100 Bulletin 1, Biological Society of Washington, 1918. 



but a field station of the Division of Forest Insects is located 

 at Falls Church, and a number of entomologists live there, 

 so that we may hope to see the interesting insect fauna of 

 its environs further exploited. Only a single species of plant 

 seems to have its sole local station at Falls Church, namely, 

 Sabhatia cainpanulata. 



The Eock Creek region was explored more thoroughly by 

 the preceding generation of naturalists than by those of 

 today and good accounts of it are given by Coues and Ward. 

 It is mentioned here chiefly to call attention to the inter- 

 esting flora of \^'oodley Park. This area was diligently 

 scanned by Ward, Dr. E, S. Burgess and others and pro- 

 duced a number of plants not found elsewhere. It was long 

 the sole locality for i<oUdago rigida, which has since been 

 detected at Cabin John. At Woodley exclusively the fol- 

 lowing have been found : Phlox pilosa, Monarda mollis, 

 Helianthemum canadense, Aster concinnus, and Cirsium 

 odoratum. 



For the remainder of the Rock Creek region, the accounts 

 of Ward and Coues should be consulted. It is worth while 

 to repeat perhaps that Rock Creek has a good colony of our 

 most peculiar pine, Pinus pungens and that only one station 

 beside this region has been found for the orchid Triphora 

 triaiithophora and for Polemonium reptans. It should be 

 mentioned also that Rock Creek Park furnishes one of the 

 lowermost stations for the Piedmont Iris cristota, and that 

 the following plants, besides those named by Ward, have 

 been collected solely in this area : Meihomia pauciflora, M. 

 grandiflora, Diervilla diervilla and Aster tradescanti. 



It may be added that where Kalmia Street crosses Fen- 

 wick Branch there is a fine colony of Monarda punctata, 

 which in flower attracts numerous interesting insects. 

 Among the best species collected here are the flower-loving 

 beetle (Rhiplphorus pectinatus) , the bee {Calliopsis tricolor) 

 and the sphecid wasp (Proterosphex nudum). The whole 

 assemblage has Coastal Plain aflSnities and is here on the 

 fringe of its domain. 



Piney Branch, a tributary of lower Rock Creek, has been 



