104 JOHN HAMILTON, M. D. 



89. Graphoderes fasciatocoUis Harris, cinereus Linn., elatns perplexus Sharp 

 (T. X, 280). 



Inhabits Pennsylvania (here), New York, Massachusetts, Michigan, 

 northern California, Washington Territory, Red River, [Manitoba.] 

 Europe. West Siberia. Turkestan. T. iv, -403 ; Can. Ent. xx, 62 ; 

 Sh., 698-95 ; Heyden, 59. 



GYRINID^. 



90. Gyrinus minutus Fab. 



This appears to be a northern species. Square Island, Labrador 

 Packard; Hudson Bay region, Kirhy ; Lake Superior, Michigan, 

 Washington Territory, from which I have specimens. Central and 

 northern Europe Arctic, west and east Siberia (Spirina, the Chan- 

 taika River, Omsk). Pr. 1868, 372 ; Heyden, 60. 



Obs. — G. Rockinghamensis Zimm. seems to differ only by having 

 the underside entirely pallid, but is approached in this respect so 

 closely by individuals of minutus as to render the separation oi)in- 

 ionative. It is abundant from New York to Florida. 



91. G. marinus Gyll., var. dorsalis Gyll., var. opacus Sahib. 



The variety opacus occurs in Greenland (Pr. 1868, 372), but further 

 record of its occurrence in America has not been observed. Central 

 and northern Europe. Many places in Arctic, east and west Siberia 

 and Turcomania. Heyden, 60. 



HYDROPHILID^. 



92. Helophorus graniilaris Linn. 



This species seems to have only a catalogue record in our literature. 

 There are many varieties in Europe. It occurs in west Siberia ; 

 Mongolia ; Turkestan. Heyden, 61. 



93. H. tuberculatus Gyll.., scaher Lee. 



This species is "very abundant at Lake Superior," LeConte. 

 New York, Canada, Michigan, Wisconsin. Germany, northern 

 Europe. Siberia (the Obi and Jenisei). Mongolia. P. vii, 358 ; 

 Heyden, 61. 



94. Tropisternus apicipalpis Chev. 



This species "occurs in Arizona, the peninsula of California, and 

 in Mexico," Horn, Can. Ent. xvii, 138. It also inhabits southern 

 France. 



