124 BULLETIN 114, UNITED STATES NATIONAL MUSEUM. 



from St. Louis to Indiana may have a lower average formula than 

 those from farther west and southwest. 



Sex influence on the number of scale rows seems evident. The 

 large majority of individuals that attain the maximum number of 

 rows, 27, are females; of those possessing the lowest formula, three- 

 fourths are males ; of the individuals having the formula next to the 

 highest, the majority are females; and of those possessing the inter- 

 mediate formulae, 23-25-23-21-19 and 25-23-21-19, about half are 

 males and half females. 



This form is not at present known to intergrade with rTiomboTnacu- 

 lata, but this may be due to our lack of knowledge of the situation in 

 eastern Mississippi and western Alabama and Tennessee. The close 

 relationship between calligaster and rhombomaculata is more fully 

 brought out under the discussion of the latter form. 



