Puate IV 
Fig. 1. Macrobrachium luje (de Man), from Aba. Male 71.3 mm. long, cara- 
pace and rostrum 34.6. 
Fig. 2. Macrobrachium dux (Lenz), from Niapu. Most fuwly developed of four 
males, carapace and rostrum 54.5 mm. long. 
