210 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



CALAPPA ANGUSTA A. Milne Edwards 



Plate 64, Figures 1-6 



Calappa angusta A. Milne Edwards, Bull. Mus. Comp. Zool., vol. 8, no. 1, p. 18, 

 1880 (type locality, Barbados, 100 fathoms, teste Bouvier, 1902; type in 

 M. C. Z., no. 6653). — A. Milne Edwards and Bouvier, Mem. Mus. Comp. 

 Zool., vol. 27, no. 1, p. 123, pi. 24, figs. 5-8; pi. 25, figs. 1-3, 1902.— Hay and 

 Shore, Bull. U. S. Bur. Fisheries, vol. 35 (1915-16), p. 421 (not pi. 31, fig. 7, 

 1918, a young ^ammea). 



Calappa saussurei tortugae Rathbun, Proc. Biol. Soc. Washington, vol. 46, 

 p. 183, 1933 (type locality, Tortugas; type, U. S. N. M. no. 66382). 



The word "angusta" is suited to the young of this species for which 

 it was named by A. Milne Edwards, the posterior part being narrower 

 than the middle. The adults, however, are of good size and are 

 widest behind, as in other American species. 



Diagnosis. — Compared to C saussurei, the adult carapace is wider 

 across the middle. Tubercles low, arcuate, not acute; less prominent 

 in posterior portion of carapace. Posterolateral wings less elevated. 

 Tubercles less prominent on manus and smaller on lower half. 



Description. — Anterolateral margins finely granulate, with slightly 

 larger granules at intervals. Front seen from above bilobed, each 

 lobe with a sinuous margin which is also the margin of the antennular 

 cavity. Inner superior border of orbit much swollen. Both margins 

 of lateral expansion sUghtly concave; tooth at posterolateral angle 

 much the largest, followed anteriorly by four small teeth gradually 

 diminishing in size and posteriorly by one small and one or two minute 

 teeth; tooth at either end of posterior margin obtuse-angled, raised, and 

 thickened. Surface covered with protuberances, granulate between 

 the tubercles. Orbit completely separated from antennular cavity. 

 Manus with coarse granules interspersed with tubercles which form 

 three irregular oblique rows, subparallel to proximal end of palm, 

 and a row of five close to the superior row of eight marginal teeth. 

 Abdomen with sixth segment subquadrate, terminal segment sub- 

 triangular, slightly longer than wide, tip blunt in the full grown. 



Color (66381). — General ground color buff to buff-yellow; high spots 

 or lumps on carapace brick red, on chelipeds blood red. Marginal 

 spines of carapace, crest of chela and lumps on crest ground color. 

 Hairs of carapace, especially those of hind margin, a sort of light oHve- 

 yellow; those of ambulatory legs light citrous yellow. Merus of 

 chelipeds practically colorless. Under parts whitish, pterygostomian 

 region and maxillipeds suffused with pale rose purple. (W. L. 

 Schmitt.) 



Measurements. — Male (51070), length of carapace 16.7, greatest 

 width 18.7, width at posterior angles 17 mm. Male (66382), length 



