290 MEMOIRS ON THE COLEOPTERA 



necessary to replace the name of the European memnonius Er., by 

 luctuosus Mars. 



Not having seen the paper (Ann. Mag. Nat. Hist., 1898, II) in 

 which Mr. Lewis describes two species, listed as from "North 

 America," belonging to the subgenus Spilodiscus (ante p. 206), I 

 inadvertently omitted them from the table. They both belong to 

 the militaris section of the subgenus, having an unusually broad 

 head, generally feebly impressed anteriorly and with entire stria, 

 short apical outer lateral thoracic stria, three entire dorsal, short 

 and apical fourth and fifth, longer but medial sutural and obsolete 

 humeral, striae, and tridentate anterior tibiae. On reading the 

 descriptions of sarcinatus and tunicatus Lewis, and reinvestigating 

 my material in militaris and qiiadralulus, I find an unexpected 

 variety of forms, presumably specific; in fact there are three com- 

 bined under my former conception of qiiadratulus, no one of which 

 seems to be the same as either of the Lewis species, the chief 

 differentiative characters residing in the pygidial sculpture, nature 

 of the mesosternal sinus and its paralleling stria and the size and 

 general outline of the body. 



Militaris Horn, is the largest of the section, oval, convex, with 

 the propygidial punctures coarse and sparse, those of the pygidium 

 distinct, strong and moderately separated throughout, somewhat 

 coarser basally and finer apically, the apex impunctate, the meso- 

 sternal sinus deep, rather narrow and sharply defined, the parallel 

 stria more distant from the edge laterally than along the sinus. 

 In the last character it agrees with tunicatus, from Canon City, 

 Colorado, but there the size is smaller 4.5 mm. and the pygidial 

 punctures are apparently finer and less conspicuous. In sarcinatus, 

 from Winslow, Arizona, the mesosternal sinus is broader and shal- 

 lower and the stria is equidistant from the edge from side to side, 

 as in quadratulus, but in the former the body is 5.25 mm. in length 

 and the pygidial punctures become gradually fine apically. In 

 giiadratulus, represented only by three examples from Fort Wingate, 

 New Mexico, the size is much smaller 4.2-4.5 mm.- the form 

 oblong and but slightly oval, and the pygidial sculpture is peculiar; 

 the punctures are not large but distinct, sparse and limited to about 

 basal two-fifths medially to rather more than half at the sides, the 

 rest of the surface virtually impunctate. My example from Las 



