HIPPODAMIA. 



45 



3036 a. Hlppodamia bowditchi, new species. 



Distribution: Northern Rocky Mountains. 



The type (fig. 28, d) and 5 cotypes (fig. 28, 6, c, e,f, g) of this species were 

 collected from goldenrod August 12, 1904, on the bank of the river at St. 

 Maries, Idaho. The pattern is comparable to that of H. convergent and vari- 

 ety quinquesignata and would be considered a variety of that species but 

 for the distinct hiatus between the 4 specimens of variety quinquesignata 

 and 11 of other varieties of H. convergens, taken in the same lot, on the one 

 hand, and the 6 in question on the other hand. The black bands of quin- 

 quesignataare here much enlarged; the intermediate band is thicker in the 

 baso-apical direction than the space between it and the basal band. The 

 wide basal band is nearly uniform in width and thus shows little evidence 

 of its component spots. It shows no rounded projection at the position of 

 spot 3. Spot 2 is absent and the apical spot is much enlarged. The inter- 

 mediate band is so enlarged as to obscure its compound nature and its apical 

 margin shows no angulation. Its basal margin has an angulation, but no 

 restriction is produced in the band. The band extends far toward both the 

 suture and the costal margin and shows a straightened edge in these 

 directions. 



FIG. 2s. Variation of color-pattern of Hippodamia bowditchi. d = mode: 6 to g, from St. M.trit--. 

 Idaho, A, from Bitterroot Mountain.s: a, a specimen of H. convergens var. quinquexiynata 

 collected with them. 



With the exception of a very slight convergent dash on one side of one 

 specimen (fig. 28, a) the pronotum is spotless. The black pattern reaches 

 the cephalic border of the pronotum on each side and in some cases extends 

 along it for some distance (fig. 28. d). The black pattern always shows a 

 lateral extension which generally reaches the border and in some cases 

 extends to the caudo-lateral corner (fig. 28, b) . The variation of the pro- 

 notum is paralleled by individuals of H. convergens. 



The ground-color is yellow without a trace of reddish color, in strong 

 contrast with that of the accompanying specimens of H. convergens. The 

 peculiar ground-color suggests the possibility that these beetles are only 

 larvae of H. convergens modified by some unusual food. Such an hypothesis 

 must be rejected for the present for the more likely one of a specific dif- 

 ference. Unfortunately, I have been unable to attempt hybridization be- 

 tween this new species and H. convergens. 



