Plate IV 



I. PUBESCENCE 



Adranes lecontei Brendel 

 Fig. 1. Abdominal trichome. 0.25 mm. 

 Fig. 2. Bifurcated seta from disk of elytron. 0.09 mm. 

 Fig. 3. Bifurcated seta from disk of elytron. 0.09 mm. 

 Fig. 4. Seta from apical margin of elytron. 0.072 mm. 

 Fig. 5. Elytral trichome. 0.198 mm. 



Pilopius lacustris Casey 

 Fig. 6. General integumental scale of body and legs. 0.03 mm. 

 Fig. 7. Scale with recurved tip, from posterior elytral margin. 0.07 mm. 

 Fig. 8. Spade scale found on posterior elytral margin, basal elytral foveae^ 

 sternal foveae and depressions, ventro-posterior area of head and 

 mesial faces of prothoracic coxae. 0.31 mm. 

 Fig. 9. Asperate scale. A form of scale which is set on an asperity found on 



ventral faces of prothoracic trochanter and femur. 0.041 mm. 

 Fig. 10. Umbrella seta, on processes of maxillary palpi. 0.072 mm. 

 Fig. 11. Type of very minute seta on segments of maxillary palpi. 0.009 mm. 



Tmesiphorus costalis LeConte 

 Fig. 12. Capitate seta on processes of maxillary palpi. 0.009 to 0.01 mm. 



Tychus minor LeConte 

 Fig. 13. Normal seta of eleventh antennal segment. 0.04 to 0.07 mm. 

 Fig. 14. Antennal cone of eleventh antennal segment. 0.54 to 0.72 mm. 



Rybaxis clavata Brendel 

 Fig. 15. Asperate setae from mesio-ventral face of eleventh antennal segment 



of male. 0.54 to 0.07 mm. 

 Fig. 16. Normal seta of antenna. 0.04 to 0.05 mm. 



Dalmosella tenuis Casey 

 Fig. 17. Distal cone on fourth segment of maxillar\" palpi. 0.009 to 0.01 mm. 

 Fig. 18. Antennal cone on eleventh segment of antenna. 0.01 to 0.04 mm. 



Melba thoracica (Brendel) 

 Fig. 19. Antennal cone on eleventh antennal segment. 0.04 to 0.05 mm. 

 Fig. 20. Normal seta of antenna. 0.01 mm. 

 Fig. 21. Capitulate seta of ventral area of head. 



II. MAXILLARY PALPI 



Fig. 22. Pilopius lacustris Casey. Note the remarkable development of umbrella 

 setae on the processes of segments II, III, IV. Slide mount, 450 

 diameters. 



Fig. 23. Pselaphus longiclavus LeConte. Fourth segment, lacking normal pu- 

 bescence in figure. 



Fig. 24. Pselaphus Justifer Casey. Fourth segment, lacking normal inibesccnce 

 in figure. 



Fig. 25. Pselaphus erichsonii LeConte. Fourth segment, lacking normal pubes- 

 cence in figure. Note distal groove at base of palpal cone. 



Fig. 26. Pselaphus bellax Casey. Fourth segment, lacking normal pubescence. 

 Note characteristic asperities of segment. 



Fig. 27. Ceophyllus monilis LeConte. 



Fig. 28. Cedius ziegleri LeConte. 



Fig. 29. Cercocerus batrisoides LeConte. Note that the palpal cone is set ob- 

 liquely within the apex of the fourth segment, and in a broad shallow 

 groove on the mesial face. This arrangement is rare among tem- 

 perate, but common in tropical tyrine pselaphids. 



Fig. 30. Tmesiphorus costalis LeConte. 



Fig. 31. Tychus minor LeConte. 



