Plate I 



INTRAFAMILY VARIATION OF THE PSELAPHID AEDEAGUS 



a (accessory piece) ; ad (apical diaphragm) ; bb (basal bulb of median 

 lobe) ; bd (basal diaphragm) ; bm (bulbar muscles) ; 11 (lateral lobes) ; 

 ml (median lobe) ; vl (ventral lobe) ; pp (penial plate). 



Fig. I. A staphylinid aedeagus, Phloeocharis subtilissima Mann, subfamily 

 Oxytelinae, tribe Phloeocharini. Redrawn from Blackwelder, 1936. 

 Lateral view. Included for comparison ; see text. 



Fig. 2. Reichenbachia pluridentata Park. Lateral view. 



Fig. 3. Reichenbachia pluridentata Park. Dorsal view. 0.475 x 0.225 mm. 



Fig. 4. Pilopius piceus (LeConte). Lateral view. This and subsequent lateral 

 views have the morphological dorsal side uppermost, and the apical 

 (morphological posterior) end to the right. 



Fig. 5. Pilopius piceus (LeConte). Last sternite, with minute penial plate par- 

 tially exserted. 



Fig. 6. Pilopius piceus (LeConte). Aedeagus, dorsal view. 0.225 x 0.1 mm. 



Fig. 7. Pilopius piceus (LeConte). Apical view. 



Fig. 8. Cylindrarctus longipalpis (LeConte). Dorsal view. 0.389 x 0.201 mm. 

 Note penial plate exserted to right, the bilaterally symmetrical 

 bulbar muscles, and the ventral lobe. 



Fig. 9. Cylindrarctus americanu^ Schaufuss. Dorsal view similar save for dif- 

 ference in apical end of ventral lobe. 



Fig. 10. Cylindrarctus americanus Schaufuss. Lateral view. 



Fig. 11. Batrisodes furcatus (Brendel). Dorsal view. 0.28 x 0.08 mm. 



Fig. 12. Batrisodes riparius (Say). Dorsal view. 0.201 x 0.134 mm. 



Fig. 13. Batrisodes globosus (LeConte). Dorsal view. 0.233 x 0.133 mm. 



Fig. 14. Batrisodes globosus (LeConte). Lateral view. 



