Zerene and Astarte of 

 California. It especially resembles the three last-named species iu the zigzag 

 band which crosses the disk of secondaries, but which in Aphrodite takes the 

 form of a belt of small crescents, separated by wide spaces. It is, moreover, 

 readily distinguished from Aphrodite by its duller color, broad black margin 

 to both wings and color of secondaries below. It also differs sensibly in the 

 shape of the primaries, the margins meeting at the inner angle more obtusely, 

 the outer angle being more acute and the breadth of the wing from the inner 

 angle to middle of costa much less. The antenna? are shorter by one eighth of 

 an inch. 



Of the three species, Cybele is Southern, and in the vicinity of Newburgh, 

 N. Y., is found but little more abundantly than Aphrodite. In the Catskills 

 the latter abounds and Cybele is rare, much less common than Atlantis. 

 From Connecticut, Massachusetts and Canada, I have seen no Cybele, though 

 doubtless it is occasionally found in those districts. The prevailing Northern 

 species is Aphrodite. 



Thecla acadica, nov. sp. 



Male. Expands 1*2 inch. 



Size and form of Falacer. Color above dark brown, costal edge of prima- 

 ries rufous ; in the disk a smooth oval spot ; secondaries have a single tail, 

 from the base of which a bluish white line extends along the margin to the 

 anal angle ; the space next above this line is sprinkled slightly with fulvous 

 scales making an indistinct broad band, which ends beyond the tail in a clear 

 fulvous spot ; fringe of both wings brown, next before the tail white, beyond 

 it black, through which runs a white line, and at the angle black. 



Under side dark grey, with a pearly lustre ; on primaries a short discal bar, 

 edged with white ; beyond this, a bent transverse row of black spots, each 

 edged with white, the one next the costa minute, the next three round, fourth 

 and fifth oval, and sixth double ; within and along the margin a row of elon- 

 gated, pale fulvous spots obsolete towards the apex, narrowly bordered within 

 by black, on which rests a line of bluish white. 



Secondaries have a long discal streak, a transverse row of black spots and 

 streaks, each edged with white, the six from the costa nearly round, the next 

 long and bent toward the anal angle, the last a streak running up the abdomi- 

 nal margin and bent upward at right angles near its inner extremity ; hind 

 margin edged with white and bordered by a bright red band, divided by the 

 nervures into spots, arched above and edged with black, on which is a line of 

 bluish white ; this band extends some distance up the abdominal margin, and 

 encloses on the hind margin, near anal angle, a large rounded space sprinkled 

 with blue atoms ; the three red spots next outer angle partly obsolete. 



Taken near London, C. W., by Mr. W. Saunders. 



Thecla IuEta, nov. sp. 



Expands 9-10 inch. 



Upper side of primaries black, of secondaries blackish brown ; near base of 

 primaries a few scales of metallic blue ; costal edge red ; next the anal angle 

 of secondaries a broad band of metallic blue scales, many of which are re- 

 placed by black, extends half way along the hind margin ; beyond the band 

 a fine line of these scales follows the margin to the outer angle ; anal angle 

 edged with red ; fringe grey. 



Under side of secondaries and apex and costal margin of primaries slate 

 blue, with a green tinge ; costal edge of primaries red ; disk smoke color ; 

 beyond the cell, on costal margin, a transverse, abbreviated series of fine red 



186 k 2.] 



