HIPPODAMIA. 



33 



in some California localities, but not in others. At Coolidge, New Mexico, 

 where spots are confluent, the pronotal dashes are absent in a large propor- 

 tion of cases and are present where there is no confluence. This is also 

 noticeable in some small lots from Colorado and Utah, but in the Pacific 

 States this difference is not marked. 



TABLE 10. Correlation of relation of spots % and 3 with relation of spots 4 

 and 5 in Hippodamia convergent at Fairfield, Washington. 



TABLE 11. Correlation of relation of spots I and 3 with relation of spots 4 and 5 in 

 Hippodamia convergens at Fairfield, Washington. 



* Var. qitinquesiynatri. 



! Var. caseyi. J Oanvergens. 



Var. obsoleta. 



The lateral extension of the black area on the pronotum to the margin, 

 so as to make "margin incomplete laterad," is associated, strangely 

 enough, with both spotless elytra and elytra with spots confluent. We 

 shall see later that this characteristic is subject to modification, so that 

 the great variation between the several localities in eastern Washington 

 which differ in altitude is readily understood. In fact, a lot of hibernating 

 beetles from Fairfield in 1907 showed far fewer specimens with the margin 

 incomplete laterad than those of another year. 



The cephalic extension of the black area of the pronotum causing an 

 incomplete margin cephalad is only common in California and New Mexico 

 with beetles lacking the pronotal dashes, but that it is not a necessary con- 

 sequence of the absence of the dash is shown by the specimens from Mil- 

 ford, Utah. 



We have, then, in different localities, a difference in the correlation and 

 the order of development of the pronotum and the elytra. 



