234 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



range. Freshly preserved material showed only the yellow paranotal 

 spots, with no trace of any median spots. However, the probable 

 derivation of this phase from the normal trimaculate pattern can be 

 inferred from a large series (35 specimens) from a single locality in 

 Transylvania County, North Carolina, on the extreme northeastern 

 edge of the range. Here there is a strong tendency for the median 

 spots to diminish in size, especially anteriorly. The characteristics 

 of this series are summarized as follows : 



Condition Males Females 



Collura immaculate 1 



Collum with anterior spot only 4 



Collum with large anterior and very small posterior spot .... 3 7 



2nd segment without median spot 3 



2nd and 3d segments without median spot 2 



Collum and following segments with small but distinct spots . 7 7 



Immature specimens taken at the same time and place are rather 

 typical of last-stadium forms of the genus; that is, they have moder- 

 ately large and distinct median spots, a fact permitting the inference 

 that departure from the trimaculate condition is an evolutionary 

 specialization. 



Broad median spots, usually lunate or crescentic in form, occur at 

 various places in the range but are most characteristic of the popula- 

 tions in the Smokies, Balsams, and Unakas. Here the spots are up to 

 50 percent of the width of the segments, and in some females nearly 

 or actually touch the paranotal spots. The same general pattern 

 recurs in the Kentucky segment of the Cherokia population. 



The pattern characteristic of the population in much of the western 

 Carolinas and adjoining states is that of small yellow paranotal spots, 

 with yellow median sub triangular spots of equal size. This pattern 

 has been seen in the Blue Ridge of South Carolina and Georgia, in 

 the Nantahalas and Cowees of North Carolina, and in the ranges 

 west of the Unakas in southeast Tennessee. 



An interesting variation in the pattern occurs in a restricted area 

 of the Blue Ridge. In this phase the three yellow spots of each seg- 

 ment are connected by a transverse chestnut or reddish band, the 

 intensity of which increases adjacent to the yellow spots and produces 

 a most attractive effect. In addition, the legs of this form are pink 

 instead of the typical yellow. Such specimens have been found at 

 four localities: on Chatooga Ridge, north of Mountain Rest, South 

 Carolina; the gorge of the Chatooga River south of Cashiers, North 

 Carolina; around Highlands, North Carolina; and at Walnut Creek 

 Gap in the Cowee Range, 8 miles northwest of Highlands. At all of 

 these places, this variation occurs along with the typical form. None 

 has been found beyond this limited range, a condition shown by the 



