PLATE IV. 



All the figures are by J. Henry Blake. Unless otherwise specified all the specimens drawn 

 come from Florissant, Colorado. 



Page. 



Fig. 1. (6622) (W- 



2. (5984) ( i 



3. (! 



4. (1906) ( f 



5. (¥ 



6. (8316) (Y- 



7. (1.829) (-w- 



8. (8789) (-V- 



128 



. Stenolophus religatus 35 



. Nothopus kingii 34 



. Dytiscidfe sp., perhaps a Matus; metasternuni. Hadley, Massachusetts... 37 



. Agabus rathbuni : 37 



. A portion of the surface of fig. 3 still further enlarged. Hadley, Massa- 

 chusetts : , 37 



. Brachynus repressus; elytron _ 33 



) . Harpalus whitfieldii - 35 



. Brachynus newberryi 32 



