NATURAL SCIENCES OF PHILADELPHIA. 315 



Massachusetts. Mr. P. S. Sprague. Smaller and narrower 

 than P. femoralis^ with the legs entirely ferruginous. In one 

 specimen there is a very faint and small outer basal impression. 



70. Argutor bicolor Kirby, ih. The type agrees with P. patrue- 

 Lis, except that the outer elytral striae are less impressed, and the 

 basal foveas of the prothorax less deep. These differences seem 

 to 1)6 individual. 



73. P. viNDiCATUS Mann. As exhibiting the uncertain and opin- 

 ionative character of the species of the Crj'obius group, I will give 

 a list of the specimens upon which I have based the table above 

 printed, and the sources from which they have been derived. 



86. A. hrevicornis Kirby, ib. The type seems not distinct from 

 cue specimen of A. mandibularis ; the other specimen of the latter 

 is more elongate, more bronzed, less convex, with the elytral striae 

 deeper, and dorsal punctures less evident. These differences do not 

 seem to me specific. P. fastidiosus Mann, is a smaller and stouter 

 race, with the hind angles of the prothorax less defined, and P. 

 oclioticus an equall}'^ small and stout race, with the hind angles 

 more prominent. 



P. VINDICATUS, 2 spec. Chaudoir, Mnizsech. Kadjak. 



P. VENTRicosus, 1 spcc. Chaudoir. Sitka. 



P. suBEXARATUS, 2 spec. Muizscch, Maeklin. Unalaska. 



P. PiNGUEDiNEUs, 1 spec. Chaudoir. Sitka, 1 spec. Motsch. 

 (as ventricosus). 



P. HYPERBOREUS, 1 spcc. Muizscch. Island St. George. 



P. HUDSONicus Lee. 1 spec, Ulke, Hudson's Bay Terr., 3 spec. 

 Sprague, Mount Washington, N. H. ; 1 (smaller) Lake Superior ; 

 3 sp. Motschulsky, Alaska. (2 as jyinguedineus, 1 as empetricola.) 



P. siMiLis, 1 spec, Mnizsech. Island St. George; 1 Motschul- 

 sky (as P. quadricollis). 



P. FATUUS, 2 spec. Ciiaudoir. Sitka. 



P. RiPARius, 3 spec. Chaudoir. Mnizsech, Sitka, Kadjak, 

 Kenai; and 1 spec. Motschulsk}' (as P.fatuus). 



P. CONFUSUS, 2 spec. Menetries. 



P. SUBCAUDATUS, 2 spcc Chaudoir, Mnizsech. 



P. EMPETRICOLA, 1 spec. Chaudoir, Sitka; 2 Hudson Bay Terr. ; 

 1 Motschultsky, Kenai; 2 sp. Motschulsky (1 as fastidiosus, 1 as 

 ^7'igidus?). 



P. MANDIBULARIS, 2 spec, Lake Superior; 2 sp., Fort Simpson ;. 

 1 spec. Sprague, White Mountains, N. H. ; 1 Ulke, Kenai ; 2 spec 



