120 Bulletin Wisconsin Natural History Society. [Vol. 9, No. 3. 



and Massachusetts), so that in this case the geographical isolation 

 of semiaquca seems fairly complete. In as far as the material 

 would indicate I believe semiaquca to be an Appalachian species, 

 confined to the Atlantic coast, its distribution in many respects 

 analagous to that of Hrythrodiplax berenice. 



Length of abdomen 22-27 mm. Hind wing 24-27 mm. 



MATERIAL STUDIED. 



1. Color type il. 



Lumberton, N. C, April 7, 1903, C. S. Brimley ; coll. 

 Calvert. 



South Pines, N. C, March 9, 1910, C. S. Brimley; Mil- 

 waukee Museum. 



Same. 



Lumberton, N. C, April 7, 1903 ; coll. Sherman. 



White Lake, Bladen Co., N. C, mid-April, 1910; coll. 

 Sherman. 



Same. 



Same. 



Lumberton. N. C. April 7, 1903 ; coll. Brimley. 



South Pines, N. C, April 7, 1908 ; coll. Brimley. 

 G19-20. 9 $ South Pines, N. C, April 8, 1907, Brimley; coll. 

 Williamson. 



2. Color type i2. 



G3. $ Lake Ellis, N. C, May 14, 1906, C. S. Brimley; coil. 



Calvert. 

 Same. 

 Same. 



3. Color type i3. 



Clementon, N. J., C. J. Green; A. N. S. Phila. 



Lake Ellis, N. C, May 12, 1906, C. S. Brimley; coll. 



Williamson. 

 Same. 

 Same. 

 Same. 

 Same. 

 Massachusetts; coll. Williamson. 



