HENRY SKINNER 199 



natural group of the species. Study of the genitaha shows that 

 such is not the case, but that change in environment has brought 

 about this different color in the fringe of the wings. This may be 

 illustrated by an examination of the figures given. Terentius, 

 a black-fringed species, is very nearly related to funeralis, a white- 

 fringed species. At present I see no essential difference in harpes 

 of the two although differences in the other parts may eventually 

 be found. Juvenalis and clitus are very close to each other. 

 Lilius and pacuvius are equally close, and in fact can only be 

 separated by the color of the fringe. Additional material will be 

 necessary to determine their exact relalionship. The discovery that 

 burgessi and scudderi are so different in the anatomy of the genitalia 

 from brizo and pacuvius respectively has been a great surprise, and 

 would not have been suspected had it not been for these studies. I 

 have had specimens of both species for more than thirty years. 



The text figures of the genitalia are merely outline drawings, 

 made with the aid of the camera-lucida, of the harpes as they 

 appear on the micro-slide. No attempt is made to show perspective 

 or other details, including pilosity and bristles. The right and left 

 given is in relation to the position or sides of the insect. There is 

 generally a slit shown about the middle near the large appendage. 

 This is a break in the chitin due to flattening on thQ micro-side. 

 Magnification twenty diameters. The magnification is the same 

 as in the figures given by Scudder and Burgess. The drawings 

 were made by Mr. E. T. Cresson, Jr. 



Thanaos icelus Scudder and Burgess, Proc. Boston Soc. Nat. Hist., 



xiii, 288, 1870, figs. 3L, 3R, 3U (genitalia). 

 Lintner, Twenty-third Annual Report of the New York State Cabinet of 



Nat. Hist., Entomological Contributions, p. 162 (p. 30), 1872, pi. 7, figs. 



5, 6, male. 

 Scudder, Butterflies Eastern U. S. and Canada, ii, 1507, 1889, pis. 9, 28, 77, 



85. 

 Holland, Butterfly Book, pi. 48, fig. 17, male. 



A/flic— Expanse, 12 to 15 mm. Uppcrside. Primaries: outer half of 

 fringe light brown, inner half gray; marginal line narrow and black; parallel 

 to this a row of seven brown spots, extending from the costa nearly to the 

 inner margin ; crossing the wing beyond the disk is an irregular row of spots, 

 the upper half composed of narrow lines and the lower of four rings; in the 

 end of the cell is a small ring and another just below it, but not in the disk. 

 The outer half of the wing is covered with grayish white scales, most promi- 



TRANS. AM. ENT. .SOC, XL. 



