4 JOHN B. SMITH. 



Id the common eastern species there is no one prominent feature, 

 and the secondaries are reddish or smoky. This, from its general 

 locality, I have called atlantica; but as a matter of fact it extends 

 to the Rocky Mountains in Colorado. This is the species which 

 most resembles the European nictitans, but the sexual pieces of the 

 male differ completely. 



Pacifica is so called from the fact that all of the examples seen 

 by me comes from the Western Coast States, ranging from California 

 to Vancouver. It seems to be less common than its eastern ally and 

 is a little more brightly shaded. None of the examples seen by me 

 have the ordinary spots white; but all of them have the angulated 

 median shade well marked or even prominent. The secondaries are 

 yellowish or purplish red and somewhat silky, quite different from 

 the eastern examples. Finally, the primaries are somewhat shorter 

 and broader, giving the species a stouter, chunkier appearance. 



Interoceanica occurs, so far, only in the region about Winnipeg, 

 Manitoba, but will probably be found north and west of that point. 

 It may also extend southward into the United States; but I have no 

 material from the border States. In wing form this is more like 

 nictitans, but in color it is much darker, the secondaries being 

 almost blackish. In the specimens before me the reniform is white ; 

 but this may not be a uniform character. 



These three species I would hardly have dared to separate from 

 nictitans had it not been for the differences in structure in the male 

 genitalia ; but these are so radical that specific identity is out of the 

 question. 



In the European nictitans the harpes are bent at the middle, 

 forming a long trigonate tip, which is partly fringed and partly set 

 with spines. There are two clasper-like corneous processes, but so 

 irregular that verbal description is difficult. Reference should be 

 had to pi. 1, fig. 7. 



Atlantica has the harpes almost even throughout and only a little 

 curved at the middle; the tip is rounded and fringed with spines, 

 except at the inferior angles, while some distance within the tip is a 

 triangular patch of densely set spines, which is found in no other 

 species. The clasper is a very long, curved and somewhat twisted 

 hook, which arises from a chitinous ridge within the middle. 



Pacifica has the harpes decidedly shorter and more abruptly bent, 

 forming a triangular tip that is elevated above the usual portion. 

 The upper half of the tip is fringed with spinules. The clasper 



