AET. 13 MIEroAE OF DIST. OF COLUMBIA KNIGHT AND McATEE 9 



DERAEOCORIS POECILUS McAtee 



Fairly common; active season March 8 to August 21; occurs on 

 Ahhus Tugoscb; collected under bark of birch, maple, and sycamore 

 in winter. P. I. 



DERAEOCORIS HISTRIO Renter 



District of Columbia, February 21, 1887, November 24, 1886, Per- 

 gande; April 17 (Uhler collection). 



DERAEOCORIS NUBILUS Knight 



Virginia, October 5, Pergande. 



DERAEOCORIS FASCIOLUS var. CASTUS Knight 



Rock Creek Park, D. C, June 26, 1921; Glen Echo, Md., June 11, 

 25, July 16, 1922, J. R. Malloch. 



DERAEOCORIS GRANDIS Uhler 



Several specimens have been taken on Plummer Island, Md., at 

 dates ranging from June 4 to July 8, once at light ; there is a record 

 also for Beltsville, Md., June 14, 1914, McAtee. 



DERAEOCORIS APHIDIPHAGUS Knight 



Glen Echo, Md., July 15, 1893 (Uhler collection) ; Plummer Island, 

 Md., June 15, 1902, Heideman; June 4, 1905; Washington, D. C, 

 July 6, 1907, McAtee; Great Falls, Va., July 18, 1926, Knight; 

 Mount Vernon, Va., June 6, 27, 1915, McAtee; Pergande records it 

 as feeding on Schizoneura aniericana,. 



DERAEOCORIS QUERCICOLA Knight 



Washington, D. C, July 2, 1907, Heidemann; June 15, 1925, on 

 Qicercus Tiiacr'ocar'pa ; Beltsville, Md., June 23, 1918, on Quercus alba, 

 McAtee. 



DERAEOCORIS NITENATUS Knight 



Fairly common ; dates of collection range from May 25 to Septem- 

 ber 2. P. I. 



DERAEOCORIS NIGRITULUS Knight 



Common on Pvrms virginiana; season May 9 to July 12. V. P. I. 



DERAEOCORIS SAYI Renter 



Plummers Island, Md., July 8, 1907, Schwarz. 



Subfamily Orthotylinae 

 Genus SEMIUM Reuter 



SEMIUM HIRTUM Reuter 



This little species is seen more often than collected, its agility ren- 

 dering it difficult to capture, and its delicacy of structure results in 

 33072—29 2 



