weymouthi Linder and Anderson was identical jections, but with a more or less conspicuous pair 



with Hymenopenaeus tropicalis (Bouvier). Com- of projections from lateral portions; ocular pe- 



parison of a number of specimens of both forms duncles with some inconspicuous vestiges of a 



leads me to regard them as identical. Prominence median tubercle. Proximomedian margin of an- 



of the coxal projections on the last three pairs of tennular peduncle produced as an elongate scale, 



legs in females varies with age. Those illustrated First chelipeds with tuft of setae on propodus in 



by Lindner and Anderson appear not so well de- both sexes. No podobranchs behind eighth somite 



veloped as in fully matured H. tropicalis females. (second maxillipeds). No epipodites behind 12th 



somite (3d legs) ; epipodites usually forked. No 



Subfamily Penaeinae filamentous anterior arthrobranch on 13th somite 



Carapace without post orbital spine; cervical (4th leg). Pleopods, except first pair, biramous. 



groove not extending to dorsum. Ocular somite Telson with well-developed terminal spine (Burk- 



without a greatly produced pair of median pro- enroad, 1934b). 



KEY TO GENERA AND SPECIES (PARTIAL) IN THE CAROLINAS 



a. Rostrum with ventral teeth Penaeus (p. 17). 



aa. Rostrum without ventral teeth, 

 b. Telson with subtenninal pair of fixed spines. 



c. Carapace with longitudinal and transverse sutures present; body nearly smooth 



Parapenaeus longirostris (p. 27). 



cc. Carapace without longitudinal and transverse sutures; body pubescent Penaeopsis goodei (p. 29). 



bb. Telson with no subterminal pair of fixed spines. 



c. Rostrum slender, sinuous, as long as or longer than carapace, with basal thin, high crest armed with five teeth 



plus an isolated epigastric tooth Xiphopenevs kroyeri (p. 30). 



cc. Rostrum not slender and sinuous, about half length of carapace, dorsal teeth evenly spaced 



Traeliypeneus eonstrietus (p. 31). 



KEYS TO SPECIES IN THE CAROLINAS 

 Genus Penaeus Fabricius, 1798 



Burkenrod, 1934b. — Hemming, 1958b. 



Adults 



( Based on keys by Anderson and Lindner, 1945, and Voss, 1955) 



a. Lateral rostral grooves not extending beyond base of rostrum . — setifcrim (p. 18). 



aa. Lateral rostral grooves reaching almost to posterior margin of carapace. 



b. Petasma of male with external edge of distoventral lobe armed with 2 to 12, usually 4 to 7. spinules; teeth of 

 internal edge of lobe long and sharp in close-set group of 6 to 16. Thelycum of female with anteromedian corners 

 of lateral plates moderately gaping, not covering carina of posteromedian part of median plate on 13th body 



somite (4th legs) duorarum (p. 21). 



bb. Petasma of male with external edge of distoventral lobe smooth, incurved, teeth of internal edge of lobe small, 

 in close-set group. Thelycum of female with anteromedian corners of lateral plates widely gaping, exposing forked 

 carina of posteromedian plate on 13th body somite (4th legs) aztccus (p. 24). 



JUVENILES BETWEEN 17 AND 47 MM. TOTAL LENGTH, LIVE OR FRESHLY PRESERVED 



(Williams, 1953) 

 a. Lateral rostral grooves not reaching almost to posterior margin of carapace ; rostrum prominent and slightly upturned 

 at tip in individuals above 22 mm. total length. Ground color light gray, sometimes with greenish cast in shrimp 

 taken from beds of vegetation; ehromatophores (widely spaced except on spines, ridges, and uropods) colored slate- 

 blue and brown; uropods with reddish-brown to brown areas distally setiferus (p. 18). 



aa. Lateral rostral grooves reaching almost to posterior margin of carapace (shallow in 17 mm. individuals). Color 

 gray to light brown, sometimes with greenish cast in shrimp taken from beds of vegetation ; ehromatophores numerous 

 and closely spaced, often in bands or patches. 



b. Rostrum usually not upturned at tip. ehromatophores slate-blue and brown ; usually with conspicuously pig- 

 mented lateral spot at juncture of third and fourth abdominal segments ; uropods with uniform sprinkling of 

 ehromatophores, degree of transparency uniform throughout (color more dense in older individuals) 



duorarum (p. 21). 



bb. Rostrum usually slightly upturned and attenuate at tip. ehromatophores brown and olive-green ; uropods' with 



reddish-brown to brown areas distally azteciis (p. 24). 



MARINE DECAPOD CRUSTACEANS OF THE CAROLINAS 17 



