DECAPOD CRUSTACEANS OF THE WEST INDIES 103 



end of antennular peduncle, dorsal margin faintly convex, tip not 

 upturned; armed mth 13 to 15 small rather regularly spaced dorsal 

 and 2 or 3 ventral teeth; posterior 5 or 6 teeth of dorsal series placed 

 on carapace behind level of orbital margin. Eyes large, cornea well 

 pigmented. Second pereiopods of adult male very dissimilar and 

 unequal; major cheliped with fingers slightly longer than palm, 

 widely gaping, with one large tooth on proximal part of opposable 

 margin of each finger, each finger bearing several longitudinal rows 

 of small spinules on exterior surfaces and long, stiff hairs along cutting 

 edges; palm strongly compressed, about two or two and one-half 

 times as long as wide, armed with longitudinal rows of spines, those 

 on mesial margin forming spiny crest continued in reduced form on 



Figure 23. — Macrobrachium faustinum, male (carapace length 18.2 mm) from Dominica 



station 24. 



fixed finger and reduced also near midlength, becoming strong in proximal 

 and distal parts oj palm, all spines on lateral and inner surfaces almost 

 completely concealed by dense, soft fur; carpus usually as long as or 

 slightly longer than palm and distinctly longer than merus. Third 

 pereiopod with propodus two and one-half to three times as long as 

 dactyl. Color pattern usually characterized by light transverse patch 

 on posterior part of third abdominal tergum; fingers of second perei- 

 opod and distal podomeres of third to fifth pereiopods often con- 

 spicuously banded; second pereiopod light colored, except for bands 

 on fingers. A medium-sized species, maximum postorbital carapace 

 length about 18 mm. 



Color in life. — Body of male almost translucent with pale 

 yellowish or pinkish suffusion produced by widely scattered orange-red 

 ckromatophores. Rostrum with reddish-brown stripe along lower 

 basal half extending ventrolaterally along margin of orbit almost 



