300 



BULLETIN OF THE BUREAU OF FISHERIES. 



Fig. 75.— Dorsal view of the head of Acilius semisulcatus, showiag the color pattern. Fig. 76.— Maxilla, dorsal view. Fig. 77.— 

 Labium, ventral view. Fig, 78.— Labium, dorsal view. Fig. 79.— Dorsal view of larva of Hydroporus niger. Fig. 80.— 

 Frontal margin of proboscis, ventral view. Fig. 81.— Side view of head. Fig. 82.— Mandible. Fig. 83.— Maxillae and 

 labium, ventral view. 



