APPENDIX : BUTTERFLIES OF PROBABLE OR POSSIBLE 

 OCCURRENCE IN THE DISTRICT 



In addition to the butterflies actuall}'^ recorded from the District 

 and discussed in the preceding pages, there are a number of others 

 which are to be looked for here as casuals, as occasional temporary 

 residents, or as very local residents which heretofore have escaped 

 detection. Among these, those listed in the following pages are 

 worthy of special mention. Practically all of them occur regularly, 

 or at least frequently, in localities which can be reached in half a day 

 or less by automobile from Washington. 



The inclusion of such northern species as Vanessa Tnilberti, Poly- 

 gonia f annus, Argynnis atlantis, and Strymon acadica perhaps calls 

 for a word of explanation. As was noted in the introduction, the 

 District area is strongly northern in its affinities, no less than 14 

 species here reaching their extreme southern limit at sea level. The 

 heavily wooded cold boggy areas, such as the Paint Branch Valley, 

 near the District are as yet very imperfectly known. In some local- 

 ities in these areas conditions are such as to make one suspect that 

 these insects might occur, and they are included herein in the hope 

 that in the future a careful search will be made for them. 



With the increasing extension of the suburbs of the city of Wash- 

 ington and the progressive clearing of the surrounding country, an 

 increase in the number of southern and western species and a decrease 

 in the number of the northern are to be expected. It is to be hoped, 

 therefore, that the valle3^s of the cool woodland streams about the 

 District will be thoroughly searched before it is too late. 



I am greatly indebted to Dr. William T. M. Forbes for his kind- 

 ness in going over for me the list of species included in the following 

 pages. 



Family NYMPHALIDAE 



Subfamily Satyrinae 



NEONYMPHA GEMMA Hubner 



Plate 2, Figures 4, 5 



This species, easily recognizable by the silver markings along the 

 margin of the underside of the hind wings, may occur in the District. 



NEONYMPHA PHOCION (Fabricius) 



Plate 2, Figures 2, 3 



This species is more likely to be found in the District than the 

 preceding. It is easily recognized by the large oval spots on the 



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