Dytiscidae 261 



Nov-Dec, Geneva, Mar (Cls) ; Ithaca, Ap-May, Jl-Aug, Oct 

 (ShermCU); Albany, Karner, Je (NYS) ; Hermitage, Jl (Mat); 

 White Plains, Mar 30-Oct 11 (Sq) ; NYC (AM) ; SI, Ap-Je (L&D) ; 

 LI (Sherm). 



SUBFAMILY DYTISCINAE 



DytISCUS Linnaeus 



2636 D. fasciventris Say. Oswego, Oct, Bks (NYS) ; Buffalo (Z&R) ; E. 



Aurora, Sep, in ponds, scarce (Dnd) ; Avon, Dec (Cls) ; Batavia, Jl 

 (Kngt) ; Canandaigua L., Jl 11 (ShermCU) ; Canandaigua (NYS) 

 Ithaca, Je-Aug (ShermCU) ; Utica, Nov (LintNYS) ; Washington Co 

 (Sherm) ; Albany, Oct (LintNYS) ; Chatham, Nov (NYS) ; West Pt 

 (Robn) ; Peekskill (Sherm) ; White Plains, Oct (Sq) ; NYC (L&B) : 

 SI, Ap, Je, Nov (L&D) ; LI: Orient Pt. (NYS) ; Astoria (AM). 



2637 D. hybridus Aube. Keene Val., Nov (Not) ; Oswego, Oct, Bks (NYS) 



Olcott, Jl (Dt) ; Buffalo (Z&R); Pike (Sherm); Niagara R., May 

 (Dnd) ; Canandaigua, Jl (NYS) ; Orchard Pk., Jl (NYS) ; Ithaca 

 Jl-Aug, Oct (ShermCU); McLean, Oct 21 (ShermCU); West Pt 

 (Robn); White Plains, Mar 19-Sep 6 (Sq) ; NYC (L&B); SI, Jl 

 Sep-Oct (L&D). 



2638 D. verticalis Say. Keene Val., Saranac Inn, Jl (NYS) ; Gloversville, Sep 



(NYS) ; E. Aurora, Buffalo, Aug, frequent (Dnd) ; Pike (NYS) ; 

 Canandaigua L., Jl (NYS) ; Ithaca, Jl-Aug, Oct (ShermCU) ; Mc- 

 ■ Lean Bogs, Aug (Vdyk) ; Albany, Aug, Nassau, Jl (NYS) ; Esopus, 

 Peekskill (Sherm) ; West Pt. (Robn) ; White Plains, Oct (ShermCU) ; 

 Van Cort. Pk., Aug (ShermCU) ; NYC (L&B) ; SI, Mar-May, Jl 

 (L&D); LI: Forest Pk. (Sherm). 

 2641 D. marginalis L. Avon, Dec (Cls) ; Canandaigua, Jl, Pike, Ap (NYS) ; 

 Ithaca, Sep (Dt) ; Pittstown, Je (ShermNYS). 



2645 D. dauricus Gebl. Ithaca, Aug 28 (ShermCU). 



2646 D. harrisii Kby. Adirondacks, Sep (Eng) ; Wells, Aug (NYS) ; Olcott, Jl 



(Dt) ; Buffalo (Z&R) ; E. Aurora, Jl, in ponds, scarce (Dnd) ; Aurora, 

 Ap, Bish (NYS) ; Johnsburg, Sep (NYS) ; Caledonia Cr., Dec (Lee) ; 

 Geneva, Jl (LintNYS); Ithaca, Jl, Oct (ShermCU); McLean, Oct 21 

 (ShermCU); Hadley, Feb (NYS); Utica, May, Chatham, Nov 

 (NYS) ; East Branch, Aug, Ds (Ang) ; Saratoga Sps., Oct 

 (LintNYS); LI: Forest Pk. (Eng). 



SUBFAMILY HYDATICINAE 

 Hydaticus Leach 



2647 H. stagnalis Fab. Buffalo (Z&R) ; Ithaca, Mar, Aug (Dt) ; New Salem, 



Ap, Bish (NYS); Karner, Jl (NYS); Peekskill, Sep (Sherm); 

 White Plains, Ap (Sq) ; near NYC (L&B) ; SI, Ap-May (L&D). 



2648 H. laevipennis Thorn. Syracuse, May (H). 



2649 H. piceus Lee. Ithaca, Sep (Dt) ; West Pt. (Robn) ; Peekskill (Sherm) : 



White Plains, Ap 22-May 20 (Sq) ; Van Cort. Pk., Oct (Lg) ; SI. 

 Ap, Je, Aug, Oct (L&D). 



2650 H. bimarginatus Say. Near NYC (L&B) ; SI, Je (L&D). 



