206 NORTH AMERICAN COLEOPTERA. 



Fig. 7. Labrum of Stenus juno O viewed on its under surface ; it is most 

 strongly impressed in the middle and near the posterior sinuosity ; 

 the structure is cellular, especially near the lateral posterior 

 angles. The slight bilobation observed in the anterior edge is 

 not to be seen distinctly when viewed in its natural position. 



Fig. 8. Antenna of S. sculptilis. 



Fig. 9. Antenna of S. (Mutinus) dispar. 



Fig. 10. Tarsal claw of Areus pollens. 



Fig. 11. Tarsal claw of A. reconditus. 



Fig. 12. Tarsal claw of A. propinquus. 



Fig. 13. Tarsal claw of A. canadensis. 



Fig. 14. Tarsal claw of A. pinguis. 



Fig. 15. Tarsal claw of A. utenis. 



Fig. 16. Tarsal claw of A. trajectus. 



Fig. 17. Tarsal claw of A. papagonis. 



Fig. 18. Tarsal claw of A. tarsalis Ljungh, taken from a European specimen. 



Published, November, 1884. 



Philadelphia : 

 Collins Printing House, 

 705 Jayue Street. 



