epipleura with pale outer margin; legs almost entirely rufous, the femoral in- 

 f uscation feeble ; otherwise as in morosus. Length 6.5 to 6.8 mm. 



Described from a good series of specimens (Sherman collection) 

 from Gaston and Corvallis, Oregon. The type is a male from the first 

 named locality, and is in my own collection. 



A. obliteratus Lee. Smithson. Cont. Knowl. XI, 1859, p. 5. 



Again very closely related to morosus, and also to ancillus. Similar in size to the 

 former, but more evenly oval, more narrowed in front, the prothorax conse- 

 quently appreciably smaller. General color and sculpture nearly as in morosus, 

 the elytra, however, are typically uniformly yellow brown, and as a rule are rather 

 paler than in that species ; epipleura piceous with pale outer margin, as in ancillus. 

 Sexual characters as in morosus and ancillus. Length 7 to 8 mm. 



Occurs in the Rocky Mountain region from Wyoming to New Mexico. 

 I have seen examples from Ft. Laramie (type) and Cheyenne, Wyom- 

 ing ; Gunnison County, Ouray, Georgetown, Salida, Denver, and Buena 

 Vista, Colorado; Ft. Wingate and Jemez Springs, New Mexico. 



A. congener Payk. Fauna Suecica I, 1798, p. 214. 



Subelongate oval, black, elytra brownish fuscous with dilute margins, upper sur- 

 face usually feebly aeneous ; epipleura and apices of ventral segments pale ; 

 antennae rufous with outer joints partially infuscate; last joints of palpi more 

 or less dusky or blackish except at base ; legs rufous, the femora largely piceous. 

 Elytral reticulation rather fine but quite distinct under moderate power, usually 

 appreciably stronger in the female, the meshes irregular and unequal throughout ; 

 minute punctules sparse and occurring for the most part within the areolae, but 

 only detectable upon close observation. Metasternal length between meso-coxae 

 and coxal plates unusually great, being evidently more than half the length of the 

 latter. Male pro- and mesotarsi rather feebly dilated, the protarsal claws some- 

 what elongate, slender, little curved except at tip, the hinder one a little sinuate 

 beneath. Length 7.5 to 8.4 mm. 



This species is evidently abundant in Labrador, judging from the 

 nemerous specimens from several localities received by Mr. Sherman. 

 It is also common according to Sherman in the small lakes above 

 the tree line in the White Mts of New Hampshire. A single female 

 from Ruby, Alaska (Kusche) in my own collection is here referred 

 with some confidence. According to Sharp, congener is in Europe a 

 wide spread "arctic, alpine and sub-alpine species," and is there said 

 to vary in color, size and form, and extremely so in the sculpture of 

 the female. No very great variation of this sort has been observed 

 among the American representatives of the species. 



In color and other general features congener is typical of a group 

 of species between which it is more than usually difficult to discriminate. 

 These species have in consequence been badly muddled by collectors 

 and systematists alike. For instance: Zimmermann, in his recent 

 paper on "Die Schwimmkafer des Entom. Mus. in Berlin-Dahlem" 



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