88 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 



most significant indications of relationship. That is, they present 

 tangible differences between the various groups, while at the same 

 time they are of sufficient constancy throughout any one or more 

 groups to present an appearance of reliability. It is evident, however, 

 that only an examination of a very large proportion of the species of 

 the family can permit a dependable evaluation. The following are the 

 structural characters suggested : 



1. Condition of the coronal suture. 



2. Condition of the epicranial arm or frontal sutures. 



3. Condition of the clypeal area. 



4. Condition of the occipital suture. 



5. Position of the antennal fossae. 



6. Presence of ocelli. 



7. Absence of dorsal tentorial pits. 



8. Condition of the gular area. 



9. Segmentation of the antennae. 

 ID. Presence of processes on the labruni. 



11. Dentition of the mandibles. 



12. Condition of the prostheca. 



13. Presence of serial pores on the mandibles. 



14. Relative size and shape of the lacinia and galea of maxillae. 



15. Segmentation of the maxillary palpi. 



16. Size and shape of the terminal segments of the maxillary palpi. 



17. Shape of the submentum. 



18. Shape of the glossae and paraglossae. 



19. Segmentation of the labial palpi. 



20. Shape of the terminal segment of the labial palpi. 



21. Condition of postcoxal lobe of pronotum. 



22. Condition of the prosternal area. 



23. Enclosure of the front coxal cavities by various means. 



24. Condition of mesothoracic peritremes. 



25. Presence of corneous plates in the anterior foramen of prothorax. 



26. Separation of middle coxal cavities. 



27. Condition of elytral suture. 



28. Segmentation of the tarsi. 



29. Specially modified setae of the legs. 



30. Trochantero-femoral joint. 



31. Structure and position of the posterior coxae. 



32. Condition of second abdominal segment. ! 



33. Paratergites of abdomen. 



34. Mosaic patterns of intersegmental membranes of abdomen. 



35. Presence of gonapophyses in male genitalia. 



36. Condition of lateral plates in female genitalia. 

 27. Modifications of the aedeagus in the male. 



38. Condition of valvifers, coxites, paraprocts, and proctiger in the female 



genitalia. 



39. Modifications of the eighth segment in the female. 



40. Condition of the ninth and tenth segments in the female. 



