26 PROC. ENT. SOC. WASH., VOL. 24, NO. 1, JAN., 1922 



Stp the true stipes according to Dr. Crampton; the "subgalea" of 



coleopterists. 



Sty stylus of genital valve of ovipositor. 



T tergite of abdomen, numbered to indicate the segment to which 



it belongs. 

 Ur9 ninth segment of abdomen, forming in the female Melanotus, the 



sheath of the ovipositor, and not differentiated into tergite, 



sternite or pleurites. 

 WP wing process, 



ac anterior condyle of mandible. 



car carina. 







ep epipharynx. 



epm epimeron (2, of mesothorax; 3, of metathorax). 



eps episternum (2, of mesothorax; 3, of metathorax). 



fix flexor muscle. 



gul sut gular suture. 



hyp hypopharynx. 



mt sut mental suture. 



mo median orifice of median lobe of aedeagus. 



plfr palpifer. 



plgr palpiger. 



pip palpus. 



pc posterior condyle of mandible. 



prs prostheca. 



psc prescutum. 



rtr retractor muscle. 



scl scutellum. 



set scutum. 



sul sulcus. 



EXPLANATION OF PLATES. 



PLATE 5. 



1. Head of Melanotus fissilis Say, in dorsal aspect. 



2. -Ventral view of head and mouthparts; M. fissilis Say. 



3. Lateral view of head and part of prothorax; Melanotus sp. 



4. Lateral view of head and part of prothorax; M. fissilis Say. 



5. Frontal and slightly ventral view of head and prothorax; M. fissilis Say. 



6. External view of labrum, with edge of epipharynx visible; M. fissilis Say. 



7. External (superior) view of right mandible; M. communis Gyll. 



8. Lateral view of right mandible; M. communis Gyll. 



9. External view of labium; M. fissilis Say. 



10. Buccal aspect of labium; M. communis Gyll. 



11. Left maxilla; M. fissilis Say. 



12. First four antennal joints of M. fissilis Say, male and female, showing erect 



pubescence on 4th joint of male. 



13. Head and prothorax in dorsal aspect; M. communis Gyll. 



14. Meso- and metathorax, dorsal view; M. communis Gyll. 



15. Posterior view of prothorax; M. communis Gyll. 



