Remarks. — Ovigerous females have been taken 

 off Florida in March, South Carolina in July, 

 Surinam in August and September, and northeast 

 Brazil in November. 



Scyllarus americanus (Smith) 



Figure 75 



Arctus americanus Smith, 1869b, p. 119. 



Scyllarus americanus: Bouvier, 1925 (in part),, pp. 448-450. — 

 Holthuis, 1960b, p. 152 (restr.). 



Recognition characters. — Carapace with sur- 

 face squamose in part dorsally, a little squamose 

 below lateral borders posteriorly, lightly tuber- 

 culate toward epistome, with feathered setae 

 (some darkened) between squames; middorsal 

 ridge with anterior (pregastric) eminence large, 

 bilobed anteriorly, gastric eminence sharper and 

 more elevated, cardiac eminence not so sharp, bi- 



Figuw 7.",. Scyllarus americanus i Smith). Ovigerous 

 female in dorsal view, approximately x 1.5. Bob Simp- 

 son photo. 



lobed ; two coalesced blunt spines over each orbit 

 large and somewhat separated from ridges over 

 branchial areas. Rostrum short, rounded at tip, 

 a blunt keellike middorsal tubercle above. Ante- 

 rior border of carapace emarginate. Orbits deeply 

 excavated, margins broad, with a broad anterior 

 notch; a blunt tooth on proximal (fixed) antennal 

 article in center of notch. Anterolateral corners of 

 carapace spiniform, lateral borders roughened 

 with squames; a rather deep notch behind orbit 

 and another one farther back. Area between pos- 

 terior marginal groove and posterior margin of 

 carapace faintly squamose and traversed almost 

 always by a single distinct groove. 



Second antennular article elongate, flattened 

 above, anterior margin obliquely truncate. An- 

 tennae spatulate, somewhat punctate, surface 

 variably covered with feathered setae; distal arti- 

 cle with irregularly rounded anterior border cut 

 into six somewhat separated lobes, edges ciliated, 

 medial lobe short, spiniform, next much larger 

 and less pointed, following three about equal in 

 length, tips rounded, lateral lobe about twice 

 width of intermediate lobes; penultimate article 

 short, bilobed in dorsal view; proximal movable 

 article triangular in outline, edges spinose, two 

 lateral spines larger than four variably sized 

 medial spines, a prominent ridge running to 

 apical spine nearly dividing article in half. , 



Second, third, and fourth tergites of abdomen 

 (and to some extent first) with arborescent fur- 

 rows running inward and forward toward mid- 

 line. First to fourth segments with median notch 

 in posterior margin fairly deep and narrow; 

 fourth segment elevated, more or less ridgelike 

 in midline. Third to fifth pleura rounded distally, 

 sixth with a narrowly rounded anterolateral lobe. 

 Sternum triangular, broad at base; smooth witli 

 furrows ciliated; male with a low tubercle in 

 center of fifth sternite, female similar. 



Measurements. — Ovigerous female: length of 

 carapace, 25 mm., width, 29 mm.; length of 

 abdomen, 45 mm. 



Habitat. — Surface to 19 fathoms, usually 3 to 

 12 fathoms. 

 Type locality. — Edgmont Key, Fla. 

 Known range.— OR Bogue Inlet, N.C., to south- 

 ern Florida; Campeche Banks off Mexico. 



Remarks. — Ovigerous females have been taken 

 in southern Florida in September. 



96 



FISH AND WILDLIFE SERVICE 



