420 MEMOIRS ON THE COLEOPTERA 



Seriatus Horn, is a very isolated species in elytral sculpture, but 

 in the peculiar structure of the head, front and eyes, it is in com- 

 plete harmony with prostans and others having close-set, even 

 and normal elytral sculpture. We perceived the same inconstancy 

 in elytral sculpture in the Distichalius group, showing that the 

 peculiarly sculptured elytra of Quedionuchus l&vigatus is not of 

 itself a distinctive generic character and is of little or no value 

 when considered apart from other structural features. Fulvicollis 

 under the name hyperboreus is said by Horn to occur from Maine 

 to Vancouver and northward, and this distribution is highly prob- 

 able in view of its holarctic habitat, but the species named pugetanus 

 above cannot be identical, or, apparently, even closely allied. 



Quedius sublimbatus Makl., probably belongs to this group but 

 is unknown to me; at first it seemed probable that it might be 

 the species described above as orbiceps, the elytra having similar 

 coloration, but they are there shorter than wide, while in sublimbatus 

 they are, according to Horn, longer than wide. 



Quediochrus n. gen. 



The quadrate head and notably moderate though ample and 

 unusually convex eyes, pallid coloration and more or less evidently 

 explanate sides of the prothorax, impart a rather peculiar facies to 

 the single species forming this generic or subgeneric group. It has 

 been found in caves but probably only seeks such seclusion during 

 the day, as there is no such extreme development of the erect tactile 

 setae, accompanying deficient eyesight, such as generally char- 

 acterizes true cave dwellers. I have in my collection the two 

 following forms: 



Form stout, rather convex, shining, pale testaceous throughout in color; 

 head large though much narrower than the prothorax, as long as 

 wide, the eyes prominent, at about twice their length from the con- 

 striction in both sexes; tempora parallel and straight, rounding bas- 

 ally; foveae, excepting the anterior, at a great distance from the eyes; 

 antennae rather long, thick but not distinctly incrassate, the outer 

 joints not quite as long as wide, the second much shorter than the 

 third; prothorax large, fully a fourth wider than long, continuously 

 rounded at the base and sides, the latter more converging and 

 straighter apically; surface broadly subdeplanate laterally, except 

 at apex, the three punctures of the series fine and feeble, the scutellum 

 very smooth; elytra quadrate, parallel, everywhere distinctly nar- 

 rower than the prothorax, having small but strong and close-set 



