BEMBIDIIN/E 5 



many of which were referred to the planatum group by Hayward. 

 Some assigned to the latter group by that author, such as nebras- 

 kense Lee., are also to be shifted to Peryphus. In the erasum group 

 is also included the irldescens group of Hayward. Affine does not 

 constitute a group but is to be referred to Notaphus, where it comes 

 near the Mexican cognatum of Dejean. Tigrinum Lee., should evi- 

 dently form a distinct and isolated subgeneric group. As shown by 

 the species festivum, recorded further on under the bifasciatum group, 

 the replacement of the usual two dorsal foveae of the elytra by three, 

 as seen in rickseckeri and scudderi, cannot be made the basis for 

 separate subgeneric groups and these will be found therefore under 

 the ustulatum and variegatum groups respectively. It should be 

 added that I have also adopted the plan of giving subgeneric names 

 to the various groups, as has been done in the recent European 

 catalogue of Heyden, Reitter and Weise. 



Our species may be assigned to the following sixteen groups, all 

 of which seem to be definitely subgeneric in character: 



Eighth elytral stria remote from the margin and subsimilar to the sev- 

 enth stria 2 



Eighth stria much less widely separated from the margin, except in the 

 nigruni and brevistriatum sections of the ustulatum group, sometimes 

 very close to the margin, and, as a rule more coarsely and deeply 

 impressed than the seventh 3 



2 Prothorax subquadrate; elytral foveae moderate in size, two in num- 

 ber as usual, sometimes within depressed and often more metallic 

 areolae I (litorale) 



Prothorax broadly cordiform, the two elytral foveae large and deep. 



II (b if oss ula turn) 



3 Humeri sharply angulate at base, the latter strongly margined for 

 some distance internally; prothorax almost as wide as the elytra, 

 subquadrate 4 



Humeri rounded, sometimes feebly angulate at base, the latter not mar- 

 gined, except by the more or less brief incurvature of the lateral 

 margin, which however is sometimes wholly obsolete, as in the 

 semistriatum group 5 



4 Striae regular and finely punctulate, though diminishing in depth 

 more or less rapidly and often obsolete laterad; intervals not 

 punctate; two dorsal punctures distinct and on the third interval; 

 mentum tooth sinuato-truncate at tip Ill (nitiduni) 



Striae wholly obsolete posteriorly, coarsely punctate basally, the surface 

 also with scattered setigerous punctures but apparently without 

 the usual two dorsal foveae; mentum tooth short, bilobed. 



IV (Iccvigatum) 



5 =Elytral striae impunctate, rarely punctulate, but then only very 

 finely or imperfectly 6 



