PLATE VI. 



PAGE 



Diastylis stygia, Gr. 0. Sars, . . .44 



Fig. 1. Female, seen from the right side ; magnified about nine diameters. 



Fig. 2. Same, seen from above. 



Fig. 3. Adult male, viewed from the left side ; magnified about nine diameters. 



Fig. 4. Same, seen from above. 



Fig. 5. Antennal segment of a female specimen, together with antermuhe (a 1 ), 

 antennae (a 2 ), and anterior lip (L), seen from below. 



Fig. 6. Mandibles, together with adductor and rotatory muscles, seen from pos- 

 terior side. 



Fig. 7. Posterior lip. 



Fig. 8. Maxilla of first pair. 



Fig. 9. Maxilla of second pair. 



