with the sides paler. Elytra yellow, each with four narrow black discal vittae 

 and fragments or traces of one or two others external to these; the suture also 

 extremely narrowly margined with black. Body beneath black; antennae, legs 

 and epipleura rufous. Elytral reticulation rather lightly impressed, the meshes 

 large, and each, as a rule, with one or two very fine punctures. Protarsal claws 

 of male rather slender, the anterior one distinctly but obtusely angulate beneath 

 at about the basal third. Length 7.5 mm. 



This very rare species is represented in the LeConte collection by 

 the unique type taken by Murray in California, precise locality not 

 stated. Aside from the type I have seen only a single example collected 

 by G. R. Pilate at Mills College, California, and sent me for identifica- 

 tion by Mr. Dury, who retains a second specimen in his own cabinet. 



A. austini Shp. On Dytiscidae, p. 516. 



Form varying from oval to somewhat obovate; above brownish testaceous, the 

 margins diffusely paler, at least in the darker specimens; surface shining, not 

 or only slightly less so in the female; beneath piceous, prosternum and abdomen 

 more or less paler, legs and antennae rufous, Elytral reticulation coarse, fine 

 punctulation almost wanting. There is a minute obscure secondary system of 

 reticulation visible only under considerable amplification. Pro- and mesotarsi of 

 male narrowly dilated, the glandular hairs tipped with small rounded palettes; 

 protarsal claws equal, elongate, nearly straight, feebly sinuate on their lower 

 edge. Length 8.2 to 9 mm. 



A rather common species in the Rocky Mountain .and Plateau region, 

 ranging from Idaho and New Mexico West to British Columbia, 

 Eastern Washington and Eastern California (Truckee). There are 

 specimens in the Sherman collection from Gaston, Northwest Oregon, 

 which is its closest approach to the Pacific Coast known to me. The 

 type is from British Columbia, but precise locality is not named. 



A. strigulosus Cr. Trans. Am. Ent. Soc. IV, 1873, p. 422. 

 nanus Lee. Bull. Geol. Surv. IV, 1878, p. 452. 



Narrowly oval; black, head and thorax slightly bronzed; elytra fuscous or 

 brownish with margins paler ; legs rufous, hind thighs more or less inf uscate, 

 the others rarely so. Elytral reticulation lightly impressed, the meshes large and 

 unequal, with a minute secondary reticulate ground sculpture. Hind thighs with- 

 out, or with at most only a short basal row of punctures along the inner margin. 

 Pro- and mesotarsi distinctly incrassate in the male, the glandular hairs tipped 

 with a dense mat of minute palettes anteriorly and with much larger ones in 

 posterior half. Protarsal claws of male slender, feebly sinuate. Length 6.2 to 

 6.6 mm. 



Crotch's type was from Lake Tahoe, California. Examples are 

 known to me also from Corvallis and Gaston, Oregon ; North Yakima, 

 Washington (Sherman collection) ; Vancouver Island ( Wickham) ; 

 Terrace, British Columbia (Mrs. Hipplesey) ; Overland Lake, Boulder 

 Co., Colorado (Rohwer). LeConte's type of nanus was from Floris- 

 sant, Colorado, 8,000 feet. 



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