104 Bulletin 1, Biological Society of Washington, 1918. 



Isanthus brachiatus Eupatorium hyssopifolium 



Piedmont Coastal 



Koellia mutica altissimum 



Coastal Piedmont 



Mecardonia acuminata Solidago racemosa 



Coastal Piedmont 



Utricularia gibba Baccharis halimifola 

 Valerianella chenopodifolia Coastal 



Piedmont Eclipta alba 



woodsiana Helianthus dowellianus 



Piedmont Piedmont 



At the upper end of the Chain Bridge flats is High Island, 

 formerly one of the best studied and most interesting spots 

 in the Washington region. It has since been spoiled and is 

 no longer a Mecca for biologists. Ward gives a fine account 

 of the island, and mentions also features of interest of the 

 Feeder Dam Island and other low islands just above High 

 Island.'''^ Of all the Upper Potomac Islands Plummer's 

 Island, the home of the Washington Biologists' Field Club, 

 is best known from a natural history standpoint. The Club 

 named has occupied the island since 1901, and one of its 

 chief objects, at all times, has been to work up the fauna 

 and flora of the island ^^ and nearby river valley. 



No fewer than 290 articles have been published that treat 

 at greater or less length the fauna of Plummer's Island. 

 Less has been recorded relating to the plants, but they have 

 been studied, and at least one new species Iresine rhizoma- 

 tosa described. In the articles upon the fauna up to and 

 including the year 1916 the approximate total number of 

 forms described from Plummer s Island was: species, 158; 

 varieties, 10 ; genera, 14 ; and families, 3. Two of the new 

 families have belonged to the Hymenoptera and one to the 

 Thysanoptera. 



'3 The valley of Cabin John Creek, which empties into the river from 

 the Maryland side not far above Higli Island, has proved to be a good col- 

 lecting place. Eryngium aquaticum has been found only here, and Soli- 

 dago rigida is shared with but one other spot. A number of species of 

 flies, mostly midges (Chironomidae) have been described from this valley, 

 and a new genus of deer flies, related to Chrysops, has been collected 

 only here. The same is true of the flower fly, Chilosiu cyanescens, and 

 another species, OrphnepMla testacea, the only representative of its fam- 

 ily in our region. 



'* See Members' Book of the Washington Biologists' Field Club. Re- 

 vised Edition, 1913. 



