166 PROC. ENT. SOC. WASH., VOL. 22, NO. 7, OCT., 1920 



Bras sic a sp. Hydrophyllum sp. 



Azalea nudi flora 



3. Bremus impatiens (Cresson). 



Common throughout the summer. The workers of this species 

 are extremely variable in size, the smallest bumblebee I have 

 ever taken (8 mm.) belonging here. This species and vagans are 

 perhaps the most abundant of local forms. 

 Queens April 16, at Mt. Vernon, Va. (W. L. McAtee). 



May 28, at Dyke, Va. 

 Workers June 30, at Eastern Branch, near Bennings, D. C. 



Oct. 11, at Spring Hill, Va. 

 Males July 12, at Plummer Id., Md. 



Oct. 28, at Cabin John, Md. (R. C. Shannon). 



The queens of this species seem to disappear early in the year,, 

 though there should be some out in the fall. The workers are 

 very abundant from early July to late September. In October 

 the males are practically the only representatives of the Bremidae 

 to be found. October 24, 1915, at Chain Bridge, Va., I saw 

 fully two dozen flying around a small group of asters. 



I have the following specific flower records, although this species 

 feeds on almost every flower. 



Pontederia cordata Chrysopsis mariana 



Xolisma ligustrina 



4. Bremus perplexus (Cresson). 



No representatives of this species have been recorded from this 

 locality, but on the chance that it might be picked up, it has 

 been included in the keys. It has been taken to the south (Pen- 

 nington Gap, Va.), although it is a northern form. If found it 

 will probably be in the higher parts near Great Falls, Va. 



5. Bremus vagans (F. Smith). 



A common species from May to October. 

 Queens April 28, on and near Plummer Id., Md. 



July 12 at Plummer Id., Md. 



Oct. 30, at Cabin John, Md. (R. C. Shannon). 

 Worker June 9, at Beltsville, Md. 



Oct. 31, at Great Falls, Va. (R. A. Emmons). 

 Male July 7, at Virginia, near Plummer Id., Md. 



Oct. 11, at Spring Hill, Va. 



The queens were abundant on April 28, and close collecting a 

 trifle earlier would probably have shown them present. The 

 questionable record is either a small queen or large worker, prob- 

 ably the latter. The worker from Great Falls is the latest date 

 I have taken bumblebees in this region. 



