100 



U.S. NATIONAL MUSEUM BULLETIN 292 



Dorsum of carapace generally darker than branchial area, and Math 

 lighter area just posterior to hepatic spine; antero ventral portion of 

 branchial area mth submarginal reddish-black stripe. Terga of first 

 and second abdominal somites reddish black dorsally fading to purplish 

 red, and both provided with lighter purplish-red spots lateral to median 

 line. Tergum of third abdominal somite as dark as those anterior to 

 it but with broad subrectangular yellow area in posterior half. Fourth 

 and fifth terga purplish red, each with narrow yellow transverse band 

 flecked with red near posterior margins. Sixth tergum purplish red. 

 All pleura purplish red but progressively darker posteriorly. Articular 

 knobs at bases of pleura ringed in black. Telson scarlet with darker 

 red patches and black rings around bases of spines. Uropods variable 



Figure 22, — Macrobrachium crenulatum, male (carapace length 24.0 mm) from Dominica 



station 22. 



but lateral margin of lateral ramus and laterodistal part of mesial 

 ramus sulfur yellow; remainder of both scarlet with darker red blotches, 

 Eyestalks purple with cornea almost black, Antennules purplish 

 basally; inner flagellum dark tan and outer two pale tan, Antennal 

 peduncle lavender red, antennal scale with dark lateral margin and 

 purplish lamella, and flageUum pale tan. First pereiopod dark grayish 

 blue except for chela, latter creamy translucent with dark blue stripe 

 along palm and dark band across fingers. Second pereiopod with gray 

 coxa and pinkish basis and ischium; distal podomeres black with white 

 translucent tubercles; base of dactyl orange, tips of both fingers white. 

 Coxa of walking legs gray, remaining podomeres red except for pale 

 pinkish distal extremities of i)ropodus and proximal extremities of 

 merus and dactyl. Pleopods red with bluish setae; distolateral angles 

 of protopodites of posterior three pairs with sulfur yeUow spot. 



