108 U.S. NATIONAL IMUSEUM BULLETIN 292 



are either brown and yellow or black and blue. The latter is described 

 below. 



Carapace generally bluish straw with blue-black to purple markings : 

 longitudinal stripe on lower half of rostrum; very short longitudinal 

 one extending from posterior to eye to level of third rostral tooth 

 from base; long longitudinal one extending posteroventrally from 

 orbit almost to level of posterior extremity of short stripe, there 

 turning gently posterodorsally and terminating short distance from 

 posterior margin of carapace; short vertical bar over hepatic spine 

 joining aforementioned long stripe to short arclike stripe extending 

 posteroventrally from base of antenna between antennal and hepatic 

 spines; posterior portion of long stripe with one or two branches 

 extending anterodorsally and one anteroventraUy ; branchial region 

 with two subparallel, almost horizontal, stripes; large spot on antero- 

 lateral surface at base of antenna with submarginal stripe extending 

 posteriorly to level behind coxa of fifth pereiopod; posterior margin 

 of carapace with narrow transverse band. (Latter band with those 

 on abdomen constituting conspicuous banded elements in this shrimp) . 

 First abdominal somite margined in black with bands on tergum 

 much broader than black rim on pleuron, remainder bluish gray. 

 Second abdominal somite with bluish-black band on free margins 

 of pleuron and posterior border of tergum ; remainder of somite bluish 

 gray with pair of pale yellow spots adjacent to ventral marginal 

 bluish-black edging. Third abdominal somite with broad, royal blue 

 band anteriorly and narrow bluish-black band posteriorly, separated 

 by broad bright yellow one; ventral margin of pleuron with bluish- 

 black border. Tergum of fourth and fifth somites with narrow rust- 

 colored bands across posterior margins between articular knobs; 

 ventral borders of pleura with narrow bluish-black bands. Sixth 

 abdominal tergum with narrow transverse, rust-colored band just 

 anterior to midlength; similarly colored spot at base of uropod and 

 another laterally at posterior margin. Telson bluish gray with dark 

 spines and dark terminal setae. Uropods translucent, especially 

 lateral ramus, with greenish-blue areas highly variable in shape; 

 distal portion of inner ramus usually with light translucent area. 



Peduncle of antennules purplish, inner flagellum dark blue, lateral 

 one paler. Antenna with dark spots on basal segment; antennal scale 

 with longitudinal stripe laterally and along lateral portion of lamella; 

 flagellum pale bluish straw. Fhst pereiopod translucent blue with 

 dark blue band at distal end of merus, carpus, and at base of fingers. 

 Basal segment of second pereiopod pale bluish lavender; merus 

 through palmar area of propodus olive green with dark purple tuber- 

 cles and golden setal clusters; fingers dark blue with pale tan tips. 

 Third, fourth, and fifth pereiopods pale bluish lavender with pink 



