176 Proceedings of the Biological Society of Washington. 



BB. Markings of dorsal surface less contrasted. obtusa. 



Clastoptera obtusa var. achatina Germar. — Forest Glen, Md., September 

 15, 1915, Otto Heidemann; Plummers Id., Md., August 27, 1905, Septem- 

 ber 13, 1914; Stubblefield Fall, Va., July 4, 1918, on hickory; Mt. Vernon, 

 Va., June 27, 1915, W. L. McAtee. 



Clastoptera obtusa var. obtusa Say. — Common, dates of collection ranging 

 from June 13 to November 3; has been taken on Alnus rugosa and Car- 

 pinus carotiniana. P. I. 



Clastoptera obtusa var. tristis Van Duzee. — Common, with the last, 

 with which it extensively intergrades; extreme dates of collection, June 7 

 and November 21; has been taken on the same plants as var. obtusa, also 

 on hickory. P. I. 



C. xanthocephala Germar. 



Key to the Varieties. 



A. Color above chiefly black. xanthocephala. 



AA. Color above chiefly yellowish brown. glauca. 



Clastoptera xanthocephala var. xanthocephala Germar. — Common, season 

 June 29 to October 5 P. I. 



Clastoptera xanthocephala var. glauca Heidemann. — Common, has been 

 collected from January 2 to November 3; winters among the foliage of 

 Pinus virginiana. P. I. 



C. pint Fitch.— Beltsville, Md., June 14, 1914, W. L. McAtee; June 28, 

 1917, on flowers of Xolisma ligustrina, L. O. Jackson; Glencarlyn to 

 Barcroft, Va., July 18, 1915, W. L. McAtee. 



