56 University of Michigan 



ings in this series vary from the rather light, narrow, and 

 distinctly separated jjarallel marks characteristic of most east- 

 ern specimens of quadripunctatus to marks of a much broader, 

 heavily infuscated, and frequently confluent type. The infus- 

 cation is usually confined to the markings themselves, the mar- 

 gins of which are sharply delimited ; it does not tend to shade 

 out over the remaining portions of the basal antennal seg- 

 ments, as is so frequently the case in nigricornis. In series 

 at hand from Fort Sill, Oklahoma,^^ and Lawrence, Kansas,^* 

 all of the specimens are of this same type with the heavy anten- 

 nal markings. In a series from Colorado Springs, Colorado,^^ 

 one specimen is of the heavily marked type, the rest similar 

 to eastern specimens, as are the other Colorado specimens 

 examined. None of the eastern material of this species which 

 I have examined shows this heavily infuscated type of anten- 

 nal markings. It may be material of this type that Blatchley 

 regards as intermediate between nigricornis and quadripunc- 

 tatus. 



3- Fort vSill, Comanche Co., Oklahoma, Sept. 27-Nov. 10, 1918 (T. 

 H. Hubbell), 5 males, 3 females. 



3* Lawrence, Douglas Co., Kansas, Sept. 18-24, 1921 (Carl Brown), 



3 males, 9 females. 



^'5 Colorado Springs, El Paso Co., Colorado (H. B. Baker), 15 males, 



4 females. 



