530 THE I'HICAGO ACADEMY OF SCIENCES. 



21-23. Galba cmarginata ontaricnsis ("Muhlf." Kuster). Rose Hill 



Cemetery. Buffalo, N. Y. (23758). 

 24-25. Galba cmarginata ontariensis ("Muhlf." Kuster). Fort Erie 



Grove, near Buffalo, N. Y. (23688). 

 26-27. Galba cmarginata ontariensis ("Muhlf." Kuster). Stoney Island, 



Saginaw Bay, Mich. (24505). 

 28. Galba cmarginata ontariensis ("Muhlf." Kuster). Pigeon Lake, 



Ontario (23317). 

 29-30. Galba pilsbryana (Walker). Isle Royale. Immature. Cotypes 



(23672.) 

 31. Galba pilsbryana (Walker). Washington Harbor, Isle Royale, Mich. 



Type (Coll. Walker, 21345). 

 Figures 1, 16-28, a trifle enlarged; other figures natural size. 



PLATE XLYI. 



Figures 1-4. Galba contracta (Currier). Higgins Lake, Roscommon Co., Mich. 

 (Topotypes, 24538). 

 5-8. Galba montana (Elrod). Mission Mts., Montana. (Topotypes, 



23709). 

 9-11. Galba binneyi (Tryon). Lake Louise, Alberta. (Coll. Phil. Acad. 

 Sci., 91207). 



12. Galba binneyi (Tryon). Sawtooth Lake, Idaho. (Coll. Smith. Inst.). 



13. Galba randolphi (Baker). Marsh Lake, Dyea Valley, Yukon Terri- 



tory. (Type, 23089). 



14-15. Galba alaskensis Baker =scalaris West. Vega Exp., IV, pi. 4, 

 figs. 13, a, b. 



16-17. Galba anticostiana (Dall). Marl Lake, Anticosti Island. (Co- 

 types, 23875). 



18-24. Galba nashotahensis (Baker). Marl beds, Nashotah, Wisconsin. 

 (Types, 24539). 

 Figures 1-4, 9-24, slightly enlarged; figures 5-8, natural size. 



PLATE XLVII. 



Figure 1. Galba oronensis (Baker). Orono, Maine. Cotype (23784). 



2-3. Galba oronensis (Baker). Orono, Maine. Types (Coll. Walker, 



7912). 

 4-8. Galba oronensis (Baker). Aroostook River, Caribou, Maine 



(23786). 

 9. Galba oronensis (Baker). Ottawa, Canada. ( Coll. Walker, 2540). 

 10. Galba catascopinm (Say). Calumet River, Chicago (23875). 

 11-12, 14-18. Galba binneyi (Tryon). Lake Superior (23716). 

 13. Galba binneyi (Tryon). Lake Superior (23715). 

 19-22. Galba apicina (Lea). Lake Superior (23718). 

 23-24. Galba apicina (Lea). Union River, Mich. (23719). 

 25. Galba apicina (Lea). Brule River, Iron Co., Mich. (Coll. Walker, 

 22924). 



26-27. Galba apicina (Lea). Twin Falls, Iron Co., Mich. (Coll. Walker, 

 22934). 



