228 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE XX. 

 ant., antenna; I. p., lateral process; t.g., tracheal gills; s., sucker. 



Blepharocera jordani, sp. nov. 



Fig. I. Larva, dorsal aspect. 

 Fig. 2. Larva, ventral aspect. 



Blepharocera osten-sackeni, sp. nov. 



Fig. 3. Larva, dorsal aspect. 

 Fig. 4. Larva, ventral aspect. 



Bibiocephala comstocki, sp. nov. 



Fig. 5. Larva, dorsal aspect. 

 Fig. 6. Larva, ventral aspect. 



Bibiocephala doanei Kellogg. 



Fig. 7. Larva, dorsal aspect. 

 Fig. 8. Larva, ventral aspect. 



Bibiocephala elegantulus von Roder. 



Fig. 9. Larva, dorsal aspect. 

 Fig. 10. Larva, ventral aspect. 



Fig. II. Larva from Colorado, unknown species; dorsal aspect. 

 Fig. 12. Larva from Colorado, unknown species; ventral aspect. 



