HIPPODAMIA. 



25 



of the direction of its greatest length. Occasionally it opens caudad of the 



lateral process and at other times at both places. Still more rarely it 



breaks through at a third point more directly cephalad. Table 5 shows 



the geographical distribution of these characteristics and its association 



with the elytral pattern. 



As Kellogg and Bell (1904) 



have shown, the variation 



is continuous from large 



pronotal dashes through 



small ones to none at all. 



The presence or absence 



of pronotal dashes serves 



to distinguish specimens 



in collections from some 



localities, but not in the San Francisco Bay region. 



FIG. 14. Variation of pronotal pattern, a. 6, d, e, from Dilley, 

 Oregon: c, Fairfleld, Washington: floj, Berkeley, California. 



TABLE 4. Elytral pattern in Hippodamia convergens. 



TABLE 5. Elytral pattern in Hippodamia convergens. 



