102 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



well to draw attention to a method of labelling specimens from 

 the vicinity of Plummers Island which has resulted in erroneous 

 records being published. This is the use of red-spotted Plum- 

 mers Island labels for specimens not taken on the island. The 

 red spots were placed so as to indicate (map-wise) the direction 

 from the island of the place where the specimens were taken. 

 This system has been superseded by the use of labels such as 

 "Maryland near Plummers Island" and others as required. 



The working up of the fauna of Plummers Island has been 

 one of the principal objects of the Washington Biologists' Field 

 Club since it occupied the island in 1901. The present paper is 

 the second formal list of insects for the island, the first being 

 "An Annotated List of the Thysanoptera of Plummers Island, 

 Maryland", by J. D. Hood (Ins. Insc. Mens. 5, Nos. 4-6, April- 

 June", 1917, pp. 53-65). The species of syrphid flies, occurring 

 upon Plummers Island and in the neighborhood, are indicated 

 in "District of Columbia Diptera: Syrphidae," by Nathan Banks, 

 C. T. Greene, W. L. McAtee, and R. C. Shannon. (Proc. Biol. 

 Soc., Wash., 29, 1916, pp. 175-6.) 



DERMAPTERA. 



Labiidae. 

 Labia minor Linnaeus. 



Apparently scarce; taken on Plummers Island, July 4, 1900, at 

 light, H. S/ Barber; September 10 and 24, H. S. Barber and E. 

 A. Schwarz, and on Maryland shore near Plummers Island, May 

 23, 1915, McAtee. 



Forficulidae. 

 Doru aculeatum Scudder. 



A single female nymph of a Doru was taken by McAtee while 

 sweeping vegetation in a swamp near Great Falls, Ya.. August 

 11, 1915. The identity of the species was in doubt until at the 

 same spot October 4, 1916, the same collector obtained numerous 

 adults of both sexes. They were sitting on sedge stems. 



ORTHOPTERA. 



Blattidae. 



Ischnoptera couloniana Saussure. 







Chain Bridge, Va. (Rehn & Hebard, 1910, p. 436). 



