EXPLANATION OF PLATES. 



Plate 1. 



Family Mengeidae (males). 



Page. 



Fig. 1 . Mengea tertiaria, antenna 84 



2. Trioxocera mexicana, wing 86 



3. Trioxocera mexicana, thorax, dorsal view 86 



4. Trioxocera mexicana, cedeagus, part lateral view 86 



Family Myrmecolacid^e (males). 



5. Myrmecolax nietneri, wing (after Saunders) 88 



6. Myrmecolax nietneri, antenna (after Westwood) 88 



7. Caenocholux fenyesi, wing 89 



8. Caenocholax fenyesi, thorax, dorsal view 89 



9. Caenocholax fenyesi, face, ventral view 89 



10. Caenocholax fenyesi, cedeagus, lateral view 89 



11. Caenocholax fenyesi, tenth abdominal segment, dorsal 89 



Drawings by the author. 



Plate 2. 

 Family Stylopid^e (males). 



Fig. 1. Parastylops flagellatus, wing (after Meijere) Ill 



2. Parastylops flagellatus, antenna (after Meijere) Ill 



3. Parastylops flagellatus, metathorax, dorsal view (after Meijere) Ill 



4. Stylops melittse, wing (after Saunders) 94 



5. Stylops crawfordi, thorax, dorsal view 100 



6. Stylops crawfordi, apex of abdomen, lateral view 100 



7. Stylops solidulse, cedeagus, lateral view 107 



8. Stylops crawfordi, left mandible, lateral view 100 



9. Stylops crawfordi, right mandible, ventral view 100 



10. Stylops crawfordi, left mandible, ventral view 100 



11. Stylops crawfordi, maxilla, lateral view 100 



12. Stylops crawfordi, front view of cephalotheca of puparium 100 



13. Stylops solidulse, front view of cephalotheca of puparium 107 



Drawings by the author. 



Plate 3. 

 Family Stylopid^e (females). 



Fig. 1. Stylops advarians, cephalothorax 97 



2. Stylops bruneri, cephalothorax 98 



3. Stylops claytonix, cephalothorax 99 



4. Stylops cornii, cephalothorax 100 



5. Stylops crawfordi, cephalothorax 100 



6. Stylops cressoni, cephalothorax, containing triungulinids 102 



7. Stylops grsenicheri, cephalothorax 103 



8. Sty'ops hartfordensis, cephalothorax 103 



9. Stylops hippotes, cephalothorax 103 



10. Stylops imitatrix, cephalothorax 104 



11. Stylops multiplicatse, cephalothorax 104 



Illustrations from photomicrographs made by H. S. Barber and E. S. 



Tucker, and the author and retouched by the latter. 



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