DECAPOD CRUSTACEANS OF THE WEST INDIES 



107 



Palaemon Appuni Von Martens, 1869, p. 31, pi. 2: fig. 5 [type-locality: Puerto 



Cabello, Venezuela]. 

 Palaemon heterocheirus. — Kingsley, 1878a, p. 68. 

 Bithynis appuni? — Pocock, 1889, p. 10, pi. 2: fig. 2. 

 Macrobrachium heterochincs. — Holthuis, 1950b, p. 14; 1952, p. 69, pi. 15: figs, a, 



b; pi. 16: figs. a-c. 



Diagnosis. — Carapace wdth antennal and hepatic spines, without 

 branchiostegal spine. Rostrum reaching anteriorly nearly or just as 

 far as end of antennular peduncle, dorsal margin sinuous, tip slightly 

 upturned; armed with 10 to 13 dorsal and 2 to 4 ventral teeth; pos- 

 terior 4 to 6 teeth of dorsal series placed on carapace behind level 

 of orbital margin, posterior 3 or 4 more erect and more widely spaced 





Figure 24. — Macrobrachium heterochirus, male (carapace length 31.9 mm) from Dominica 



station 47. 



than others. Eyes large, cornea well pigmented. Second pereiopods 

 of adult male similar in form but unequal in length; fingers about 

 two-thirds as long as palm, meeting throughout their length, without 

 noticeably large teeth on opposable margins, each finger bearing 

 numerous scattered spinules on exterior surface and short pubescence 

 along cutting edge; palm only slightly compressed, three or more 

 times as long as wide, provided with scattered spinules protruding 

 from short pubescence, but without spiny crest along margin con- 

 tinuing from fixed finger; carpus about three-fourths as long as palm 

 and as long as or longer than merus. Third pereiopod with propodus 

 two to three times as long as dactyl. Color pattern characterized by 

 dark transverse bands on abdominal tergites and dark borders on 

 pleura. A medium-sized species, maximum postorbital carapace length 

 about 34 mm. 



Color in life. — Macrobrachium heterochirus is the most strikingly 

 transversely banded shrimp on Dominica. Like all Macrobrachium 

 and like most of the freshwater shrimps, the basic colors of this species 



317-180 — 69 9 



