PROC. ENT. SOC. WASH., VOL. 22, XO. J , OCT., 1920 Hi.") 



6. Apex of abdomen black; all tibiae black, except posterior pair on inside; 



never much black pile on scutellum fervidus 



Apex of abdomen usually with some ferruginous pile; some of tibiae usu- 

 ally with more or less ferruginous hair; yellow pile of scutellum often 

 with strong admixture of black hair pennsylvanicus 



7. First three dorsal abdominal segments yellow perplexus 



Some black pile on third dorsal abdominal segment \ . .8 



8. Only the first segment with yellow pile impaliens 



Second segment with more or less yellow pile 9 



9. Always some black pile on second segment bimaculatus 



Second segment entirely yellow vagans 



For complete descriptions of the following species the reader 



is referred to the "Bombidae of the New World," by Henry J. 

 Franklin. 1 



Annotated List of Species. 

 1. Bremus affinis (Cresson). 



This is one of the rare species in this region. The following 

 are the only records I have after five years collecting : 



Queens, April 30, 1916 (Maryland, near Plummer Id., on flowers of Clechoma 

 hederacea, H. L. Viereck; Virginia, near Plummer Id., Md., 

 flowers of Mertensia virginica, L,. O. Jackson). 

 June 28, 1917 (Beltsville, Md., on flowers of Xolisma ligustrina, 



L. O. Jackson). 



September 5, 1915 (Maryland, near Plummer Id., L. O. Jackson). 

 Workers, July 1, 1915 (Plummer Id., Md., W. L. McAtee). 



2. Bremus bimaculatus (Cresson). 



A common species throughout the summer. The earliest and 

 latest dates of the capture of the three sexes are as follows: 

 Queens March 31, at Mt. Vernon, Va., on flowers of Salix searicea (W. L. 



McAtee) . 

 July 16, at Dyke, Va., on flowers of Pontederia cordata (W. L. 



McAtee). 

 Workers June 4, at Mt. Vernon, Va., on flowers of Diospyros virginiana (W. 



L. McAtee), and Beltsville, Md. 

 Sept. 12, at Beltsville, Md. 

 Males July 4, at Virginia near Plummer Id. (H. L. Viereck) . 



Aug. 1, at Mt. Vernon, Va. 



I have the following flower records for this species, but it must 

 be remembered that this data is incomplete. Bumblebees are 

 apt to visit almost any flower. 



Pontederia cordata Xolisma ligustrina 



Salix sericea Diospyros virginiana 



1 Trans. Am. Ent. Soc., Vol. 38. 



