HIPPODAMIA. 



49 



the mountain environment will later be discussed in this connection. 

 The vittate tendency is much more marked here, as might be expected, 

 than in H. convergent var. quinquesignata, nearly all specimens showing 

 some evidence of it. The absence of pronotal spots is another result to be 

 expected from the mountain environment. 



The basal band is the chief differential from H. spuria. Specimens of 

 that species differing only by absence of pronotal dashes are often labeled 

 H.oregonensis. Such specimens should be considered a variety of H. spuria, 

 as presence or absence of pronotal spots alone is a character of less distinc- 

 tion in Hippodamia than presence or absence of the basal band. 



Form a. Spots J+l, 6+4+5, Pinnacle Peak, Washington. 



FIG. :ti. Variation in color-pattern in H. oregonensis. c = mode; 6, from Oregon; c to e, from 



Pinnacle Peak, Washington. 

 FIG. :>>. Variation in color-pattern of H. cockerelli. a, from Colorado; 6, from Yellowstone Park. 



3048 a. Hippolamia cockerelli, new species. 



Distribution: Colorado to Wyoming. 



This species resembles H. spuria, except in color-pattern (see fig. 33). 

 This is remarkable in possessing vittae and banding in combination. It is 

 the Rocky Mountain equivalent of H. oregonensis of the Cascade Moun- 

 tains. The two mountain systems have given two different mountain 

 species derived from H. spuria. If intergrades are ever found it will prob- 

 ably be at the convergence of the two mountain systems in British Columbia. 

 The type is in the U. S. National Museum. It was collected by Prof. T. 

 D. A. Cockerell, in honor of whom the species is named, in Cottonwood 

 Gulch, on the west slope of the Sangre de Christo Range, in the Hudsonian 

 Zone, in Saguache County, Colorado, August 4, 1887. 



There are also two specimens from Yellowstone Park in the collection 

 of Mr. F. P. Bowditch. The three show very little variation. I have never 

 seen any tendency to the formation of a basal band in H. spuria, although 

 I have seen many specimens in the Western States. This species has 

 apparently arisen discontinuously. The complete lack of intergrades I 

 have taken to indicate that it is intersterile with H. spuria, since complete 

 dominance, even if there be complete segregation, is not to be expected in 

 coccinellid color-patterns. 



