2 MEMOIRS ON THE COLEOPTERA 



many wanderings through widely separated parts of the country. 

 The material before me is for these reasons notably full, so that I 

 have been obliged to recognize some 437 species and subspecies 

 composing it, which number must be increased by about 82 that 

 are not at present in my collection, making in all 519 species and 

 subspecies, or about 2.6 times as many as were admitted by Mr. 

 Hayward and subsequent authors. The species and subordinate 

 categories given as valid in the most recent European catalogue 

 amount to somewhat over three hundred. The continent of North 

 America should not, however, be compared faunistically with Europe 

 alone, but with the entire Eurasian continent from the Atlantic to 

 the Pacific, and it is probable that at least some six hundred species 

 are already known from those vast regions of the earth. In spite of 

 these formidable numbers, I feel certain that in both America and 

 Eurasia there are still hundreds of unknown forms to be announced 

 by future systematists. I can at present recall but very few species 

 common to the Atlantic and Pacific areas of North America, and 

 there are not many that can be considered as even subspecifically 

 related to one another. 



The genera of Bembidiinae, so far as concerns the American fauna, 

 may be defined as follows : 



Elytra with the sutural stria not recurved at tip, the scutellar stria pres- 

 ent except in Lymneops; size of the body much diversified 2 



Elytra with the sutural stria recurved at tip; scutellar stria wanting; 

 body always very small in size 6 



2 Eyes very large and prominent; outer maxillary lobe with the seg- 

 ments free 3 



Eyes small or wanting 4 



3 Elytra densely punctate, not striate Tachypus Dej. 



Elytra not diffusedly punctate, striate Bembidion Latr. 



4 Segments of the outer maxillary lobe anchylosed; habitus as in 

 Trechus Amerizus Chd. 



Segments free as in Bembidion 5 



5 Eyes wanting, sutural stria not attaining the apex, the scutellar ser- 

 ies feebly developed though traceable; body minute, rather narrow. 



Anillus Duval 



Eyes present; sutural stria entire, with a trace of apical recurvature, the 

 scutellar obsolete; eighth stria entire but broadly and feebly im- 

 pressed; body small in size, subparallel Lymneops n. gen. 



6 Eighth elytral stria coarse, deep, entire and foveate; each elytron 

 with six punctured discal striae, rarely abbreviated at tip; seventh 

 stria completely obsolete; mentum with two very large foramini- 

 form excavations; body convex, with more or less thick integument. 



Pericompsus Lee. 



