1875.1 79 



4. Leucorhinia glacialis, d\ (No description.) 



Hab. Michipicoten, Lake Superior; Massachusetts; White Mts., 

 N. H. 



5. Leucorhinia proxima, d". (No description.) 



Hab. British America; Victoria, Vancouver's Island; Massachu- 

 setts; White Mts., N. H. 



6. Leucorhinia frigida, $. (No description.) 



Hab. Northern Red River ; Massachusetts ; Ontario, Canada. 



DlPLAX. 



1. Diplax assimilata, d, ?. 



Libellula assimilata Uhler? Proc. Acad. Philad., 1857, 88, 6. 



Diplax assimilata Hag! Syn. 174, 1 ; Stett.Z., xxviii, 93. — Walsh 

 Proc. Acad. Philad., 1862, 400. 



Hab. Chicago, Rock Island, Illinois ; Washington ; St. Louis. 



The localities Wisconsin, Pennsylvania, Maryland, are added by 

 Mr. Uhler ; I have not seen specimens. I have not examined Mr. 

 Uhler's types from Fort Union, Nebraska ; perhaps they belong to 

 the following species. Therefore I retain the name D. assimilata for 

 the species described in my Synopsis. 



2. Diplax interna, d\ ?. (No description.) 



Hab. Saskatchewan, Southern Lake Winnipeg, British America • 

 Wisconsin; Minnesota; N. Dakota; W 7 hite Mts., N. H. 

 Perhaps this species is D. assimilata from Nebraska. 



3. Diplax rubicundula, d", ?. 



Libellula rubicundula Say, Journ. Acad. Philad., vm, 26, 14. 



Diplax rubicundula Hag.! Syn., 176, 6 ; Proc. Bost. Soc. Nat. Hist. 

 XV, 267, 17 ; 377, 10 ;— Scudder! Proc. Bost. Soc. Nat. Hist., x, 219. 



Hab. Massachusetts, October ; Maine ; Mt. Washington, N. Hamp- 

 shire, August, September; New York; New Jersey; Pennsylvania* 

 Maryland; Washington, D.C.; Michipicoten, Lake Superior and 

 British America; Indiana (Say). 



A careful examination of a large number of specimens induces me 

 to separate again the species described by me as D. assimilata and 

 D. rubicundula, united in an elaborate paper by Messrs. Scudder 

 Uhler and Walsh. 



4. Diplax obtrusa, e. 



Hagen! Syn., 177, nota after D. rubicundula ; Stett. Z.,xxvm, 95. 

 Hab. Mass.; Chicago, Illinois; Ontario, Canada, perhaps not 

 different from D decisa. 



