of male both evidently sinuate, the anterior one more curved apically. Length 

 6.7 to 7.7 mm. ; width 3.8 to 4.2 mm. 



Of this species I have seen a good series collected by Mr. J. B. Wallis 

 at Winnipeg and Aweme, Manitoba. There is also before me one 

 example labeled "East Ontario." The type is a male from Aweme, 

 and is in the writer's collection. 



A. subfuscatus Shp. On. Dytiscidae, p. 514. 



Of the same type as the several preceding species, but differing from them by the 

 very minute and everywhere similar and virtually equal areolae of the elytral 

 reticulation. The minute punctules are evenly distributed over the elytra and 

 are more easily discernible than in the species mentioned, each punctule occupy- 

 ing the center of one of the minute areolae, which it so nearly fills as to preclude 

 the occurrence of a second punctule in the same area. The four anterior tarsi of 

 the male are, as in the preceding species, but little dilated, but the protarsal claws 

 are here more noticeably modified, the inner edge of the anterior claw being a 

 little sinuate, while that of the posterior claw is broadly, obtusely, but perceptibly 

 angulate at the apical third, when observed from the proper view point. This 

 slight angulation of the posterior claw was overlooked by Sharp, but it is ob- 

 vious enough on careful inspection and at once distinguishes the present species 

 from the numerous similar ones which are likely to be confused with it. The 

 elytra are typically broadly infuscate with paler margins, but are sometimes of a 

 uniform brownish yellow tint. Length 7.3 to 8 mm. 



The type locality is "Massachusetts." In the series before me the 

 following localities are represented. "New Hampshire ;" Lake of the 

 Clouds, Mt. Washington, New Hampshire; Massachusetts (Tyngsboro 

 and Nantucket) ; Connecticut (Orange) ; Quebec (St. Jean) ; On- 

 tario (Toronto, Ottawa and Belville) ; Michigan (Agricultural Col- 

 lege) ; Illinois (Liebeck collection). 



A. phaeopterus Kby. Fauna Bor. Amer., Ins., 1837, p. 70. 



This species of Kirby has never been certainly recognized by subsequent writers, 

 though its identity with discolor, ambiguus, congener and perhaps other species 

 has been suggested at various times. Thanks to Mr. Arrow I have been privi- 

 leged to study one of Kirby's two original specimens, and am thus able to fix its 

 position in our series. The meshes of the elytral reticulation are minute and 

 regular as in subfuscatus and bicolor, with which it must be closely associated. 

 The minute punctulation of the elytra is precisely as in subfuscatus, but the size 

 is smaller than in that species, and the protarsal claws of the male are less modi- 

 fied, agreeing very nearly in this respect with congener, discolor and inscriptus. 

 The elytra in all specimens seen show very little discal infuscation, the color 

 being nearly uniformly brown or yellowish brown. Length 6.5 to 7.3 mm. 



Kirby's type is from the region west of Hudson Bay "in latitude 

 54." Precisely or closely similar examples have been seen from 

 Bayfield, Wisconsin (Wickham) ; Marquette, Michigan (Sherman) ; 

 Duluth, Minn.; Winnipeg; mile 332 Hudson Bay R. R., Manitoba 

 (Wallis) ; Edmonton/Alberta (Carr). 



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