AMERICAN LEPIDOPTERA. 231 



them in series, sexes separated but associated, I examined the male 

 genitalia of each series, permanently mounting twenty examples on 

 slides in Canada balsam. Each of these specimens was drawn 

 under the microscope, using a camera lucida, and as the lens was 

 the same throughout, and the drawing board always at the same 

 point, the figures were strictly comparable. Before going into de- 

 tails of structure or specific description, it may be well to note the 

 general differences apparent in the series, and the distribution of 

 each series. 



The first series, which I consider typical olivacea, is represented 

 by 20 males and 6 females. Localities are Orono and other points 

 in Maine; Webster and White Mountains, N. H. ; Lenox, Mass.; 

 Sharon Springs, Schenectady, Albany and Long Island, N. Y. ; 

 New Brunswick, N. J. ; Miakka, Florida; Glenwood Springs, Colo- 

 rado — one male only. There is a possible error as to this last ex- 

 ample since it reached me without label, associated with others un- 

 doubtedly fron) that place, though not from Dr. Bai'nes. These 

 examples average 25 mm., or 1 inch , the more northern specimens 

 exceeding, the Florida examples not quite attaining that expanse. 

 In the males the maculation is always distinct, the median space 

 darkest ; s. t. space gray and variably contrasting : the basal space 

 is also paler, but does not contrast so strongly. The females are 

 darker, more evenly colored and without marked contrasts. In the 

 s. t. space, particularly toward the inner margin, there is a powder- 

 ing of yellowish or greenish scales, which, in the male, usually ex- 

 tends through a great portion of the wing, giving a certain mossy 

 or olivaceous appearance which is characteristic ; but more easily 

 seen than described. In the female this is less apparent. There is 

 no distinct reddish shade in any male, but in the females there is a 

 decided tendency in that direction. The space opposite the anal 

 angle is obviously brown ; but it is a yellow and not a red-brown. 

 The best marked and most obviously mossy specimens are those 

 from the northern localities ; as the examples decrease in size in 

 Florida, so also there is less of the powdery appearance. 



Four pern^nent mounts made from this series show practically 

 no difference in genitalic structure. 



The next series of specimens consists of 16 males and 6 females 

 from Winnipeg, Cartwright and Brandon, Manitoba; and Yellow- 

 stone Park, Wyoming. They range from 22 to 25 mna. in expanse, 



TEANS. AM. ENT. SOC, XXVII. JUNK, 1901. 



