132 Proceedings of the Biological Society of Washington. 



PUBLILIA Stal. 

 P. reticulata Van Duzee.— Forest Glen, Md., May 30, 1914, Plummers 

 Id., Md., April 28, 1915, McAtee; July 7, 1906, O. Heidemann; Dead Run, 

 Va., May 27, 1917, Great Falls, Va., Aug. 15, 1915, McAtee; Washington, 

 D. C, May 25, 1879; Sept. 10, 1887. 



HOPLOPHORINAE. 

 A single genus Platycotis p. 132. 



PLATYCOTIS Stal. 



A. Color olive varied with yellow to orange spots .sagiltala. 



AA. Color stramineous with orange to red longitudinal streaks 



quadrivittata. 



P. quadrivittata Say. — Plummers Id., Md., nymphs and adults on 

 Quercus rubra, June 7, 1914, nymphs Oct. 5, 1915; Widewater, Chesapeake 

 and Ohio Canal, Md., nymphs Sept. 28, 1913; Branchville to Beltsville, 

 Md., nymphs, June 4, 1914; Glencarlyn to mouth of Four-mile Run, Va., 

 nymphs, Sept. 27, 1914, McAtee. 



P. sagittata Germar. — Beltsville, Md., June 14, 1914, McAtee; July 12, 

 1919, L. L. Buchanan; Widewater, Chesapeake and Ohio Canal, Md., Sept. 

 28, 1913; Eastern Branch near Benning, D. C, Aug. 17, 1913, McAtee; 

 Four-mile Run, Va., June 29, 1913, A. Wetmore. 



MEMBRACINAE. 



Key to the Genera. 



A. Lateral ridges of pronotal process about equally distant from upper 



and lower margins both of which are carinate. Enchenopa p. 132. 



AA. Lateral ridges of pronotal process near upper margin, which is carin- 

 ate, while the lower is not Campylenchia p. 132. 



CAMPYLENCHIA Stal. 



C. latipes Say.— Common and widespread; season June 15 to October 13. 

 P. I. 



ENCHENOPA Amyot and Serville. 



E. binotata Say. — Common, everywhere; dates of collection extend from 

 May 18 to Sept. 14. 



CENTROTINAE. 

 A single genus Microcenirus p. 132. 



MICROCENTRUS Stal. 



Key to the Species. 



A. Pronotum without horns, its posterior process little if at all sur- 

 passing scutellum caryae. 



AA. Pronotum with compressed suprahumeral horns, its posterior process 



sometimes surpassing scutellum perdita. 



