14 JOHN HAMILTON, M. D, 



153. A. Lecontei Crotch, discolor || Lee, 1852; phseopterus J Mann., not Kirby, 



D 71. — Afoguak, Kenai, California; ? var. at Alamosa, on the Rio (irand, 

 at 7600 feet. 



154. A. scapularis Mann., D 25. — Sitkha, British Columbia. 



155. A. anthracinus Mann., D 26, Dp, 272, two varieties. — Kenai, Sitkha, 



Canada, Hudson Bay, Sharpe. This species is considered by Dr. Horn as 

 probably synonymous with scapidaris 1. c. 



156. A. conflnis Gyll., bicolor Kirby, phseopterus Kirby, not Mann, ; ovoideus 



Lee, D 70. — Afognak, Sitkha, Lake Superior to Lat. 54°, Canada, Vermont, 

 Michigan, Kansas, Siberia, northern Europe. 



157. A. subopacus Mann., D 67. — Kadjak. 



158. Rhantus divisus Aube, A 93, Dp, 271, two varieties. —Various places in 



Kenai, Sitkha, Oregon. 



159. Colymbetes dolobratus Payk., D 65. — Kadjak, Kenai, Hudson Bay 



Kamtschatka, Arctic Siberia; Lapland, Finland, Sweden, Norway. Ac- 

 cording to Dr. Eegimbart, Ann, Soc. Ent. France, 1889, p. xviii, there are 

 three other varieties: var. Groenlandicus Aube, Labrador, Greenland, Ice- 

 land ; var. Drewseni Lee, Greenland ; var. Thomsoni Sharp, Iceland, Lap- 

 land. The European catalogue, ed. iv, has Groenlandicus as a true species. 



160. C obscuratus Mann., D 64, two varieties. — Kadjak. Differs from C. Pay- 



Imlli Er. by the finer and denser transverse striolse of the elytra. 



161. Dytiscus anxius Mann., A 91. — Sitkha, Oregon, Canada, Hudson Bay. 

 Note. — This may be a variety of circumcinctiis Ahr., with which Mannerheim 



compares it, a species of northern Siberia and northern Europe said by 

 Dr. Sharp to occur on Red River [Manitoba]. 



162. D. parvulus? Mots., Mann. — Common on Kadjak. 



163. D. dauricus Gebl., conjluens Say. Franklinii, Oolighnhii Kirby, diffinis Lee, 



C 24, D 62, two varieties. — Unalaschka, Kadjak, the main land adjoining 

 the peninsula of Kenai, Lake Superior region northward to Lat. 55°, 

 Canada to Maine, Vermont, Michigan, Wisconsin, Kansas, Colorado; 

 Kamtschatka to Dauria. 



164. Acilius abbreviatus Mann., A 92, D 61.— Atkha, Kadjak, Sitkha. Man- 



nerheim considered this a true species distinct from semisiilcatus Aube, 

 Dej., of which now it is made a variety, together with simplex Lee, orego- 

 nensis Crotch and latiusculus Lee; semiuscusculus is distributed generally 

 throughout North America and some of the West India Islands (Crotch, 

 Sharpe). 



GYRINID^. 



165. Gyrinus picipes Aube, A 101, D 80, two varieties. — Kadjak, Sitkha, Queen 



Charlotte Island, British Columbia to Labrador, Vermont, Michigan, 

 Idaho, Oregon. 



HYDROPHILID^. 



166. Helophorus ang-ustulus Mann., D 82. — Kadjak, Kenai. 



167. H. inquinatus Mann., C 118. — Sitkha, Lake Superior ; var. consimilis 



Mann., D 81, two varieties. — Fort Constantiue (Chtagaluk). Various 

 places on Kenai. 



168. H. auricollis I^sch., A 188. — Unalaschka. 



